Question

The ignition temperatures of four substances, P, Q, R, and S, are 125 °C, 270 °C, 155 °C, and 310 °C respectively. Which of the following pairs of substances catches fire at 250 °C?​

Answer 1

Answer:

For substance burn the temperature should be greater than or equal to ignition temperature. As p and r have ignition temperature 125°C and 155°C which is less than 250°C. Therefore p and r will catch fire. Aakash EduTech Pvt.