Q.

Statement I : When 0.1M weak diprotic acid H2A dissociates with its dissociation constants Ka1 = 10-3 and Ka2 =10-8

 and , then [A–2] is almost equal to 10–3M.

Statement II : Since Ka2<<Ka1 for 0.1 M H2A, so [A–2] is considerable w.r.t. [HA].

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a

Both statement - I  and statement - II are False

b

Statement I is correct and Statement II is incorrect

c

Statement I and II are correct

d

Statement - I is incorrect and Statement II is correct

answer is D.

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Detailed Solution

H2AC0-xHA-x-y+H+x+y;Ka1=x×xC0

HA-x-yAy-2+Hy+x+;Ka2=x×yx

Ka1Ka2xy

y=Ka2

 Also, C0x

A-2Ka2

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Statement I : When 0.1M weak diprotic acid H2A dissociates with its dissociation constants Ka1 = 10-3 and Ka2 =10-8 and , then [A–2] is almost equal to 10–3M.Statement II : Since Ka2<<Ka1 for 0.1 M H2A, so [A–2] is considerable w.r.t. [HA–].