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For the preparation of sodium thiosulpha...

For the preparation of sodium thiosulphate by 'Spring's reaction', the reactants used are : `Na_2S + Na_2SO_3 +Cl_2` , `Na_2S+SO_2` , `Na_2S + Na_2SO_3 +I_2`, `Na_2SO_3 +S`

A

`Na_2S +Na_2SO_3 + Cl_2`

B

`Na_2S + SO_2`

C

`Na_2S + Na_2SO_3 + I_2`

D

`Na_2SO_3 + S`

Text Solution

Verified by Experts

The correct Answer is:
C
Spring.s reaction of preparation of sodium thiosulphate
`Na_2S + Na_2SO_3 + I_2 rarr Na_2S_2O_3 + 2NaI`
The resulting solution is concentrated and allowed to crystallise, when crystals of `Na_2S_2O_3.5H_2O` being less soluble, separates out first.
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