Identify P and Q:
P: I am the most common fire extinguisher but not suitable for oil, petrol, and electrical fires. I am heavier than oil and also, conduct electricity.
Q: I am an excellent fire extinguisher and most suitable for oil, petrol, and electrical fires. I also, form a blanket around the fire and bring down the temperature of the fuel.

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P - H₂ Q- CO₂

P - CO₂ Q- H₂O

P- CO₂ Q- O₂

P - H₂O Q- CO₂

answer is B.

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Detailed Solution

P is water ( H₂O) and Q is carbon dioxide (CO₂)

Water is heavier than oil and petrol and sinks below them, and oil and petrol keep burning on top. Water is a good conductor of electricity. So P is water. For fires involving electrical equipment and inflammable materials like petrol, carbon dioxide (CO₂) is the best extinguisher. So Q is carbon dioxide.

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