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Q.

H2S gas is not evolved when SO32- ion reacts with following reagents.

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a

Zn+dil.H2SO4

b

Al+ Conc. NaOH

c

Al+ dil. HCl

d

None of these

answer is B.

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Detailed Solution

SO32-+2Al+2OH-+3H2O⟶S2-+2Al(OH)4-H2S does not evolve as liberated H2S is neutralized by NaOH and Na2S is formed.
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H2S gas is not evolved when SO32- ion reacts with following reagents.