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  4. Mica is a mineral of aluminium. The chemical formula of mica is K2O.xAl2O3.ySiO2.2H2O . The value of y is

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Q. Mica is a mineral of aluminium. The chemical formula of mica is $K_{2}O.xAl_{2}O_{3}.ySiO_{2}.2H_{2}O$ . The value of $y$ is

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Solution:

The chemical formula of mica is $K_{2}O.3Al_{2}O_{3}\cdot 6SiO_{2}\cdot 2H_{2}O.$
$\therefore $ Value of $y$ is $6.$