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Reactivity Trends (Group 2)

Silica reacts...

Question

Silica reacts with magnesium to form a magnesium compound (X). X reacts with dil HCl and forms (Y) and (Z). If two moles of HCl react with one mole of X how many moles of Y will be formed?

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Solution

The correct option is D 1
We know that silica is $S i O_{2}$ .

When $S i O_{2} + M g (O H)_{2} \to M g S i O_{3} (X)$

$M g S i O_{3} + 2 H C l \to S i O_{2} .2 H_{2} O (Y) + M g C l_{2} (Z)$

Since $1 m o l e S i O_{2} .2 H_{2} O$ is formed which is $Y$

Hence option D is the correct answer.

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