How will you identify anion in the ${\mathrm{Na}}_2\mathrm{S}$ using dilute sulphuric acid? 

Select acidic gases from the gases mentioned below:

(i) Ammonia

(ii) Sulphur dioxide

(iii) Hydrogen chloride

(iv) Chlorine

(v) Carbon dioxide

(vi) Oxygen

(vii) Hydrogen

How is the acidic nature suspected?

Write your observation when dilute sulphuric acid is added to the following:

• A metal carbonate (sodium carbonate)

Write your observation when dilute sulphuric acid is added to the following:

• A metal sulphide (sodium sulphide)

State if the following statement is true or false. Correct the false statement.

• The action of dilute sulphuric acid on marble chips produces carbon dioxide.