JEE Main2013ChemistrySome Basic Concepts of ChemistryActual

Number of atoms in the following samples of substances is largest in:

Options

A4.0 ~g of hydrogen
B71.0 ~g of chlorine
C127.0 ~g of iodine
D48.0 ~g of magnesium

Correct answer

A. 4.0 ~g of hydrogen

Step-by-step solution

4 ~g of hydrogen =4 mole of hydrogen =4 6.023 10²³ atoms aligned & 71.0 gm of chlorine = 71.0 71.0 =1 moles of & chlorine & 127 gm of iodine = 1 2 mole of ₂ & = 127 254 =6.023 10²³ atoms & 48.0 gm of magnesium & = 48.0 24.0 =2 6.023 10²³ 1 2 atoms & 4.0 gm H ₂ has largest number of atoms. aligned

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 2026 Which 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. 2026 An 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.) 2026 What 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, 2026 How 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) 2026 The 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: 2026 Number of moles and number of molecules in 1.4187 L of SO₂ at STP respectively are: 2026 The 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