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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
The percentage composition of carbon by mole in methane is ........... $\%$
  • A
    $80$
  • ✓
    $20$
  • C
    $75$
  • D
    $25$
✓

Answer

Correct option: B.
$20$
b
In $CH_4$

Mole of carbon $n_C = 1$

Mole of hydrogen $= n_H = 4$

$\%$ of $n_C$ $ = \frac{{{n_C}}}{{{n_C} + {n_H}}} \times 100 = \frac{1}{5} \times 100 = 20\% $

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