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 yellowise precipitate (D). the substance (D) burns in air to produce a gas (E) which also can change the colour of K_(2)Cr_(2)O_(7) solution. Q. "A" probably, is

Answer»

`ZnSO_(3)`
`CoS`
`MnS`
`NiS`

Solution :`underset((A)" Pink/Buff")(MnS)+underset((dil)" colour")(H_(2)SO_(4))to underset((B)"COLOURLESS")(H_(2)S(g))+underset((C)" colourless")(MnSO_(4))`
`K_(2)Cr_(2)O_(7)+4H_(2)SO_(4)+3H_(2)S to K_(2)SO_(4) + underset((green))(Cr_(2)(SO_(4))_(3))+underset((yellow)(D))(3S)darr`
`S+O_(2)tounderset((E))(SO_(2))`
`K_(2)Cr_(2)O_(7)+H_(2)SO_(4)+3SO_(2)toK_(2)SO_(4)+underset((green))(Cr_(2)(SO_(4))_(3))+H_(2)O`
`underset((B))(2H_(2))S+underset((E))(SO_(2))tounderset((D))(3S)darr+2H_(2)O`
`Na_(2)SO_(3)+StoNa_(2)S_(2)O_(3)`

hypo solution is used as an ANTICHLOR to remove excess of `Cl_(2)` from bleached articles.
`Na_(2)S_(2)O_(3)+Cl_(2)+H_(2)O to Na_(2)SO_(4)+S+2HCl`
`2MN^(2+)+5PbO_(2)+4H^(+) to underset("violet red")(2MnO_(4)^(-))+5Pb^(+2)+2H_(2)O`


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