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Most Important Selected Qs for JEE AdvancedChemistrySome Basic Concepts of Chemistry

25 g of a mixture containing NaCl , Na ₂ CO ₃ and CaCO ₃ is heated with dil HCl produces 8.8 ~g CO ₂ gas. 50 g of the same mixture on dry heating gives 8.8 ~g CO ₂ gas. Percentage composition of NaCl , Na ₂ CO ₃ and CaCO ₃ respectively is

Options

  1. A42.4 %, 17.6 % and 40 %
  2. B17.6 %, 42.4 % and 40 %
  3. C27.2 %, 52.8 % and 20 %
  4. D21.4 %, 38.6 % and 40 %

Correct answer

B. 17.6 %, 42.4 % and 40 %

Step-by-step solution

aligned & Mass of NaCl ⁻ ag & Mass of Na ₂ CO ₃= b g & Mass of CaCO ₃= c g & a + b + c =25 ~g & ~b 106 + c 100 = 8.8 44 =0.2 & 2 c 100 =0.2 & c 100 =0.1 & c =10 gm & b =10.6 gm & a =4.4 gm aligned

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