Q 2686723677.     An aqueous solution of a metal bromide `MBr_2 (0.05 M)` is saturated with `H_2S` What is the minimum `pH` at which `MS` will precipitate?

`K_(sp) ` for `MS= 6.0 xx 10^(-21)`, concentration of saturated
`H_2S=0.1 M, K_1=10^(-7)` and `k_2 = 1.3 xx 10^(-13)` for `H_2 S`

JEE 1993
A

2

B

1

C

3

D

5

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