JEE Main 2022 · 27 Jun · Shift 2 · Chemistry Q81

← JEE Main 2022 · 27 Jun · Shift 2

ChemistryInteger+4 / -1Question 81 of 90

116 g of a substance upon dissociation reaction, yields 7.5 g of hydrogen, 60 g of oxygen and 48.5 g of carbon. Given that the atomic masses of H, O and C are 1, 16 and 12, respectively. The data agrees with how many formulae of the following ? ______.

A. $\mathrm{CH_3COOH}$ B. HCHO C. $\mathrm{CH_3OOCH_3}$ D. $\mathrm{CH_3CHO}$

Your answer

Answer and worked solution

Official answer: 2

Moles. H 7.5, O 3.75, C 4.04: close to C : H : O = 1 : 2 : 1, the empirical formula $\mathrm{CH_2O}$ .

Matches. $\mathrm{CH_3COOH}$ ( $\mathrm{C_2H_4O_2}$ ) and HCHO. ( $\mathrm{CH_3OOCH_3}$ and $\mathrm{CH_3CHO}$ do not fit.) So 2.

Answer: 2

Topics:Empirical and molecular formula

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JEE Main 2022 · 27 Jun · Shift 2, Chemistry question 81