Available Answers

1. 1.

   Rusting of iron is an exothermic reaction, even then the heat evolved is unnoticeable. Give reasons.

2. 2.

   During building of structures, concrete slabs are set slowly. Give reasons.

3. 3.

   Certain exothermic reactions in the human body are beneficial to mankind. Give reasons.

4. 4.

   Silver bromide is stored in a brown coloured thick glass bottle. Give reasons.

5. 5.

   Chemical reaction involving solid reactants are not subjected to pressure changes for completion of the reaction. Give reasons.

6. 6.

   To obtain hydrogen gas from pure water a drop of dilute sulphuric acid is added to it before subjecting it to electrolysis. Give reasons.