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Question

Assertion :When 0.1 M weak diprotic acid H2A dissociates with its dissociation constants Ka1=103 and Ka2=108, then [A2] is almost equal to 103 M Reason: Since Ka2Ka1 for 0.1 M H2A, so [A2] is negligible w.r.t. [HA]

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is D Both Assertion and Reason are incorrect
H2AHA+H+
0.1C C C
Ka1=C20.1C=103
C2+103C104=0
C=9.5×103 M (1)
HAH++A2
CC C C
Ka2=C2CC=108
C2+108C108C=0
i.e., C2+108C=9.5×1011=0 [From 1]
C=9.74×106 M
Hence, [A2] is almost equal to 9.74×106 M
Hence, the assertion is incorrect.
Further, C=[HA]=9.5×103 M and C=[A2]=9.74×106 M
Hence, [A2] is not so negligible with respect to [HA]
Hence, the reason is incorrect.

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