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Q.

A hydrogen electrode placed in a buffer solution of sodium cyanide and hydrogen cyanide in the ratio x:y and y:x has the electrode potential values “a” and “b” volts respectively at 250C. If a – b = 35.52 mV. Then y:x is

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a

2

b

1

c

6

d

3

answer is B.

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Detailed Solution

H++e-→12H2

a=E1= 0.0591log[H+]1

b=E2= 0.0591log[H+]2

a-b=35.521000=0.0592logyx2

yx=Antilog 0.30=2

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