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Preparation and Properties and Uses of Potassium Hydroxide

Colourless sa...

Question

Colourless salt (A) give white ppt (B) with NaOH; ppt (B) dissolves in excess of NaOH to form (C). On passing $H_{2} S$ gas into (C) white ppt (D) appears. (A) also gives white ppt (E) with $A g N O_{3}$ solution. What is (A)?

Z n C l_{2}

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Z n (O H)_{2}

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Z n O

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Z n S

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Solution

The correct option is A $Z n C l_{2}$
Option (A) is correct. Compound (A) is zinc chloride $Z n C l_{2}$

Colourless salt (A) give white ppt (B) with NaOH

$Z n C l_{2} [A] + 2 N a O H ⟶ Z n (O H)_{2} [B] + 2 N a C l$

Ppt (B) dissolves in excess of NaOH to form (C).
$Z n (O H)_{2} + 2 N a O H ⟶ N a_{2} Z n O_{2} [C] + H_{2} O$

On passing $H_{2} S$ gas into (C) white ppt (D) appears.
$N a_{2} Z n O_{2} + H_{2} S ⟶ Z n S [D] + 2 N a O H$

(A) also gives white ppt (E) with $A g N O_{3}$ solution.
$Z n C l_{2} + 2 A g N O_{3} ⟶ 2 A g C l [E] + Z n (N O_{3})_{2}$

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