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KCET2011ChemistrySome Basic Concepts of Chemistry

A mixture of CaCl ₂ and NaCl weighing 4.44 ~g is treated with sodium carbonate solution to precipitate all the calcium ions as calcium carbonate. The calcium carbonate so obtained is heated strongly to get 0.56 ~g of CaO . The percentage of NaCl in the mixture is (atomic mass of Ca =40 )

Options

  1. A75
  2. B31.5
  3. C40.2
  4. D25

Correct answer

A. 75

Step-by-step solution

Amount of NaCl =4.44-1.12=3.32 % of NaCl = 3.32 4.44 100=75

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