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Quantitative estimation of carbon, hydrogen, nitrogen, halogens, sulphur and phosphorus: NEET MCQs with answers

90 questions on this topic of Purification and Characterisation of Organic Compounds (NEET 2027 syllabus). Here are 12; tap one to see its answer and explanation.

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1. In Carius estimation, 0.2 g of an organic compound gave 0.404 g of AgCl. The percentage of chlorine in the compound is:

  1. 16.4 %
  2. 100 %
  3. 25 %
  4. 50 %
Show answer and explanation

Answer: (D) 50 %

%chlorine = (35.5/143.5) × (0.404/0.2) × 100 = 50%.

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2. In Carius estimation, 0.25 g of an organic compound gave 0.235 g of AgBr. The percentage of bromine in the compound is:

  1. 29.6 %
  2. 40 %
  3. 20 %
  4. 60 %
Show answer and explanation

Answer: (B) 40 %

%bromine = (80/188) × (0.235/0.25) × 100 = 40%.

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3. On complete combustion, 0.5 g of an organic compound gave 0.55 g of CO₂. The percentage of carbon in the compound is:

  1. 21.8 %
  2. 15 %
  3. 70 %
  4. 30 %
Show answer and explanation

Answer: (D) 30 %

%C = (12/44) × (mass of CO₂/mass of compound) × 100 = (12/44) × (0.55/0.5) × 100 = 30%.

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4. In Carius estimation, 0.15 g of an organic compound gave 0.333 g of AgCl. The percentage of chlorine in the compound is:

  1. 18.1 %
  2. 27.5 %
  3. 55 %
  4. 45 %
Show answer and explanation

Answer: (C) 55 %

%chlorine = (35.5/143.5) × (0.333/0.15) × 100 = 55%.

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5. In Kjeldahl's method, the ammonia evolved from 0.75 g of an organic compound neutralised 25 mL of 0.1 N H₂SO₄. The percentage of nitrogen in the compound is:

  1. 4.67 %
  2. 9.33 %
  3. 2.33 %
  4. 1.31 %
Show answer and explanation

Answer: (A) 4.67 %

%N = 1.4 × N × V/m = 1.4 × 0.1 × 25/0.75 = 4.67%.

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6. In Carius estimation, 0.15 g of an organic compound gave 0.123 g of AgBr. The percentage of bromine in the compound is:

  1. 35 %
  2. 17.5 %
  3. 25.9 %
  4. 65 %
Show answer and explanation

Answer: (A) 35 %

%bromine = (80/188) × (0.123/0.15) × 100 = 35%.

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7. On complete combustion, 0.2 g of an organic compound gave 0.623 g of CO₂. The percentage of carbon in the compound is:

  1. 42.5 %
  2. 15 %
  3. 61.8 %
  4. 85 %
Show answer and explanation

Answer: (D) 85 %

%C = (12/44) × (mass of CO₂/mass of compound) × 100 = (12/44) × (0.623/0.2) × 100 = 85%.

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8. On complete combustion, 0.25 g of an organic compound gave 0.458 g of CO₂. The percentage of carbon in the compound is:

  1. 25 %
  2. 50 %
  3. 36.4 %
  4. 100 %
Show answer and explanation

Answer: (B) 50 %

%C = (12/44) × (mass of CO₂/mass of compound) × 100 = (12/44) × (0.458/0.25) × 100 = 50%.

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9. In Kjeldahl's method, the ammonia evolved from 0.25 g of an organic compound neutralised 10 mL of 1 N H₂SO₄. The percentage of nitrogen in the compound is:

  1. 56 %
  2. 28 %
  3. 1.75 %
  4. 84 %
Show answer and explanation

Answer: (A) 56 %

%N = 1.4 × N × V/m = 1.4 × 1 × 10/0.25 = 56%.

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10. On complete combustion, 0.3 g of an organic compound gave 0.77 g of CO₂. The percentage of carbon in the compound is:

  1. 35 %
  2. 30 %
  3. 70 %
  4. 50.9 %
Show answer and explanation

Answer: (C) 70 %

%C = (12/44) × (mass of CO₂/mass of compound) × 100 = (12/44) × (0.77/0.3) × 100 = 70%.

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11. In Carius estimation, 0.15 g of an organic compound gave 0.106 g of AgBr. The percentage of bromine in the compound is:

  1. 70 %
  2. 22.2 %
  3. 30 %
  4. 15 %
Show answer and explanation

Answer: (C) 30 %

%bromine = (80/188) × (0.106/0.15) × 100 = 30%.

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12. On complete combustion, 0.2 g of an organic compound gave 0.55 g of CO₂. The percentage of carbon in the compound is:

  1. 54.5 %
  2. 25 %
  3. 37.5 %
  4. 75 %
Show answer and explanation

Answer: (D) 75 %

%C = (12/44) × (mass of CO₂/mass of compound) × 100 = (12/44) × (0.55/0.2) × 100 = 75%.

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