46. Assertion (A) The ionisation of hydrogen sulphide in water is low in the presence of hydrochloric acid

Reason (R) Hydrogen sulphide is a weak acid.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not the correct explanation of A

(c) A is true but R is false

(d) Both A and R are false

(b) Both assertion and reason are true but reason is not correct explanation of assertion.
HCl gives the common H+ ions and hence ionisation equilibrium ${\mathrm{H}}_{2}\mathrm{S}⇌2{\mathrm{H}}^{+}+2{\mathrm{S}}^{2-}$ is suppressed.