There are some impurities found during the preparation of hydrogen in the laboratory.
$(b)$ How can these impurities be removed ?

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Solution

The process by which the impurities can be removed are listed below:

Types of impurities Method Reaction

$(i)$ Arsine and phosphine impurities Adding silver nitrate $(A g N O_{3})$ solution

$A s H_{3} + 6 A g N O_{3} \to A g_{3} A s + 3 A g N O_{3} + 3 H N O_{3}$

$P H_{3} + 6 A g N O_{3} \to A g_{3} P + 3 A g N O_{3} + 3 H N O_{3}$

$(i i)$ Hydrogen sulphide impurites Adding lead nitrate $P b (N O_{3})_{2}$ solution

$P b (N O_{3})_{2} + H_{2} S \to P b S + 2 H N O_{3}$

$(i i i)$ Sulphur dioxide carbon dioxide and oxides of nitrogen Adding caustic potash $(K O H)$ solution

$S O_{2} + 2 K O H \to K_{2} S O_{3} + H_{2} O$

$C O_{2} + 2 K O H \to K_{2} C O_{3} + H_{2} O$

$N_{2} O_{4} + 2 K O H \to K_{2} N_{2} O_{5} + H_{2} O$

$(i v)$ Water vapour Drying agent

Fused calcium chloride $(C a C l_{2})$ caustic potash stick is used to remove water vapour

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Similar questions

State the method by which impurities present in natural water can be removed.

In laboratory preparation of hydrogen, impurities of arsine and phosphine can be removed by passing it through which of the following solution?

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Types of impurities	Method	Reaction
$(i)$ Arsine and phosphine impurities	Adding silver nitrate $(A g N O_{3})$ solution	$A s H_{3} + 6 A g N O_{3} \to A g_{3} A s + 3 A g N O_{3} + 3 H N O_{3}$ $P H_{3} + 6 A g N O_{3} \to A g_{3} P + 3 A g N O_{3} + 3 H N O_{3}$
$(i i)$ Hydrogen sulphide impurites	Adding lead nitrate $P b (N O_{3})_{2}$ solution	$P b (N O_{3})_{2} + H_{2} S \to P b S + 2 H N O_{3}$
$(i i i)$ Sulphur dioxide carbon dioxide and oxides of nitrogen	Adding caustic potash $(K O H)$ solution	$S O_{2} + 2 K O H \to K_{2} S O_{3} + H_{2} O$ $C O_{2} + 2 K O H \to K_{2} C O_{3} + H_{2} O$ $N_{2} O_{4} + 2 K O H \to K_{2} N_{2} O_{5} + H_{2} O$
$(i v)$ Water vapour	Drying agent	Fused calcium chloride $(C a C l_{2})$ caustic potash stick is used to remove water vapour