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Hydrochloric Acid

Silver nitrat...

Question

Silver nitrate gives a white precipitate (A) with aqueous sodium thiosulphate (B); the precipitate dissolves in excess of thiosulphate. If the precipitate is heated with water., it turns black (C), and the upper layer liquid then gives a white precipitate (D) with acidified barium nitrate solution.

What is the'formula of white ppt. (A) ?

A

A g_{2} S

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B

A g S_{2} O_{3}

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C

A g_{2} S_{2} O_{3}

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D

A g N O_{3}

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Solution

The correct option is A $A g_{2} S_{2} O_{3}$
Reaction:
$\begin{matrix} 2 A g N O_{3} & + & N a_{2} S_{2} O_{3} & ⟶ & A g_{2} S_{2} O_{3} ↓ & + & 2 N a N O_{3} \end{matrix}$

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