Question

The ignition temperature of fuel A, B, C and D are given below.$$\begin{array}{cc}\text{Fuel}& \text{Ignition Temperature}\\ \text{A}& 5^{\circ }\text{C}\\ \text{B}& {17}^{\circ }\text{C}\\ \text{C}& {480}^{\circ }\text{C}\\ \text{D}& {60}^{\circ }\text{C}\end{array}$$Which fuels will undergo spontaneous combustion at room temperature (${25}^{\circ }\text{C}$)?

• A. Fuel A and D
• B. Fuel A and B
• C. Fuel B and C
• D. Fuel C and D

Answer 1

The correct option is B Fuel A and B

Spontaneous combustion is the combustion in which no external source of heat is required for the ignition of the substance.

Substances that have ignition temperatures lower than room temperature (${25}^{\circ }\text{C}$) will undergo spontaneous combustion.

The ignition temperature of fuel A and B are lower than the room temperature $\text{(}{25}^{\circ }\text{C)}$. Thus, they will start burning spontaneously at room temperature.

The ignition temperature of fuel C and D are higher than the room temperature. So they will not undergo spontaneous combustion at room temperature.