Some Basic Concepts of Chemistry
1 solved NEET Chemistry previous year questions on Some Basic Concepts of Chemistry, each with the correct answer and a full explanation.
Q1
A metal chloride contains 55.0% of chlorine by weight. 100 mL vapours of the metal chloride at STP weigh 0.57 g. The molecular formula of the metal chloride is (Given: Atomic mass of chlorine is 35.5 u)
✓ Correct answer: a) MCl2
ExplanationGiven: Mass = 0.57 g, Volume = 100 mL = 0.1 L At STP, molar volume = 22.4 L Moles = 0.1 / 22.4 = 0.004464 mol Molar mass = 0.57 / 0.004464 ≈ 127.7 g/mol Let metal chloride be MClₓ %Cl = (35.5x / (M + 35.5x)) × 100 = 55 Putting M + 35.5x = 127.7, solve: 35.5x = 70.24 ⇒ x = 2 So formula = MCl₂ Answer: Option A
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