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NEETChemistrySome Basic Concepts of Chemistry

Match List-I with List-II: List-I (Mass of substance) List-II (Total number of atoms) A. 16 g of CH ₄ I. 0.4 N _ A B. 1.7 g of NH ₃ II. 1 N _ A C. 14 g of N ₂ III. 0.5 N _ A D. 2 g of He IV. 5 N _ A Choose the correct answer from the options given below:

Options

  1. AA-II, B-III, C-IV, D-I
  2. BA-IV, B-I, C-II, D-III
  3. CA-IV, B-I, C-III, D-II
  4. DA-II, B-I, C-III, D-IV

Correct answer

B. A-IV, B-I, C-II, D-III

Step-by-step solution

Number of moles = Given mass Molar mass Total number of atoms = Number of moles N _ A Atomicity A. For 16 g of CH ₄ : Moles = 16 16 = 1 mol Atomicity of CH ₄ = 5 Total atoms = 1 N _ A 5 = 5 N _ A (Matches with IV) B. For 1.7 g of NH ₃ : Moles = 1.7 17 = 0.1 mol Atomicity of NH ₃ = 4 Total atoms = 0.1 N _ A 4 = 0.4 N _ A (Matches with I) C. For 14 g of N ₂ : Moles = 14 28 = 0.5 mol Atomicity of N ₂ = 2 Total atoms = 0.5 N _ A 2 = 1 N _ A (Matches with II) D. For 2 g of He : Moles = 2 4 = 0.5 mol Atomicity of He = 1

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