1.

A coloured compound (A) reacts with dilute H_(2)SO_(4) to produce a colourless gas (B) and colourless solution (C). The reaction between (B) and the acidified K_(2)Cr_(2)O_(7) solution produces a green solution and a slightly yellowish precipitate (D). the substance (D) burns in air to produce a gas (E) which also cann change the colour of K_(2)Cr_(2)O_(7) solution. Q. "A" probably, is:

Answer»

`ZnSO_(3)`
`COS`
`MnS`
`NIS`

SOLUTION :


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