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Question

The concentration of NO3 in middle compartment after passage of 0.1 F charge will be:
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A
0.95 M
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B
0.90 M
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C
0.975 M
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D
1.05 M
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Solution

The correct option is B 0.95 M
Equivalent of Zn2+ produced = 0.1 or moles of Zn2+=0.120.05
+ve charge increases in first compartment so due to interaction and maintain electrical neutrality Zn2+ move toward II compartment and NO3 move towards first compartment. Solution is always electrically neutral so charge of 1Zn2+ is neutralized by 2NO3.
[Zn2+] in first compartment
=1+0.052=1.025M
Concentration of NO3 in second compartment
=10.05=0.95M {Option A}

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