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ICSE Class 10 Chemistry Question 1 of 23

Solved Sample Paper 3 — Question 4

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4
Question

Question 1(iv)

The reddish brown coloured gas formed when nitric acid reacts with carbon is

  1. N2O5
  2. N2O4
  3. NO2
  4. N2O3
Answer

NO2

Reason — Nitric acid oxidises carbon to carbon dioxide whereas it itself undergoes reduction to form NO2 which is reddish brown in colour.

C + 4HNO3 ⟶ CO2 + 2H2O + 4NO2