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Dehydration of salts is an important class of heterogenous reaction. The salt hydrates often dissociate in steps to form a number of intermediate hydrates according to the prevailing pressure of moisture in contact with the solid hydrates. Thus copper sulphate pentahydrate on dissociation yields trihydrates, monohydrates and then the anhydrous salts in the above order as follows.

The ratio of equilibrium constant between pentahydrate and trihydrate and equilbrium between trihydrate and monohydrate is :

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2.9

8.6

5.6

1.9

answer is A.

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Detailed Solution

${CuSO}_{4} {.5H}_{2} O ⇌ {CuSO}_{4} {.3H}_{2} {O+2H}_{2} O (g)$

$K_{p} = {(7.8)}^{2} = 60.84$

${CuSO}_{4} {.3H}_{2} O ⇌ {CuSO}_{4} {.H}_{2} {O+2H}_{2} O (g)$

${K^{'}}_{p} = {(P_{H_{2} O})}^{2} = {(5.6)}^{2} = 31.36$

The ratio $\frac{K_{p}}{{K^{'}}_{p}} = \frac{60.84}{31.36} = 1.9$

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