IONIC 1

VITEEE 2015 Coaching › Physical Chemistry questions › IONIC 1

Consider the following reactions in aqueous medium :
A : H₂CO₃ (aq) + HSO₄^-(aq) â†’ H₂SO₄(aq) + HCO₃^-(aq)

B : HF(aq) + Cl^- (aq) â†’ HCl(aq) + F^- (aq)

C : HF(aq) + NH₃(aq) â†’ NH₄⁺ + F^-

D : HSO₄^- + CN^- â†’ HCN + SO₄^2-

Reactions proceeding to the right are option(s) ____________ .

Ans: C and D

Reason ? Why not A and B ?

#Chemistry #Physical Chemistry

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7 Answers

4

UTTARA ·2010-03-22 10:07:24

For B:

With increasing atomic radius, acidity also increases.

sO Hcl is a stronger acid

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1

Manmay kumar Mohanty ·2010-03-22 10:07:24

B) mayn't be becoz i don't thnk Cl^- is capable of replacing F^-

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4

UTTARA ·2010-03-22 10:09:48

fOR a :

Strength of acid is the determining factor here too

H2SO4 is stronger than H2CO3

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Bicchuram Aveek ·2010-03-22 10:09:50

Reason for C and D being the answer ???? That's the most important doubt.

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Tapas Gandhi ·2010-03-22 10:10:53

H₂CO₃ cannot be isolated to react thus.

F^- cannot be replaced. (agreed with Manmay)

Can someone justify C???

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Bicchuram Aveek ·2010-03-22 10:12:49

This is from NEW PATTERN IIT-JEE Chemistry by ARIHANT PUB.

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4

UTTARA ·2010-03-22 10:16:21

c :

HF is a stronger acid than NH4 +

(considering conjugate base concept )

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