Multiple choice

Which one of the following substances undergoes chemical change on heating?

  1. sodium chloride

  2. silica

  3. lead nitrate

  4. platinum wire
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C Correct answer
Explanation

Lead nitrate decomposes on heating to form lead oxide (yellow), nitrogen dioxide (brown gas), and oxygen - a clear chemical change. Sodium chloride, silica, and platinum wire are thermally stable and do not undergo chemical reactions when heated in air. The decomposition of lead nitrate is a classic example of thermal decomposition.

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