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Percentage of nitrogen by Dumas method from the volume of nitrogen collected

This type of question, asked 7 times: 14 Jun 2022, 28 Jul 2022, 2 Apr 2025, 3 Apr 2025, 4 Apr 2025, 7 Apr 2025, 24 Jan 2026 S1. All 8 questions below, oldest first.

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  1. Question 1

    14 Jun 2022

    148
    0.2 g0.2\text{ }g of an organic compound was subjected to estimation of nitrogen by Dumas method in which volume of N2N_{2} evolved (at STP) was found to be 22.400 mL22.400\text{ }mL. The percentage of nitrogen in the compound is [nearest integer] (Given: Molar mass of N2N_{2} is 28 g mol−128\text{ }g\text{ }mol^{-1}. Molar volume of N2N_{2} at STP: 22.4 L22.4\text{ }L)

  2. Question 2

    28 Jul 2022

    146
    A sample of 0.125 g0.125\text{ }g of an organic compound when analysed by Dumas' method yields 22.78 mL22.78\text{ }mL of nitrogen gas collected over KOHKOH solution at 280 K280\text{ }K and 759 mmHg759\text{ }mmHg. The percentage of nitrogen in the given organic compound is _____ (Nearest integer). (a) The vapour pressure of water at 280 K280\text{ }K is 14.2 mmHgmmHg (b) R=0.082 L atm K−1 mol−1R = 0.082\text{ }L\text{ }atm{\text{ }K}^{- 1}{\text{ }mol}^{- 1}

  3. Question 3

    2 Apr 2025

    120
    In Dumas' method for estimation of nitrogen, 0.5 gram of an organic compound gave 60 mL of nitrogen collected at 300 K temperature and 715 mm Hg pressure. The percentage composition of nitrogen in the compound (Aqueous tension at 300 K=15 mmHg300\text{ }K = 15\text{ }mmHg ) is.

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  4. Question 4

    3 Apr 2025

    46
    During estimation of nitrogen by Dumas' method of compound X(0.42 g)X(0.42\text{ }g) : _________\_\_\_\_\_\_\_\_\_ mL of N2N_{2} gas will be liberated at STP. (nearest integer) (Given molar mass in gmol−1:C:12,H:1g{mol}^{- 1}:C:12,H:1, N:14)N:14)

  5. Question 5

    3 Apr 2025

    111
    In Dumas' method for estimation of nitrogen 0.4 g of an organic compound gave 60 mL of nitrogen collected at 300 K temperature and 715 mm Hg pressure. The percentage composition of nitrogen in the compound is (Given : Aqueous tension at 300 K=15 mmHg300\text{ }K = 15\text{ }mmHg )

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  6. Question 6

    4 Apr 2025

    46
    In Dumas' method for estimation of nitrogen 1 g of an organic compound gave 150 mL of nitrogen collected at 300 K temperature and 900 mm Hg pressure. The percentage composition of nitrogen in the compound is % (nearest integer). (Aqueous tension at 300 K=15 mmHg300\text{ }K = 15\text{ }mmHg )

  7. Question 7

    7 Apr 2025

    122
    In Dumas' method 292 mg of an organic compound released 50 mL of nitrogen gas (N2)\left( N_{2} \right) at 300 K temperature and 715 mm Hg pressure. The percentage composition of ' N ' in the organic compound is % (Nearest integer) (Aqueous tension at 300 K=15 mmHg300\text{ }K = 15\text{ }mmHg )

  8. Question 8

    24 Jan 2026 S1

    49
    In Dumas method for estimation of nitrogen, 0.50 g of an organic compound gave 70 mL of nitrogen collected at 300 K and 715 mm pressure. The percentage of nitrogen in the organic compound is ____\_\_\_\_ % (Aqueous tension at 300 K is 15 mm ).