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Reduction of Carboxylic Acids

Which sulphid...

Question

Which sulphide is insoluble in dilute acids but soluble in alkalies?

A

P b S

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B

C d S

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C

F e S

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D

A s_{2} S_{3}

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Solution

The correct option is B $A s_{2} S_{3}$
Option (D) is correct.
$A s_{2} S_{3}$ is insoluble in dilute acids but soluble in alkalies.
$\begin{matrix} A s_{2} S_{3} & + & 4 N a O H & ⟶ & N a A s O_{2} & + & 3 N a A s_{2} & + & 2 H_{2} O (B r i c k r e d) \end{matrix}$

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