1.

Which of the following reagents are used to give blue ring test of solution of Na_(2)S_(2)O_(3)?

Answer»

`(NH_(4))_(2)MoO_(4)`
`CuSO_(4)`
CONC. `H_(2)SO_(4)`
`[Ni(EN)_(3)] (NO_(3))_(2)`

Answer :A::C


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