If an acid-base reaction HA(aq) + B – (aq) 
HB(aq) + A – (aq) has K eq = 10 –4 , how many of the following statements are true ?
(i) HB is stronger acid than HA
(ii) HA is stronger acid than HB
(iii) HA and HB have the same acidic strength
(iv) B – is stronger base than A –
(v) A – is stronger base than B –
(vi) B – and HB are conjugate acid-base pair
(vii) A – is the conjugate base of acid HA.
(viii) HA can be HSO 4 – and HB can be HCOOH.
(ix) A – can be F – and B – can be CN – .
Text Solution
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4 (i, v, vi, vii)
HA (aq) + B – (aq) 
HB(aq) + A – (aq) K eq. = 10 –4
K eq. is very small, So reaction shift in backward direction.
HB is more stronger acid than HA.
A – is more stronger base than B – .
B – and HB are conjugate acid-base pair.
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