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Question

Sulphide ions in alkaline solution react with solid sulphur to form polyvalent sulphide ions. The equilibrium constant for the formation of S22 and S23 from S and S2 ions are 1.7 and 5.3 respectively. Equilibrium constant for the formation of S23 from S is:


A

1.33

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B

3.11

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C

4.21

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D

1.63

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Solution

The correct option is B

3.11


S+S2S22; K1eq1

2S+S2S23; K2 eq2

_______________

S+S22S23; K3 eq3

eq3=(eq1)+(eq2)

K3=K2K1=5.31.7=3.11


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