JEE Main 2026 · 2 Apr · Shift 1 · Chemistry Q73

← JEE Main 2026 · 2 Apr · Shift 1

ChemistryInteger+4 / -1Question 73 of 75

One mole of an alkane ( $x$ ) requires 8 mole oxygen for complete combustion. Sum of number of carbon and hydrogen atoms in the alkane ( $x$ ) is ________.

Your answer

Answer and worked solution

Official answer: 17

Combustion of $\ce{C_nH_{2n+2}}$ needs $\frac{3n+1}2$ mol $\ce{O2}$ . Setting $\frac{3n+1}2=8$ gives $n=5$ .

Alkane $\ce{C5H12}$ : $5+12=17$ atoms.

Answer: 17

Topics:Alkanes Stoichiometry

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JEE Main 2026 · 2 Apr · Shift 1, Chemistry question 73