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ICSE Class 10 Chemistry Question 2 of 23

Model Paper 3 — Question 3

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3
Question

Question 1(iii)

A compound with Empirical formula XY2, has vapour density equal to its empirical formula weight, its molecular formula is:

  1. XY2
  2. X3Y6
  3. X2Y4
  4. X6H12
Answer

X2Y4

Reason — Vapour density = Empirical formula weight,

∴ Molecular weight = 2 × Vapour density = 2 × (Empirical formula weight)

Therefore,

Molecular formula = 2 × (Empirical formula)

So, the correct molecular formula should be X2Y4