JEE Main 2026 · 2 Apr · Shift 2 · Physics Q34

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PhysicsSingle correct+4 / -1Question 34 of 75

A mixture of carbon dioxide and oxygen has volume 8310 cm³, temperature 300 K, pressure 100 kPa and mass 13.2 g. The number of moles of carbon dioxide and oxygen gases in the mixture respectively are ________.
(Assume both carbon dioxide and oxygen gases behave like ideal gases) [ $R=8.31$ J/mol.K]

0.15 and 0.18

0.25 and 0.08

0.21 and 0.12

0.13 and 0.20

Answer and worked solution

Official answer: C

Total moles. $n=\dfrac{PV}{RT}=\dfrac{10^5\times8.31\times10^{-3}}{8.31\times300}=\dfrac13$ mol.

Mass equation. $44a+32\left(\frac13-a\right)=13.2$ gives $a=0.21$ mol $\ce{CO2}$ and $b=0.12$ mol $\ce{O2}$ .

(C)

Topics:Ideal gas equation

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JEE Main 2026 · 2 Apr · Shift 2, Physics question 34