Shikha Goel and Saleha Parvez Solutions for Chapter: Chemical Changes and Reactions, Exercise 4: CHAPTER EXERCISE

Close contact of reacting substances during a chemical reaction is required for the exchange of 

${\mathrm{AgNO}}_3\left(\mathrm{aq}\right) +\mathrm{NaCl} \left(\mathrm{aq}\right) \to \mathrm{AgCl}\left(\mathrm{s}\right) + {\mathrm{NaNO}}_3\left(\mathrm{aq}\right)$

The above reaction is

The process by which we can get sodium and chlorine in elemental form from common salt is

Aluminium metal reacts with sulphuric acid to form

When dilute hydrochloric acid is added to zinc pieces taken in a test tube.

In an endothermic reaction

Magnesium burns in the environment of 

(i) What will you observe when you put

(a) some zinc pieces into blue copper sulphate solution.
(b) Some copper pieces into green ferrous sulphate solution.

(ii) Write the balanced chemical equation also.