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Duma's Method - (Concept)
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.
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
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.
| Exam | Chapter |
| JEE MAIN | Purification and Characterisation of Organic Compounds |
According to Duma's method percentage of N in an organic compound can be calculated by:
| A. |
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| B. |
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| C. |
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| D. |
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An organic compound is estimated through Dumas method and was found to evolve 6 moles of , 4 moles of
and 1 mole of nitrogen gas . The formula of the compound is:
| A. |
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| B. |
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| C. |
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| D. |
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In Duma's method of estimation of nitrogen, 0.1840g of organic compound gave 30 mL of nitrogen collected at 287 K and 758nmn of Hg pressure. The percentage composition of nitrogen in the compound is _________ (Rounded off to the nearest integer)
| A. |
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| B. |
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| C. |
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| D. |
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0.2 g of an organic compound was subjected to estimation of nitrogen by Dumas method in which the volume of , evolved (at STP) was found to be 22.400 mL. The percentage of nitrogen in the compound is________[nearest integer] (Given: Molar mass of
, is
Molar volume of
at STP: 22.4L )
| A. |
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| B. |
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| C. |
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| D. |
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A sample of 0.125 g of an organic compound when analyzed by Duma's method yields 22.78 mL of nitrogen gas collected over the solution at 280 K and 759 mm of Hg. The percentage of nitrogen in the given organic compound is _____________
(Nearest integer)
Given :
(a) The vapor pressure of water of 280 K is 14.2 mm of Hg.
(b)
| A. |
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| B. |
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| C. |
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| D. |
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The number of moles of , that will be utilized in Dumas method for estimating nitrogen in a sample of
of N,N-dimethylaminopentane is ________
. (Nearest integer)
| A. |
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| B. |
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| C. |
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| D. |
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The transformation occurring in Duma's method is given below
The value of is____________ .(Integer answer)
| A. |
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| B. |
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| C. |
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| D. |
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In Dumas method for the estimation of N2, the sample is heated with copper oxide and the gas evolved is passed over :
| A. |
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| B. |
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| C. |
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| D. |
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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.
