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Question

Sodium salt (A) of a dibasic acid HCl−−→ gas (B)

Gas (B) turns K2Cr2O7 green and also lime water milky. Identify (A) ?

A
Na2O
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B
Na2SO3
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C
Na2SO4
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D
None of these
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Solution

The correct option is B Na2SO3
The sodium salt of dibasic acid is Na2SO3. It reacts with HCl to form SO2 gas.

Na2SO3 HCl NaCl+H2O+SO2(gas)

Gas SO2 turns K2Cr2O7 green and also turns lime water milky.
3SO2+K2Cr2O7+H2SO4K2SO4+Cr2(SO4)3(green)+H2O

Option (B) is correct.

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