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MHT CET202521 Apr 2025Evening ShiftChemistrySome Basic Concepts of ChemistryActual

The mass of 4.48 dm ^3 of certain gas is 5.6 g at STP. Assuming ideal behaviour, identify the probable gas from following.

Options

  1. ACl ₂
  2. BO ₂
  3. CN ₂
  4. DCH ₄

Correct answer

C. N ₂

Step-by-step solution

The molar mass is determined from the gas sample's mass and volume at STP, where 1 mole occupies 22.4 dm ^3 . The number of moles is n = 4.48 dm ^3 22.4 dm ^3 mol ⁻¹ = 0.2 mol . Molar mass is calculated as M = 5.6 g 0.2 mol = 28 g mol ⁻¹ . Comparing with the options: C N ₂ ( 2 14 = 28 g mol ⁻¹ ) matches the calculated molar mass.

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