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Question

An aqueous solution of a gas (X) gives the following reactions :
(i) It turns an acidified K2Cr2O7 solution green.
(ii) On boiling it with H2O2, cooling it and then adding an aqueous solution of BaCl2, a precipitate insoluble in dilute hydrochloric acid is obtained.
(iii) On passing H2S in the solution a white turbidity is obtained.
Identify (X).

A
SO2
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B
CO2
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C
SiO2
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D
None of the above
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Solution

The correct option is A SO2
The compound (X) is SO2 gas.

(i) It reduces Cr(VII) to Cr(III) and hence, the solution turns green.
3SO2+Cr2O27+2H+2Cr3++H2O+3SO24

(ii) On boiling sulphur dioxide with hydrogen peroxide, sulphate ions are formed which combines with barium ions to form white precipitate of barium sulphate.

SO2+H2O2SO24+2H+

SO24+Ba2+BaSO4

(iii) Sulphur dioxide gas reacts with hydrogen sulphide to form white turbidity of S.
2H2S+SO23S+2H2O

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