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Which of the following minerals represents the composition of kainite?

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$K_{2} {SO}_{4} \cdot {MgSO}_{4} \cdot 6 H_{2} O$

$K_{2} {SO}_{4} \cdot {MgCl}_{2} \cdot 6 H_{2} O$

$K_{2} {SO}_{4} \cdot {MgSO}_{4} \cdot {MgCl}_{2} \cdot 6 H_{2} O$

$KCl \cdot {MgCl}_{2} \cdot 6 H_{2} O$

answer is D.

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Detailed Solution

$MgSO 4 \cdot KCl \cdot 3 (H 2 O)$

Molecular Weight $= 248.97 gm$

Potassium $15.70 % K 18.92 % K_{2} O$

Magnesium $9.76 % Mg 16.19 % MgO$

The correct Ans. is $K_{2} {SO}_{4} \cdot {MgSO}_{4} \cdot {MgCl}_{2} \cdot 6 H_{2} O$ .

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