Q2.
Ans: B.
How?

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Dear Student

B is not correct.

Given that acid is 10% dissociated with both H⁺ equally dissociated.
So, reaction becomes
                          H₂A      <-----------> 2H⁺ + A^2-
Initial                 C                               0      0
At equilibrium    C-Cα                      2Cα    Cα

Now, H⁺ concentration = 2Cα
α = 0.1
C = 5 x 10^-3 M
2Cα = 2* 5 x 10^-3*0.1 = 1 x 10^-3

​​​Correct answer is A 

Regards