Question

Give a reaction which is associated with a change in colour and in the physical state

Answer 1

CHANGE IN COLOUR :-
Fe + CuSO4 -------> FeSO4 + Cu

CuSO4 is a blue coloured solution while FeSO4 is a green coloured solution.

Physical state :

NH3 (gas) + HCl (gas) -----> NH4Cl (solid)

Answer 2

Explanation:

A reaction which is associated with a change in colour is as follows:

• Iron reacts with copper sulphate solution to form ferric sulphate solution and copper.
• In this reaction the solution is present in blue after formation of product it will be changes to black colour solution.

The chemical reaction is as follows:

$\mathrm{Fe}+\mathrm{CuSO}_{4} \rightarrow \mathrm{FeSO}_{4}+\mathrm{Cu}$

A reaction which is associated with a change in physical change is as follows:

• Ammonia gas reacts with hydrochloric acid to form ammonium chloride.
• The gaseous state of ammonia gas is converted into the solid state of ammonium chloride.

The chemical reaction is as follows:

$N H_{3}(g)+H C l(g) \rightarrow N H_{4} C l(s)$