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Zinc Ion

Which of the ...

Question

Which of the following salts does not form any precipitate with excess of $N a O H$ ?

Z n C l_{2}

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F e C l_{3}

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C r C l_{3}

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C u S O_{4}

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Solution

The correct option is A $Z n C l_{2}$
Zinc chloride reacts with sodium hydroxide to form a precipitate of zinc hydroxide. This precipitate dissolves in excess sodium hydroxide to form sodium zincate.
$Z n C l_{2} + 2 N a O H \to Z n (O H)_{2} + 2 N a C l Z n (O H)_{2} + 2 N a O H \to N a_{2} Z n O_{2} + 2 H_{2} O$

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