Q42 / 180 · KCET 2012 · Chemistry

The equivalent mass of a certain bivalent metal is 20 . The molecular mass of its anhydrous chloride is

  • Correct answer
    A
    111
  • B
    $55.5$
  • C
    $75.5$
  • D
    91

Solution

Atomic weight of metal = equivalent weight $x$ valency $$ =20 \times 2=40 $$ Molecular formula of metal chloride $=\mathrm{MCl}_{2}$ $\therefore$ Molecular mass of $$ \mathrm{MCl}_{2}=40+2 \times 35.5=111 \mathrm{~g} \mathrm{~mol}^{-1} $$

Hence, the correct answer is option: 'A'.

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