p-Block elementsHard

Question

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

Options

A.Zn + dil. H2SO4
B.Al + Conc.NaOH
C.Al + dil.HCl
D.None of these

Solution

SO32- + 2Al + 2OH- + 3H2O → S2 + [Al(OH)4]-
H2S does not evolve as librated H2S is neutralized by NaOH and Na 2S is formed.

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