Multiple choice

Which of following substances undergoes chemical change on heating?

  1. Sodium chloride

  2. Silica

  3. Lead nitrate

  4. Platinum wire
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Lead nitrate decomposes on heating (thermal decomposition) to form lead oxide, nitrogen dioxide, and oxygen. This is a chemical change as new substances are formed. Sodium chloride and silica are stable to heat, while platinum wire only undergoes physical change.

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