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JEE CHEMISTRY MCQ: SOME BASIC CONCEPTS OF CHEMISTRY

1 Medium

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Analyzing +4 | -1

A gas mixture contains

\mathrm{CH}_4

and

\mathrm{C}_3 \mathrm{H}_6.

When this mixture undergo cracking into

\mathrm{C}(\mathrm{s})

and

\mathrm{H}_2(\mathrm{g}),

the total number of moles of

\mathrm{H}_2(\mathrm{g})

obtained is 42. If the total volume of the initial gas mixture at

1.5 \mathrm{~atm}

and

27^{\circ} \mathrm{C}

246.0 \mathrm{~L},

then what is the mole per cent of

\mathrm{CH}_4

gas in the initial mixture?

View answer and explanation

Correct option: A

20 \%

Option A (20%) is correct because by setting up and solving a system of equations based on the cracking reactions and the ideal gas law, the mole percent of CH4 is found to be 20%.

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If a mixture containing 3 moles of hydrogen and 1 mole of nitrogen is converted completely into ammonia, the ratio of initial and final volumes under the same temperature and pressure would be: How many g are present in one mole of Ag? 8 g of NaOH is dissolved in 18 g of

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mol\,\,k{g^{ - 1}})

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