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When a mixtur...

Question

When a mixture $(A)$ of unknown gases is passed into the dichromate solution, then orange color turns to green; when the solution is boiled and gas passed into lime water, then lime water turns milky. Find out $(A)$ .

A

C O_{2}

,

C l_{2}

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B

H_{2} S

,

C O_{2}

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C

Both (A) and (B)

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D

None of these

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Solution

The correct option is B $H_{2} S$ , $C O_{2}$
The mixture is of $H_{2} S, C O_{2}$ . When $H_{2} S$ gas is passed into the dichromate solution, then orange color turns to green. The hydrogen sulphide gas reduces the orange color of dichromate ions into green color chromium(III) ions.
$C O_{2}$ gas turns lime water milky.

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