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1. Some basic concept of chemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry1. Some basic concept of chemistry1 Mark
MCQ
An organic compound contains $78 \,\%$ (by $wt.$) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is : [Atomic wt. of $\mathrm{C}$ is $12, \mathrm{H}$ is 1$]$
  • A
    $\mathrm{CH}$
  • B
    $\mathrm{CH}_{2}$
  • ✓
    $\mathrm{CH}_{3}$
  • D
    $\mathrm{CH}_{4}$
✓

Answer

Correct option: C.
$\mathrm{CH}_{3}$
c
$C \quad 78 \quad \frac{78}{12}=6.5 \quad \frac{6.5}{6.5}=1$

$H \quad 22 \quad \frac{22}{1}=22 \quad \frac{22}{6.5}=3.38=3$

Emperical formula $=\mathrm{CH}_{3}$

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