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Duma's Method MCQ - Practice Questions with Answers

Edited By admin | Updated on Sep 25, 2023 25:24 PM | #NEET

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  • Duma's Method is considered one the most difficult concept.

  • 4 Questions around this concept.

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QuestionMEDIUM

In Duma's method for estimation of nitrogen, 0.25 g of an organic compound gave 40 mL of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 K is 25 mm, the percentage of nitrogen in the compound is :

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Concepts Covered - 1

Duma's Method

The nitrogen containing organic compound, when heated with copper oxide in an atmosphere of carbon dioxide, yields free nitrogen in addition to carbon dioxide and water.

{\mathrm{C}_{\mathrm{x}} \mathrm{H}_{\mathrm{y}} \mathrm{N}_{\mathrm{z}}+(2 \mathrm{x}+\mathrm{y} / 2) \mathrm{CuO} \longrightarrow} {\: \mathrm{x} \mathrm{CO}_{2}+\mathrm{y} / 2 \mathrm{H}_{2} \mathrm{O}+\mathrm{z} / 2 \mathrm{N}_{2}+(2 \mathrm{x}+\mathrm{y} / 2) \mathrm{Cu}}
Traces of nitrogen oxides formed, if any, are reduced to nitrogen by passing the gaseous mixture over a heated copper gauze. The mixture of gases so produced is collected over an aqueous solution of potassium hydroxide which absorbs carbon dioxide. Nitrogen is collected in the upper part of the graduated tube as shown in the figure.
Let the mass of organic compound = mg
Volume of nitrogen collected = V1 mL
Room temperature = T1K

\text { Volume of nitrogen at } \mathrm{STP}=\frac{p_{1} V_{1} \times 273}{760 \times T_{1}}
Where p1 and V1 are the pressure and volume of nitrogen, p1 is different from the atmospheric pressure at which nitrogen gas is collected. The value of p1 is obtained by the relation;
p1 = Atmospheric pressure – Aqueous tension
22400 mL N2 at STP weighs 28g.

\begin{array}{l}{V \mathrm{\: mL\: } \mathrm{N}_{2} \text { at STP weighs }=\frac{28 \times V}{22400} \mathrm{g}} \\\\ {\text {Percentage of nitrogen }=\frac{28 \times V \times 100}{22400 \times m}}\end{array}

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Duma's Method

Study other Related Concepts

Duma's Method Current Topic

Organic Compounds - Classification Of Organic Compounds
Purification of Organic Compounds
Functional Groups
Qualitative Analysis of Organic Compounds
Homologous Series
Lassaigne’s Test - Test for Nitrogen, Sulphur, Halogens
IUPAC Nomenclature of Organic Chemistry
Duma's Method
Isomerism
Kjeldahl's Method

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Duma's Method

Chemistry Part II Textbook for Class XI

Page No. : 364

Line : 19

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