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8.3. Organic chemistry purification and characterization — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry8.3. Organic chemistry purification and characterization1 Mark
MCQ
Kjeldahl's method was used for the estimation of nitrogen in an organic compound. The ammonia evolved from $0.55\, g$ of the compound neutralised $12.5\, mL$ of $1\, M \,H _{2} SO _{4}$ solution. The percentage of nitrogen in the compound is $.....$ (Nearest integer)
  • A
    $1$
  • B
    $84$
  • C
    $32$
  • ✓
    $64$
✓

Answer

Correct option: D.
$64$
d
Meq of $H _{2} SO _{4}$ used by $NH _{3}=12.5 \times 1 \times 2=25$

$\%$ of $N$ in the compound $=\frac{25 \times 10^{-3} \times 14 \times 100}{0.55}=63.6$

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