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ICSE Class 10 Chemistry Question 6 of 23

Solved Sample Paper 5 — Question 14

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14
Question

Question 1(xiv)

A dry test tube containing lead nitrate is heated. Which of the following would be observed?

P. Brown fumes are given out.

Q. White coloured residue with yellow fumes are seen.

R. Yellow coloured residue is seen.

  1. Only P
  2. Only Q
  3. Only R and Q
  4. Both P and R
Answer

Both P and R

Reason — On heating, lead nitrate decomposes to form yellow coloured lead oxide, brown coloured fumes of nitrogen dioxide and oxygen as per the below reaction:

2Pb(NO3)2 (s) →Δ\xrightarrow{\Delta} 2PbO (s) + 4NO2 ↑ + O2 ↑