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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)

1. MCl 4
2. MCl 3
3. MCl 2
4. MCl

Correct answer: MCl 2

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