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Question

Identify the element Y in the following reaction.

Y+2HCl → 2NaCl+H2O+SO2

A
Na2S
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B
Na2SO2
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C
Na2SO3
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D
Na2SO4
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Solution

The correct option is C Na2SO3
In the preparation of sulphur dioxide, sodium sulphite crystals and dilute hydrochloric acid is mixed to produce sodium chloride, sulphur dioxide and water.
The reaction is:
Na2SO3+2HCl 2NaCl+H2O+SO2

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