Q59 of 152 Page 49

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.

(a) Name of the salt is Lead nitrate.

(b) Brown fumes is the compound Nitrogen dioxide.


(c) The chemical Equation of reaction.


2Pb(NO3)2(s) 2PbO (s) + 4NO2 (g) + O2 (g)



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 58 When a green iron salt is heated strongly, its colour finally changes to brown and odor of burning sulphur is given out.

(a) Name the iron salt.


(b) Name the type of reaction that takes place during the heating of iron salt.


(c) Write a chemical equation for 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?

 61 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.