JEE Main 2014 · 11 Apr · Shift 1 · Chemistry Q45

← JEE Main 2014 · 11 Apr · Shift 1

ChemistrySingle correct+4 / -1Question 45 of 90

A gaseous compound of nitrogen and hydrogen contains 12.5% (by mass) of hydrogen. The density of the compound relative to hydrogen is 16. The molecular formula of the compound is :

\ce{NH2}

\ce{N3H}

\ce{NH3}

\ce{N2H4}

Answer and worked solution

Official answer: D

Mass ratio N : H is 87.5 : 12.5, i.e. moles $6.25:12.5=1:2$ , so the empirical formula is $\ce{NH2}$ (16). The molar mass is $2\times16=32$ , giving $\ce{N2H4}$ .

Topics:Empirical and molecular formula

← Previous question Next question →

JEE Main 2014 · 11 Apr · Shift 1, Chemistry question 45