Q58 of 152 Page 49

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.

(a) Name of the Salt is Ferrous sulphate.

(b) It is a Decomposition reaction


(c) Ferrous sulphate decomposes to give Ferric Oxide, Sulphur dioxide and Sulphur trioxide.



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56 Consider the reaction:


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Mg (s) + CuO (s) → MgO (s)+ Cu(s)


This equation represents:

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(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?