A) Q and S
B) P and R
C) R and S
D) P and Q
Correct Answer: B
Solution :
The lowest temperature at which a substance catches fire is called its ignition temperature. A substance burns only when the temperature of the substance is higher than its ignition temperature. The ignition temperatures of P and R are lower than\[250{}^\circ \]. Therefore, P and R will catch fire at\[250{}^\circ C\].The correct answer is B.You need to login to perform this action.
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