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Standard IX

Chemistry

Hardness of Water:Causes, Types and Treatments

A colourless ...

Question

A colourless crystalline salt, on being heated, gives a colourless gas with a pungent smell. On being passed through an $A g N O_{3}$ solution, this gas forms a white precipitate insoluble in $H N O_{3}$ but readily soluble in an $N H_{3}$ solution. Which of the following reactions can lead to the above observation ?

M g C l_{2} + H_{2} O \to M g (O H) C l + H C l

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(N H_{4}) 2 C O_{3} \to 2 N H_{3} + C O_{2} + H_{2} O

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Z n S O_{3} \to Z n O + S O_{2}

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N a N H_{4} H P O_{4} \to N a P O_{3} + N H_{3} + H_{2} O

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Solution

The correct option is D $Z n S O_{3} \to Z n O + S O_{2}$
$Z n S O_{3} \to Z n O + S O_{2} colourless gas with a pungent smell.$

$A g N O_{3} + H_{2} S \to A g_{2} S$ ppt.

Option C is correct.

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A colourless crystalline salt, on being heated, gives a colourless gas with a pungent smell. On being passed through an AgNO3 solution, this gas forms a white precipitate insoluble in HNO3 but readily soluble in an NH3 solution. Which of the following reactions can lead to the above observation ?

The correct option is D ZnSO3→ZnO+SO2ZnSO3→ZnO+SO2colourless gas with a pungent smell. AgNO3+H2S→Ag2S ppt.Option C is correct.

The correct option is D $Z n S O_{3} \to Z n O + S O_{2}$
$Z n S O_{3} \to Z n O + S O_{2} colourless gas with a pungent smell.$

$A g N O_{3} + H_{2} S \to A g_{2} S$ ppt.

Option C is correct.