JEE Main 2022 — Chemistry Physical Chemistry

2022integerhard

On complete combustion $0.30g$ of an organic compound gave $0.20g$ of carbon dioxide and $0.10g$ of water. The percentage of carbon in the given organic compound is____(Nearest Integer)

Official previous-year question

Held on 26 Jun 2022 · Verified 6 Jul 2026.

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Solution

${C}_{x}{H}_{y}{O}_{z}+(x+\frac{y}{4}-\frac{z}{2}){O}_{2}\rightarrow {\mathrm{xCO}}_{2}+\frac{y}{2}{H}_{2}O \begin{matrix}0.3g & 0.2g & 0.1g\end{matrix}$

$\frac{{\mathrm{CO}}_{2}n}{{H}_{2}On}=\frac{x}{\frac{y}{2}}=\frac{\frac{0.2}{44}}{\frac{0.1}{18}}=\frac{9}{11}$

$x=\frac{9y}{22}$

Now, $\frac{{C}_{x}{H}_{y}{O}_{2}n}{{\mathrm{CO}}_{2}n}=\frac{1}{x}$

$\Rightarrow \frac{0.3}{12x+y+16z}\times \frac{44}{0.2}=\frac{1}{x}$

$66x=12x+y+16z 54x=y+16z$

$\frac{54\times 9y}{22}–y=16z$

$z=\frac{29y}{22}$

$\mathrm{CxHyOz}= {C}_{\frac{9y}{22}}{H}_{y}{O}_{\frac{29y}{22}} ={C}_{9}{H}_{22}{O}_{29}$

$%\mathrm{of}C=\frac{12\times 9}{(12\times 9+22+29\times 16)}\times 100=18.18%$

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JEE Main 2022 — Chemistry Physical Chemistry

2022integerhard

On complete combustion $0.30g$ of an organic compound gave $0.20g$ of carbon dioxide and $0.10g$ of water. The percentage of carbon in the given organic compound is____(Nearest Integer)

Official previous-year question

Held on 26 Jun 2022 · Verified 6 Jul 2026.

Did you get this right?

Solution

${C}_{x}{H}_{y}{O}_{z}+(x+\frac{y}{4}-\frac{z}{2}){O}_{2}\rightarrow {\mathrm{xCO}}_{2}+\frac{y}{2}{H}_{2}O \begin{matrix}0.3g & 0.2g & 0.1g\end{matrix}$

$\frac{{\mathrm{CO}}_{2}n}{{H}_{2}On}=\frac{x}{\frac{y}{2}}=\frac{\frac{0.2}{44}}{\frac{0.1}{18}}=\frac{9}{11}$

$x=\frac{9y}{22}$

Now, $\frac{{C}_{x}{H}_{y}{O}_{2}n}{{\mathrm{CO}}_{2}n}=\frac{1}{x}$

$\Rightarrow \frac{0.3}{12x+y+16z}\times \frac{44}{0.2}=\frac{1}{x}$

$66x=12x+y+16z 54x=y+16z$

$\frac{54\times 9y}{22}–y=16z$

$z=\frac{29y}{22}$

$\mathrm{CxHyOz}= {C}_{\frac{9y}{22}}{H}_{y}{O}_{\frac{29y}{22}} ={C}_{9}{H}_{22}{O}_{29}$

$%\mathrm{of}C=\frac{12\times 9}{(12\times 9+22+29\times 16)}\times 100=18.18%$

Your note

JEE Main Physical Chemistry in other years

Keep practicing Physical Chemistry

Work through every JEE Main Physical Chemistry PYQ, year by year.

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JEE Main 2022 — Chemistry Physical Chemistry

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Solution

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JEE Main Physical Chemistry in other years

More JEE Main Physical Chemistry questions

Other Chemistry topics for JEE Main

Organic Chemistry

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JEE Main 2022 — Chemistry Physical Chemistry

Did you get this right?

Solution

Your note

JEE Main Physical Chemistry in other years

More JEE Main Physical Chemistry questions

Other Chemistry topics for JEE Main

Organic Chemistry

Inorganic Chemistry

Keep practicing Physical Chemistry