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JEE Main202312 Apr 2023Morning ShiftChemistrySome Basic Concepts of ChemistryActual

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 )

Options

  1. AMCl 4
  2. BMCl 3
  3. CMCl 2
  4. DMCl

Correct answer

C. MCl 2

Step-by-step solution

Let the formula of metal chloride be MCl x Mass of 100   mL of vapours of MCl x at STP = 0 . 57   g The mass of substance which occupies 22400 ml of volume at STP is molar mass(M) ∴   100 × M 22400 = 0 . 57 ∴ Molar mass of MCl x = 127 . 68   g   mol – 1 The mass percentage of chlorine = mass   of   chlorine mass   of   the   compound × 100 % of Cl = 35 . 5 x × 100 127 . 68 = 55 ⇒   x = 2 ∴ Formula of metal chloride i

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