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ICSE Class 10 Chemistry Question 3 of 23

Solved Sample Paper 5 — Question 6

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6
Question

Question 1(vi)

Percentage of calcium in calcium carbonate (CaCO3) is

  1. 40
  2. 30
  3. 48
  4. 36
Answer

40

Reason —

Molecular weight of CaCO3
= 40 + 12 + (16 x 3)
= 40 + 12 + 48
= 100 g

100 g of CaCO3 contains 40 g of calcium

Therefore, percentage of Ca = 40100\dfrac{40}{100} x 100 = 40%