Q.

pH of a mixture containing 0.10 M X- and 0.20 M HX is   pKbX- = 4

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a

4 + log 2

b

4 - log 2

c

10 + log 2

d

10 - log 2

answer is D.

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Detailed Solution

pOH=pKb + log  SaltAcid == 4 + log  0.20.1∴    pOH = 4+log 2 and pH = 10-log 2
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