Question

Activity 2.9 class 10th ncert science full solution

Answer 1

Explanation:

Explanation:

Solid sodium chloride reacts with concentrated sulphuric acid and forms dry hydrochloric acid gas. Here HCl is produced in gaseous form as there is no water.

NaCl(S) + H2SO4(Conc.) ———> Na2SO4 (s)+ HCl(g)

A litmus paper works on H+ or OH- ion. Since there is no water in HCl gas, HCl does not dissociate into its ion and does not turn the blue litmus red.

HCl (aq) ——-> H+ + Cl–

Inference/Conclusion:

Concentrated acids and bases need an aqueous medium to turn litmus paper.