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Zinc on reaction with NaOH gives a salt ...

Zinc on reaction with NaOH gives a salt (A) alongwith a gas (B). (A) on reaction with `H_(2)S` gas gives a white precipitate (C ). Identify (A), (B) and (C ).

Text Solution

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`Zn+NaOH rarr underset((A))(Na_(2)ZnO_(2))+underset((B))(H_(2))`
`Na_(2)ZnO_(2)+H_(2)S rarr underset(("white ppt."))underset("Zinc sulphide")underset((C ))(ZnS darr) + 2NaOH`
Hence, (A) is `Na_(2)ZnO_(2)` (sodium zincate), (B) is `H_(2)` (hydrogen gas) and (C ) is ZnS (zinc sulphide).
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