The ignition temperature of four substances A,B,C and D are 35°C,40°C,60°C and 65°C.Which of these would undergo combustion at 50°C?
A and C
C and D
A and B
B and D
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Explanation: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 than250∘. Therefore, P and R will catch fire at250∘C
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