The formula of carnallite is:

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$LiAl {({Si}_{2} O_{5})}_{2}$

$KCl \cdot M_{5} {Cl}_{2} \cdot 6 H_{2} O$

$K_{2} O \cdot {Al}_{2} O_{3} \cdot 6 {SiO}_{2}$

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

answer is B.

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Detailed Solution

The formula of carnallite is $KCl \cdot Mg {Cl}_{2} \cdot 6 H_{2} O$

Potassium magnesium chloride is another name for carnallite.

A hydrated potassium magnesium chloride with the chemical formula ${KMgCl}_{3} \cdot 6 (H_{2} O),$ carnallite (also known as carnallite) is an evaporite mineral. Its hues range from yellow to white, reddish, and even colorless or blue.

Hence, option b is correct.

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