Available Answers

1. 1.

   Explain : 'Silver nitrate solution is kept in coloured reagent bottles in the laboratory.'

2. 2.

   Give an example of an endothermic reaction.

3. 3.

   Reactions can be classified as: Direct combination, decomposition, simple displacement, double decomposition, Redox reactions.

   State which of the following types, takes place in the reactions given below

   i. Cl2+ 2Kl → 2KCl + l2	ii. 2Mg + O2 → 2MgO
   iii. SO2 + 2H2O + Cl2 → 2HCl + H2SO4	vi. AgNO3 + HCl → AgCl + HNO3
   v. 4HNO3 → 4NO2 + 2H2O + O2

    

4. 4.

   Explain the term chemical reaction with special reference to reactants and products.

5. 5.

   Give a suitable example with equation to show the representation of a chemical reaction.

6. 6.

   A chemical reaction is often accompanied by external indications or characteristics. Give two examples where a chemical reaction is accompanied by a change in colour of the reactants & products on completion of the reaction.