Multiple choice

Water is not effective in extinguishing a fire caused by petrol because

  1. the flame is too hot for water to cool it down

  2. water and petrol react chemically

  3. water and petrol are miscible with each other

  4. water and petrol are immiscible with each other and petrol forms the upper layer and continues to burn
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Water is denser than petrol and insoluble in it, meaning petrol floats on top of water and continues to burn. Therefore, using water only spreads the burning fuel rather than smothering it.

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