An aqueous solution of hydrogen sulphide shows the equilibrium: `H_(2) S hArr H^(o+)+HS^(ɵ)`
If dilute hydrochloric acid is added to an aqueous solution of `H_(2)S`, without any change in temperature, the
a. The equilibrium constant will change.
b. The concentration `HS^(ɵ)` will increase.
c. The concentration of un-dissociated hydogen sulphide will decrease.
d. The concentration of `HS^(ɵ)` will decrease.

Options

A. the equilibrium constant will change
B. the concentration of `HS^(-)` will increase
C. the concentration of undissociated hydrogen sulphide will decrease
D. the concentration of `HS^-` will decrease

Answer

D