Find out A in the given flowchart:

M g c a t i o n

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M g C l_{2}

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M g (O H)_{2}

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C a c a t i o n

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Solution

The correct option is A $M g c a t i o n$
Sea water contains magnesium chloride which is removed by treating sea water with slaked lime.
$M g C l_{2} (in sea water) + C a (O H)_{2} (slaked lime) \to M g (O H)_{2} ↓ + C a C l_{2}$
The precipitated magnesium hydroxide reacts with HCl to form magnesium chloride.
$M g (O H)_{2} + 2 H C l \to M g C l_{2} + 2 H_{2} O$
Magnesium chloride dissolves in water and on heating, it is hydrolyzed.
$M g C l_{2} + 2 H_{2} O h e a t - - \to M g (O H)_{2} + 2 H C l$
Thus, the cation A is $M g^{2 +}$ .

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