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?

A
4
B
3
C
2
D
1

Solution

## The correct option is D 1We know that silica is $$SiO_2$$.When $$SiO_2+Mg(OH)_2\rightarrow MgSiO_3(X)$$$$MgSiO_3+2HCl\rightarrow SiO_2.2H_2O(Y)+MgCl_2(Z)$$Since $$1\ mole\ SiO_2.2H_2O$$ is formed which is $$Y$$Hence option D is the correct answer.Chemistry

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