Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main2018ChemistrySome Basic Concepts of ChemistryActual

The ratio of mass percent of C and H of an organic compound C X H Y O Z is 6 : 1 . If one molecule of the above compound C X H Y O Z contains half as much oxygen as required to burn one molecule of compound C X H Y completely to CO 2 and H 2 O . The empirical formula of the compound C X H Y O Z is

Options

  1. AC 2 H 4 O 3
  2. BC 3 H 6 O 3
  3. CC 2 H 4 O
  4. DC 3 H 4 O 2

Correct answer

A. C 2 H 4 O 3

Step-by-step solution

Mass of C : Mass of H = 6   :   1 . Or, for every atom of C   ( 12   u ) , we have 2   atoms of H   ( 1 u   ×   2 = 2 u ) Thus, the ratio of atoms of C   :   H = x   :   y = 1   :   2 Thus, the formula is: C x H 2 x O z Combustion of C x H 2 x : C x H 2 x + ( 3 x / 2 ) O 2 → xCO 2 + xH 2 O Hence, the combustion of C x H 2 x requires ( 3 x / 2 ) oxygen molecules. Hence, the original molecule contains ( 3 x / 4 )   molecules = ( 3 x

Practice Some Basic Concepts of Chemistry on Quantrex Academy →

More from Some Basic Concepts of Chemistry

Match List-I with List-II. List-I Mass of substance List-II Number of atoms A. 1.8 mg water I. 2 10⁻⁴ N_A B. 9.8 mg sulphuric acid II. 1.5 10⁻⁴ N_A C. 1.8 mg carbon III. 3 10⁻⁴ N_A 2026Which of the following contain the same number of atoms ? (Given : Molar mass in g mol ⁻¹ of H, He, O and S are 1, 4, 16 and 32 respectively) A. 2 g of O₂ gas B. 4 g of SO₂ gas C. 2026An oxide of iron contains 69.9 % iron, its empirical formula, is: (Given: Molar mass of Fe and O are 56 and 16 g mol ⁻¹ respectively.) 2026What volume of hydrogen gas at STP would be liberated by action of 50 mL of H₂SO₄ of 50 % purity (density = 1.3 g mL ⁻¹ ) on 20 g of zinc ? Given : Molar mass of H, O, S, Zn are 1, 2026How many grams of residue is obtained by heating 2.76 g of silver carbonate? (Given: Molar mass of C, O and Ag are 12 , 16 and 108 g mol ⁻¹ respectively) 2026The correct order of total number of atoms present in (A) 2 moles of cyclohexane (B) 684 g of sucrose (C) 90.8 L of dihydrogen at STP is: 2026Number of moles and number of molecules in 1.4187 L of SO₂ at STP respectively are: 2026The ratio of mass percentage (w/w) of C : H in a hydrocarbon is 12 : 1 . It has two carbon atoms. The weight (in g) of CO₂(g) formed when 3.38 g of this hydrocarbon is completely b 2026 Full Some Basic Concepts of Chemistry list All JEE Main PYQs