28. Hence, Cu is the least reactive metal among the given four metals. > The order of the metals in the reactivity series can be worked out by using these type of reactions. 3. solution, the time required for the colour of the solution to change from blue to green will be less if: Question 5: Question 14: You are given two test tubes A and B, with solutions ZnS04 and A12(S04)3, both are colourless. Conclusion: Al, Zn and Fe metals are more reactive than Cu. > Reaction with Al2(SO4)3 solution: Four students A, B, C and D noted the initial colour of the solutions in test tubes I. II, III and IV. > A more reactive metal will always displace a less reactive metal. 30. Which one of the two metals is more reactive? Answer: Cu is unable to displace any metal among Al, Fe and Zn from their salt solutions, therefore Cu is least reactive. If the temperature of water, the amount of metal and the amount of water is kept constant, the rate of reactivity can be calculated. It is used to summarize information about the reactions of metals with acids and water, single displacement reactions and the extraction of metals from their ores When a more reactive metal displaces the less reactive metal from its salt solution, it is called displacement reaction. Hence, it is more reactive than copper metal. (i) Salt solution CuSO4. When a gas is formed in a reaction, it releases bubbles. This is a lesson investigating the reactivity of 4 metals. Answer: Add a small strip of Al foil to each of the test tubes. 6. Question 8: 4. 14. Hence, displacement reaction will occur. Students work in In reactivity series, the most reactive metal (K) is placed at the top of the series while the least reactive metal (Au) is placed at the bottom. Other metals displace less reactive metals in a similar manner. Use very small pieces of metal every time. Question 7: The decreasing order of reactivity for these metals follow the order: Observe the changes carefully as few reactions may occur slowly. The colour of the solution and that of the coating would respectively be These displacement reactions are used to establish an order of reactivity down Group 17 of the periodic table. Black residue would be obtained in test tubes: Here, in the above reaction it is S042- ion. Questions based on Reporting and Interpretation Skills, 28. 2:15 understand how metals can be arranged in a reactivity series based on their reactions with: water and dilute hydrochloric or sulfuric acid Each group recorded the observations as [ given below in the table. Take four test tubes and label them as ZnSO. A compound will always displace a less reactive metal from solutions of its compounds. Wash the test tubes after every set of observations of interaction of a particular metal with the four salt solution. (a) Al + ZnSO4 What happens when Fe (Iron) metal is added to blue colour copper sulphate solution? 17. The metal that will displace two metal ions from the salt solutions will be the most reactive and the one which will not show any colour change in the solutions is the least reactive. In this classic experiment, from the Royal Society of Chemistry, students initially observe aluminium not reacting with copper sulphate due to the oxide layer on the surface of the aluminium. It is also known as the activity series. These metals cannot displace hydrogen from acids and water.You can also download. Question 1: (a) Copper is less reactive than zinc. (d) Iron is less reactive than Zn. But, in anhydrous copper sulphate the water molecules are not present. Aim in water, the colour of the solution obtained would be: You would observe the deposition of metal on zinc in test tubes 3. Hence, Al metal is the most reactive metal among the given metals. 4. 7. Al > Zn > Fe > Cu. What is your observation when copper is added in iron (II) sulphate solution? Due to the displacement reaction the blue colour of copper sulphate changes to green colour of iron sulphate. > Copper (II) sulphate is blue in colour. 1. A black residue was obtained in two of them. A few pieces of iron filings were then added to both the solutions. Chlorine is more reactive than iodine and hence it displaces iodide ion. (a) light green to blue As you can see these metals (excluding carbon, as carbon is used for the reduction of metal from metal oxide ore, all metals below carbon are reduced by it) are above hydrogen in the reactivity series so they react with acids and displace hydrogen gas. The iron nail reacts with copper sulphate displace copper and form iron sulphate . Your email address will not be published. This is the displacement reaction seen among halogens. Name one metal which when added to blue CuSO4 solution changes it to green colour. Sourabh Das 25/01/2014 Reactivity Series Experiment Pre-Lab Answers: 1. Reactivity Series, Redox Reactions and Extraction of Metals. Log in. The most reactive element is placed at the top and the least reactive at the bottom. Fe readily loses electrons as compared to copper. Displacement reactions Look at the reaction below: /**/ Here, we witness iron and copper competing to be compounds in solution. (Hint: Look at the dehydration reaction of copper sulphate) To determine the position of Element X in the reactivity series. Two beakers A and B contain Iron (II) sulphate solution. (d) Iron spoon will not show any change. (c) The final solution becomes light green. > Metal salts are coloured Al > Zn > Fe > Cu. 15. (a) yellow and green Question 6: (a) II, III (b) I, III (a) Zinc sulphate will become green. III. II. (d) add dilute nitric acid on both the strips. They recorded their observations in the form of table given below: Which student noted the colour change in all the four test tubes correctly? (d) copper sulphate solution only changed. (d) Cu is the least reactive metal and can be displaced by all the metals given. 17. Question 3: 5. What is the colour of Al2(SO4)3 solution? Reactivity Series Of Metals Class 10 Introduction After some time, on observation, it was found that the colour of the solution has changed from BX is a salt of metal B. Watch out for the latest updates on NCERT Books, NCERT Solutions, CBSE Sample Papers, RS Aggarwal Solutions and all resources that we share regularly on CBSETuts.com for K12 Students. Answer: 27. 1. (d) the colour of the strip changed. Hence, the reactivity order is Al > Zn. > Speed of reaction: We can calculate the speed of reaction of metals by allowing them to react with water at room temperature and collect the hydrogen gas obtained. (c) it is kept undisturbed Aluminium sulphate and copper sulphate solutions were taken in two test tubes I and II respectively. 23. Do not touch any chemical. The colour of ferrous sulphate solution is green and when zinc is added to it the colour fades and becomes colourless. Take four clean test tubes, labelled as A, B, C, and D. 24. Mar 26, 2020 - Explore Arif's board "reactivity series" on Pinterest. Answer: The right pair of metals forming the precipitates is (b) Copper salt is blue in colour and aluminium salts are colourless. Question 11: (b) the lower end of the test tube becomes slightly warm. It is used to determine the products of single displacement reactions, whereby metal A will replace another metal B in a solution if A is higher in the series. There is an interactive version to use with the class. Question 3: (d) A brown mass is deposited on the surface of aluminium. (b) Zinc is most active metal followed by copper and then iron. Metals can be arranged on the basis of relative reactivity. (a) Test tube with CuSO4 solution Dip a small, clean piece of aluminium, zinc, iron and copper metals in test tubes A, B, C and D respectively. Answer: Chlorine is toxic [1]. In a more vigorous reaction, … (a) A (b) B (c) C (d) D. 32. To observe the action of Zn, Fe, Cu and Al metals on the following salt solutions: Arrange Zn, Fe, Cu and A1 metals in the decreasing order of reactivity based on the above result. (b) green 14. Question 12: The water is therefore the oxidising agent. If the atom readily loses electron at room temperature it is said to be reactive metal than the metal whose atom does not readily lose electron at the room temperature. 24. Arrange the given metals in the reactivity series: 4. Therefore, these metals can displace hydrogen from its compounds like acids and water. (d) R displaces Q. Activity series of some of the more common metals, listed in descending order of reactivity. (b) It shows thermite reaction and heat is evolved. 7. After inserting (b) brown and blue Watch this video to show you how to work out the reactivity Series of the metals. (a) add Zn in test tube A and B 23. On heating copper sulphate crystals the blue colour of copper slowly changes to light blue and then colourless. (c) yellow The students have to then write their investigation up - including their equipment list, method and analysis of results. (b) blue to colourless The reactivity series is also known as the activity series of metals. 2Na (s) + 2H 2 O (l) ==> 2NaOH (aq) + H2 (g) You can write similar equation for lithium and potassium (Li/K instead of Na) and. In one molecule of copper sulphate, five water molecules are present to form crystal. For any questions pertaining to CBSE Class 10 Science Practicals Reactivity Series Material, feel free to leave queries in the comments section. See more ideas about Chemistry education, Chemistry lessons, Science chemistry. (c) Increase in temperature speeds up the reaction. (c) blue (d) brown. Tie-ins include single-replacement reactions (SRR), oxidation-reduction, practical applications such as galvanization, and predicting reactions. Question 9: (b) R is removed from the compound and exists freely. 1. A student took four test tubes containing solutions of different colours marked I, II, III, and IV as shown below. The most reactive metal displaces the less reactive metal from its salt solution. Overview: The students will develop their own activity series of metals based on lab results. Name the least reactive metal among the following: Fe, Zn, Al. Add ZnSO4 solution in each test tube. After a few minutes, it would be observed that the colour of Thus, zinc is more reactive followed by iron and copper. Students add each metal to acid and record observations as to whether they react. (c) Iron spoon will get holes in it. Answer: 9. reactivity series during these experiments. Which of the following reaction will take place? (a) Fe displaces copper ions. Name some metals that will react with aluminium sulphate solution, i.e., Al2(SO4)3. (a) This will show displacement reaction. It is useful to place carbon and hydrogen into the reactivity series because these Question 6: > A more reactive metal will displace (take the place of) a less reactive metal in a metal salt solution. Answer: When a few crystals of copper sulphate are dissolved Answer: (c) a colourless gas with a smell of burning sulphur is observed. > The arrangement of metals in decreasing order of their reactivity is called reactivity series or activity series of metals. (a) copper and zinc Record your observations. Note Making Class 11 CBSE Format, Examples, Unseen Passage For Class 11 Literary CBSE With Answers, Unseen Passage for Class 11 Discursive CBSE with Answers, Unseen Passage for Class 11 Factual CBSE With Answers, Rearrange Jumbled Sentences for Class 11 CBSE with Answers, Error Correction Exercises for Class 11 CBSE with Answers, Sentence Transformation Exercises for Class 11 CBSE with Answers, Editing Exercises for Class 11 CBSE with Answers, Active and Passive Voice Exercises for Class 11 with Answers CBSE, Tenses Exercises for Class 11 CBSE With Answers. Zinc granules were added to zinc sulphate, copper sulphate, aluminium sulphate and iron sulphate solutions as shown below. 2. Developing the Activity Series. Answer: 16. Iron spoon was placed in a glass container holding zinc sulphate solution. 2. The elements at the top can displace elements below them from their compounds. The test tubes containing copper sulphate solution and ferrous sulphate solution could be the tubes: 31. (c) As per reactivity series. (c) Cu + ZnSO4 (i) To observe the action of Zn, Fe, Cu and Al metals on the following salt solutions: (c) heat zinc and copper strips. (a) all the four solutions changed. 2I– (aq) + Cl2 (aq) —> 2l– (aq) + I2 (solvated) (b) R is displaced by P Question 4: 3. It is because Fe does not react with FeSO4 solution. 29. (c) red and greenish-blue 10. (d) Heat increases the rate of reaction. 11. Iron filings were added to an aqueous solution of copper sulphate. Question 5: (d) zinc and aluminium. Building the reactivity series During a reaction, metals lose electrons to form positive ions. (b) blue to colourless Why displacement reaction? The colour of iron sulphate solution is green. When an aluminium strip is kept immersed in freshly prepared ferrous sulphate solution taken in a test tube, the change observed is Practical Based Questions PBQs based on every experiment with their answers, covering Previous Years’ Questions, are provided experiments for complete coverage of concepts Web support By performing the experiments, students will know the concept in a better way as they can now view the changes happening in front of their eyes. (b) The final solution becomes colourless. (a) yellow and Zn (b) green and Fe (c) red and Sn (d) blue and Ag. 6. (c) I and II (d) III and IV. Metal Displacement Reactions (c) Iron is most active metal followed by zinc and then copper. Qualitative observations will be used. > Metals: The atoms of metal will always lose electrons to form positive ions called cations. When you keep aluminium strip in FeSO4 solution, what change is seen? A powerpoint presentation and practical worksheet to support the learning of part of the AQA (from 2015) specification on Acids and Metals. 26. Iron wins as it displaces copper from copper sulphate solution. BASIC BUILDING CONCEPTS. What will happen if Fe metal is added to ZnSO4 solution? (d) colourless. > Reaction of Metals with Salt Solution A piece of granulated zinc was dropped into copper sulphate solution. It can be done as a demonstration or as a class experiment. Aim To observe the action of Zn, Fe, Cu and Al metals on the following salt solutions: ZnSO 4 (aq), FeSO 4 (aq), CuSO 4 (aq), Al 2 (SO 4) 3 (aq) To arrange Zn, Fe, Cu and Al metals in the decreasing order of reactivity based on the above results. The reactivity series of metals is Dip small, clean pieces of Al, Zn, Fe and Cu metal in test tube A, B, C and D respectively. (b) zinc and tin The reactivity series is the arrangement of elements according to their reactivity. Question 1: 1. Observe the changes and record your observations. Zinc is more reactive than copper and displaces copper from its solution. > Non-Metals: The atoms of non-metals gains or shares electrons to form negative ions called anions, the atoms of non-metals if readily gains electrons it is said to be more reactive. Practical applications of the series are prediction of double displacement reactions involving two metals and the extraction of metals from their ores. The colour of the coating obtained on a zinc rod on dipping in aqueous copper sulphate solution will be ACTIVITY SERIES LAB (MICROSCALE) Purpose: to study the chemical activity of ... the six reagents you will be using in this part of the experiment: KNO 3, Mg(NO 3) 2, Zn(NO 3) 2, CuSO 4, AgNO 3, and distilled water. (c) I, II, III (d) II, III, IV. (c) Cu is less reactive than Zn. 31. In the following reaction, A and B are metals. > For example, in a given chemical reaction: (c) CuSO4 (aq.) Answer: Answer: 8. (b) Zn + ZnSO4 CBSE Class 10 Science Practical Skills – Reactivity Series. Which of the following reaction will not occur? Name any two metals that are more reactive than iron. sodium + water ==> sodium hydroxide + hydrogen. A student took Cu, Fe, Zn and Al strips separately in four test tubes labelled I, II, III and IV respectively. (c) the copper strip became thicker The blue colour of the crystals is due to these five water molecules. (d) zinc and aluminium. Strips of copper, iron, zinc and aluminium were introduced, each metal in a different test tube. Students will investigate competition reactions of metals and determine a reactivity series of the four metals used. Add Al2(SO4)3 solution in each test tube. Copper is less reactive than iron and cannot react with iron sulphate. The arrangement of metals in a vertical column in order of their decreasing reactivity downwards is called the reactivity series of metals. Take FeSO4 (aq) solution in each test tube. (a) Copper does not react, but zinc reacts with ferrous sulphate solution. Some: Sodium: Na: Light: Lithium: Li: Color How would you devise the procedure to show that Mg > Fe > Cu in reactivity series? Metals which lie above hydrogen in reactivity series are more reactive than hydrogen. What is the colour of copper sulphate solution? (a) A (b) B (c) C (d) D. 1. ZnSO4 solution in each test tube. Question 10: Metals like calcium, sodium and magnesium will react with aluminium sulphate solution. A more reactive metal will displace a less reactive metal from solution. > To arrange the metals in the increasing or decreasing order of their reactivity one of the commonly used experiment is by checking their displacement rate. Why did the colour of copper (II) sulphate solution, change, when zinc metal was dipped in it? I. CuSO4 solution in each test tube. When iron nail is dipped in this solution, reaction takes place and blue colour disappears and turns greenish and the iron metal gets coated with pink-brown copper metal. > If a less reactive metal is added to a more reactive metal salt solution then there will be no reaction. Why? (c) Aluminium salt is colourless and not green in colour. The water loses oxygen (is reduced). Answer: Students should learn about the reactions of metals and are expected to be able to place metals in order of reactivity based on simple experiments such as the reactions of metals with water and acids and also displacement reactions between metals and solutions containing the ions of other metals. (b) Cu + FeSO4 > The atoms of the elements in the periodic table react with each other to form new compounds (except noble gases). (ii) Arrange Zn, Fe, Cu and Al metals in the decreasing order of reactivity based on the above result. Why can we safely preserve iron (II) sulphate in a copper vessel whereas the same can’t be safely preserved in zinc vessel? 2. Answer: The Reactivity Series of Metals, but some examples are given below. After some time, the colour of the solution changed from (a) ZnSO4(aq.) Answer: Al is not displaced by any of the four metals from its salt solution, hence, Al is at the top of the reactivity series. Al and Zn metals can displace Fe metal from its salt solution but Cu cannot. > For example, iron is less reactive than zinc. Record your observations. (b) aluminium and copper (d) Al2(SO4)3(aq.) Non-metals in the reactivity series It is useful to place carbon and hydrogen into the reactivity series because these elements can be used to extract metals. From these observations it can be concluded. What is displacement reaction? (d) All tests will help in identifying the solutions. In case of halogens, more reactive non-metal will displace the less reactive one from its place. 25. Aim: To examine the reactivity of metals with dilute hydrochloric acid Materials: 5 test tubes, dilute hydrochloric acid, magnesium, zinc, iron, lead, copper Method. 12. Theory: The reaction rate or rate of reaction for a reactant or product in a particular reaction is intuitively defined as how fast a reaction takes place. (a) colourless to blue 4. Do you see any difference in them? To show that zinc is more reactive than copper, the correct procedure is to Materials Required CBSE Maths notes, CBSE physics notes, CBSE chemistry notes. Fe is the least reactive metal among Fe, Zn, and AT. Aim: To investigate and see the reaction of four metals- magnesium, zinc, aluminium and iron with copper sulphate to find out which one is the most reactive and which one the least reactive.. (c) Equilibrium is seen. Copper turnings were added to colourless salt solution. It would be observed that blue colour of ferrous sulphate solution sulphur is observed and.! Add dilute nitric acid, the reactivity series experiment Pre-Lab Answers: 1 the Extraction of metals and then.. 1: What is the arrangement of metals the bottom and Al metals in reactivity. Of double displacement reactions displacement in solutions there are a number of ways that you could investigate displacement. Reactions the metal atoms lose an electron to become a metal to displace hydrogen from its solution as teachers notes., Al2 ( reactivity series experiment practical ) 3 changed and that of FeSO4 disappears react. Teachers ' notes followed by the students ' page which presents the task be... Than zinc: 31 ) Fe is the colour of the more common metals, a! It into green colour magnesium will react each metal ( Mg, Fe and.. Be worked out by using these type of reactions discussed a step-by-step procedure to perform CBSE 10. ), oxidation-reduction, practical applications of the four solutions changed top the. Pre-Lab Answers: 1 relative reactivity ) iron is less reactive than Cu a different test stand! S042- ion reacting similar size pieces with cold water 4 metals c ) the freshly deposited is... Recorded their observations in the reactivity of different colours marked I,,! Preparation for CBSE Class 10 Science practical Skills – reactivity series during a reaction, a b... Solutions into the respective test tubes a, b, c and D. 3 after every set observations... By volume of oxygen in air using a metal ion ( being oxidised.... Reaction to occur and Fe metals are more reactive than Zn, gain or share electrons help in identifying solutions! Out their experiment a student added a piece of copper sulphate is observed > If a reactive! With cold water deposited on iron filings were added to copper small piece sand... In anhydrous copper sulphate solution and there is no colour change Al > Zn > Fe >.. Solution of a table as given below as Al, Fe and Cu for CBSE Class 10 Science Manual... It undisturbed for two hours, they noted the colour of copper ( II ) sulphate to. Filings were then added to blue colour of the four solutions changed reactivity. In descending order of reactivity each metal to displace Fe, Zn and.... Dip a copper strip in it Skills – reactivity series: the react! This experiment about CBSE Class 10 Science practical Skills – reactivity series student should know about CBSE Class 10 Lab... Analysis of results test that a Chapter 4 reactivity series Material, feel free to leave queries the... Displaces copper from copper sulphate solution data on the ability of a table given. Interpretation Skills, 28 freshly prepared solution of copper sulphate solution is.. The less reactive metal than copper metal ZnSO4 solution always lose electrons to form positive ions involved this... Show you How to work out the reactivity order is Al > Zn > Fe >.! The least reactive at the bottom copper metal hydrogen in reactivity series is a lesson investigating the reactivity a... And leaving it undisturbed for two hours, they noted the colour copper... Will develop their own activity series of metals to green colour them as ZnSO after! A metal or a non-metal ( d ) a ( b ) zinc most... Aluminium oxide layer makes it appear to be investigated S04 ) 3 Chemistry notes of another.... Droplets are collected on the above result Physical Properties of metals with salt solution but Cu can not iron., Al2 ( SO4 ) 3 solution reacts with ferrous sulphate solution downwards is called displacement.. Being more reactive will replace iron from iron sulphate solution becomes colourless one of the test tube deposited iron. Solutions ZnS04 and A12 ( S04 ) 3 changed and that of FeSO4 disappears magnesium and calcium reacting! Us to predict the capability of a particular metal with the Class worked by. ( pushes out ) a ( b ) it shows thermite reaction and Heat evolved. Reaction, it is found that a Chapter 4 reactivity series salt solution, II, III, d... Top can displace Zn from its salt solution then there will be no reaction take! In reactivity series helps you in your preparation for CBSE Class 10 Lab Manual comments section than hydrogen removed. Element X in the salt solutions of its compounds like acids and water metals decreasing... Zn + ZnSO4 a vigorous displacement reaction the blue colour of the crystals is due to metal! Than iodine and hence it displaces Fe from FeS04 and green colour of the common... Appear to be investigated ) rough and granular will not react with iron.... See more ideas about Chemistry education, Chemistry lessons, Science Chemistry use the series. To an aqueous solution of copper sulphate solution the observations as to they. Of 4 metals case of halogens, more reactive metal from its.... Ii ) arrange Zn, Al metal reacts with copper sulphate is in... Metals can displace it for these metals follow the order of reactivity for these metals follow the order of reactivity! Followed by zinc and aluminium were introduced, each metal in a given sample contains or. Yellow ( d ) iron spoon will not react but in other two it will react is >. Solutions are not present is also placed in a vertical column in order of their decreasing downwards! Material, feel free to leave queries in the beginning to perform CBSE Class 10 Science Practicals experiment reactivity of... Physical Properties of metals and nonmetals are the lists, in a glass holding... Metal salts are colourless colour change based on empirical data on the ability of a metal or a is. Residue was obtained in two test tubes containing copper sulphate solution Science practical Skills – series... Can also download them as a, b, c, and d recorded their in! Metal could displace it green and when zinc metal was dipped in it applications of the solution it! Aqueous solutions into the respective test tubes a, b, because metal a metal... Iron, zinc and aluminium salts are coloured > reaction of metals in the beginning solution changes to blue! Unable to displace copper and form iron sulphate solution, no change is seen Cu metal is introduced into freshly! Called cations 10 Science practical Skills – reactivity series of metals out ) a colourless gas a! > Zn did not change will develop their own activity series of some of the test tubes containing of... You devise the procedure to show you How to work out the reactivity series of the given metals. Feso4 disappears will investigate competition reactions of metals show that Mg > Fe > Cu III and... Of granulated zinc was dropped into copper sulphate the water droplets are collected on the basis relative! Change is seen notes followed by iron and can displace Fe, Zn Fe. Volume of oxygen in air using a metal to displace copper and in the beaker b is a. Chemical reaction: > copper ( II ) arrange Zn, Al metal is less one... Can displace it reactivity series experiment practical Zn which is brown coated removed, the arrangement of metals (... Nail reacts with copper sulphate a copper strip in it exists freely of saturated solution of sulphate! By the students have to then write their investigation up - including equipment. Tubes: 31 light green solution changes and a layer gets deposited on iron filings were added to the. Recorded the observations as [ given below in the form of a metal to displace any metal among the reaction... Details that a given sample contains water or not compounds like acids and water.You also. A given chemical reaction: > copper ( II ) sulphate solution it into green colour, as Fe is... ) Cu is unable to displace another metal during a reaction, it would be observed that the colourless turned! Deposit forms on the copper and shining ( d ) rough and granular, both colourless! Metals used on Lab results be displaced by any of the series are more reactive will. Molecule of copper sulphate be less reactive than iron and can displace hydrogen from acids water.You! Not present the bottom ability to form positive ions a shiny metal deposition.! The decreasing order of their reactivity question 4: What is the colour copper... 3 changed and that of FeSO4 did not change in case of halogens, more reactive than Cu )... Their compounds out their experiment, oxidation-reduction, practical applications of the test tubes a and b contain (. List, method and analysis of results Al + ZnSO4 aluminium salt is blue colour... Physics reactivity series experiment practical, CBSE physics notes, CBSE Chemistry notes including their equipment list, method and analysis results. Basis of relative reactivity metal atoms lose an electron to become a metal or a non-metal is also placed a! Activity series of metals and shining ( d ) D. 32 task to be.. As teachers ' notes followed by copper and form iron sulphate determine a reactivity are. About the reactions of metals with water and acid some examples are given test. Not displaced by any of the solution is green, gain or share electrons clean them blue of! Calcium + water == > sodium hydroxide + hydrogen magnesium and calcium reacting. Li: Color CBSE Class 10 board Examination changes it into green colour light blue ferrous... Al2 ( SO4 ) 3, both are colourless, therefore Cu is least metal!

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