A mixture of H_2 and O_2 is very stable at ro | vedclass

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(C) The reaction between $H_2$ and $O_2$ to form $H_2O$ has a very high activation energy $(E_a)$.At room temperature,the number of molecules possessi

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The $E_a$ of the reaction is very high. The number of energetic molecules increases significantly in the high-temperature range of the spark.

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(C) The reaction between $H_2$ and $O_2$ to form $H_2O$ has a very high activation energy $(E_a)$.At room temperature,the number of molecules possessing energy greater than $E_a$ is negligible,making the mixture stable.When a spark is provided,it supplies the necessary activation energy to a small number of molecules,initiating the reaction.Since the reaction is highly exothermic,the heat released provides energy to more molecules,leading to a chain reaction and an explosion.Thus,the spark increases the number of energetic molecules significantly.

$Case$	$E_a \ (kcal/mol)$	$Temp. \ Change \ (K)$
$I$	$40$	$200 - 210$
$II$	$80$	$200 - 210$
$III$	$40$	$300 - 310$
$IV$	$80$	$300 - 310$

$A$ mixture of $H_2$ and $O_2$ is very stable at room temperature. However,it explodes immediately upon sparking. This is because .........

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