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Effect on Indicators by Acids and Bases

A hydrocarbon...

Question

A hydrocarbon gas decolourises alkaline potassium permanganate and gives precipitate with ammonical silver nitrate. The gas is :

{C H}_{4}

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C_{2} H_{4}

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C_{2} H_{2}

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C_{2} H_{6}

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Solution

The correct option is B $C_{2} H_{2}$
$C_{2} H_{2}$ ; acetylene is an alkyne and thus forms precipitate with ammonical silver nitrate solution( tollen's reagent). Also alkynes decolourises alkaline potassium permanganate solution.

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