Gaseous benzene reacts with hydrogen gas in presence of a nickel catalyst to form gaseous cyclohexane according to the reaction: $\mathrm{C}_6 \mathrm{H}_{6(9)}+3 \mathrm{H}_{2(9)} \longrightarrow \mathrm{C}_6 \mathrm{H}_{12(9)}$ A mixture of $\mathrm{C}_6 \mathrm{H}_6$ and excess $\mathrm{H}_2$ has a pressure of $60 \mathrm{~mm}$ of $\mathrm{Hg}$ in an unknown volume. After the gas has been passed over a nickel catalyst and all the benzene converted to cyclohexane, the pressure of the gas was $30 \mathrm{~mm}$ of $\mathrm{Hg}$ in the same volume and temperature. The fraction of $\mathrm{C}_6 \mathrm{H}_5$ (by volume) present in the original volume is:

NEET UG CHEMISTRY MCQ: STATES OF MATTER

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Gaseous benzene reacts with hydrogen gas in presence of a nickel catalyst to form gaseous cyclohexane according to the reaction:

\mathrm{C}_6 \mathrm{H}_{6(9)}+3 \mathrm{H}_{2(9)} \longrightarrow \mathrm{C}_6 \mathrm{H}_{12(9)}

A mixture of

\mathrm{C}_6 \mathrm{H}_6

and excess

\mathrm{H}_2

has a pressure of

60 \mathrm{~mm}

\mathrm{Hg}

in an unknown volume. After the gas has been passed over a nickel catalyst and all the benzene converted to cyclohexane, the pressure of the gas was

30 \mathrm{~mm}

\mathrm{Hg}

in the same volume and temperature. The fraction of

\mathrm{C}_6 \mathrm{H}_5

(by volume) present in the original volume is:

View answer and explanation

Correct option: D

1 / 6

Option D (1/6) is correct because it represents the fraction of benzene in the original mixture, calculated from the pressure change after the reaction.

NEET UG CHEMISTRY MCQ: STATES OF MATTER

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