Q61 of 152 Page 49

A strip of metal X is dipped in a blue coloured salt solution YSO4. After some time, a layer of metal Y form the salt solution is formed on the surface of metal strip X. Metal X is used in galvanization whereas metal Y is used in making electric wires. Metal X and metal Y together form an alloy Z.

(a) What could metal X be?


(b) What could metal Y be?


(c) Name the metal salt YSO4.


(d) What type of chemical reaction takes place when metal X reacts with salt solution YSO4? Write the equation of the chemical reaction involved.


(e) Name the alloy Z.

(a) Metal X is Zinc(Zn).

(b) Metal Y is Copper(Cu)


(c) Metal Salt is Copper Sulphate(CuSO4).


(d) Displacement Reaction takes place.


The chemical equation:


CuSO4 (aq) + Zn (s) ZnSO4 (aq) + Cu (s)


(e) Alloy Z is Brass.



More from this chapter

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59 A colourless lead salt, when heated, produces a yellow residue and brown fumes.

(a) Name the lead salt.


(b) Name the brown fumes.


(c) Write a chemical equation of the reaction involved.

 60 When hydrogen burns in oxygen, water is formed and when water is electrolysed, then hydrogen and oxygen are produced. What type of reaction takes place:

(a) in the first case?


(b) in the second case?

 62 When a black metal compound XO is heated with a colourless gas Y2, then metal X and another compound Y2O are formed. Metal X is red-brown in colour which does not react with dilute acids at all. Gas Y2 can be prepared by the action of a dilute acid on any active metal. The compound Y2O is a liquid at room temperature which can turn anhydrous copper sulphate blue.

(a) What do you think is metal X?


(b) What could be gas Y2?


(c) What is compound XO?


(d) What is compound Y2O?


(e) Write the chemical equation of the reaction which takes place on heating XO with Y2.


(f) What type of chemical equation of the reaction which takes place on heating XO with Y2.

 63 A metal X forms a water soluble salt XNO3. When an aqueous solution of XNO3 is added to common salt solution, then a white precipitate of compound Y is formed along with sodium nitrate solution. Metal X is said to be the best conductor of electricity and it does not evolve hydrogen when put in dilute hydrochloric acid.

(a) What is metal X?


(b) What is salt XNO3?


(c) Name the compound Y.


(d) Write the chemical equation of the reaction which takes place on reacting XN03 solution and common salt solution giving the physical states of all the reactants and products.


(e) What type of chemical reaction is illustrated by the above equation?