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KVPY2012ChemistrySome Basic Concepts of Chemistry

The weight of calcium oxide formed by burning 20 ~g of calcium in excess oxygen is -

Options

  1. A36 ~g
  2. B56 ~g
  3. C28 ~g
  4. D72 ~g

Correct answer

C. 28 ~g

Step-by-step solution

array l Ca + 1 2 O ₂ CaO Ca = 20 40 = 1 2 moles CaO formed = 1 2 moles w = 1 2 56=28 gm array

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