When comparing anions from the same group, larger size of A in the H-A bond increases / decreases (circle the correct answer) acid strength.

increases

Explanation:

The acid strength of any species depends on the stability of its conjugate base,

The conjugate base is formed via the removal of the hydrogen ion.

Hence, more stable the conjugate base, more acidic would be the compound.

The conjugate base have a negative charge,

Hence, larger the anion or the conjugate base, more stable it would be, because the negative charge will get dispersed on the larger species, hence will become stabilized.

Therefore,

Larger the size of anion or the conjugate base, more stable would be the anion and more acidic would be the compound.