The average molar mass of air becomes more in presence of which gas if present in air :

H_{2}

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N_{2}

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C_{2} H_{6}

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C H_{4}

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Solution

The correct option is C $C_{2} H_{6}$
Molar mass of air is $28.80$ and among given gases, only $C_{2} H_{6}$ is heavier than air. So, it will increase the average molar mass of air.

Hence the correct option is C.

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{C H}_{4}, C_{2} H_{6}

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I I

C_{2} H_{4} + H_{2} ⇌ C_{2} H_{6}

(Δ H = - 32.7 k c a l)

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C_{2} H_{4} + H_{2} ⇌ C_{2} H_{6} [Δ H^{o} = - 136.8 k J {m o l}^{- 1}]

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{C H}_{4}, C_{2} H_{4}, C_{2} H_{6}, C_{2} H_{2}

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