1.

H_(2)S gas is not evolved when SO_(3)^(2-) ion reacts with following reagents.

Answer»

An+dil.`H_(2)SO_(4)`
Al + conc. NaOH
Al + dil. HCl
None of these

Solution :`SO_(3)^(2-)+2Al+2OH^(-)+3H_(2)OrarrS^(2-)+2[Al(OH)_(4)]^(-)`
`H_(2)S` does not evolve as LIBERATED `H_(2)S` is neutralised by NaOH and `Na_(2)S` is FORMED.


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