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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3mc183

Compound X has C, H and O by mass and molar mass . Glucose is (C = 12, H = 1, O = 16). Select the correct statement(s).

  1. A of X contain of H atoms.
  2. BX and glucose have the same percentage composition.
  3. CThe molecular formula of X is .
  4. DThe empirical formula of X is .

Answer: B, C, D

C : H : O = 3.33 : 6.67 : 3.33 = 1 : 2 : 1, so empirical formula CH2O (mass 30), and 60/30 = 2 gives C2H4O2. Glucose is (CH2O)6, so the percentage composition is identical. 6 g of X = 0.1 mol, which has 0.4 mol H atoms, not 0.2.
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