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 which forms the upper layer continues to burn
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Petrol is less dense than water and is immiscible with it. If water is poured on a petrol fire, the petrol floats on top of the water and continues to burn, potentially spreading the fire.

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