Multiple choice

The process that involves a chemical change is

  1. dissolution of common salt in water

  2. refining of petroleum by fractional distillation

  3. combustion of petrol in motor cars

  4. mixing of petrol and ethyl alcohol
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Combustion is a chemical reaction where a substance reacts with oxygen to produce new substances (like CO2 and water). The other options are physical processes (dissolution, distillation, mixing).

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