What coefficients are required to balance the following equation?
$C a {(O H)}_{2} + H C l \to C a {C l}_{2} + H_{2} O$

2, 4, 2, 4

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1, 2, 2, 2

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1, 2, 1, 1

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1, 2, 1, 2

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Solution

The correct option is D $1, 2, 1, 2$
$C a (O H)_{2} + H C l \to C a C l_{2} + H_{2} O$
As the product $C a C l_{2}$ has $2$ atoms of chlorine. So add $2 m o l e s$ of $H C l$ .
$\Rightarrow$ $C a (O H)_{2} + 2 H C l \to C a C l_{2} + H_{2} O$
In reactants, there are $2 m o l e s$ of oxygen. So, add $2 m o l e s$ of water on product side.
$C a (O H)_{2} + 2 H C l \to C a C l_{2} + 2 H_{2} O$ [Balanced]

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