Question

Assertion (A): Phosphorus burns in air at room temperature.
Reason (R): It is an example of spontaneous combustion.

Answer 1

Answer:

A and R are true

Explanation:

Phosphorus burns in air at room temperature. It represents spontaneous combustion. Burning of matchstick and burning of cooking gas represents rapid combustion. Ignition of cracker represents explosion.

Answer 2

Answer:

The assertion and the reason for this question are true.

Explanation:

The given assertion in the question is phosphorus burns in air at room temperature. Phosphorous pentoxide is formed when phosphorus is burned in the presence of oxygen without any need for an extra cause,

                          $P_4+5O_2$  → $2P_2O_5$

Spontaneous combustion is exemplified by the aforementioned reaction.

This sort of combustion occurs when a material spontaneously bursts into flames without any apparent cause.

When a substance catches fire as soon as its temperature reaches its ignition temperature, this is known as spontaneous combustion.

Therefore the assertion and reason for this question are true.

(The given question is incomplete, but probably the question was

Assertion (A): Phosphorus burns in air at room temperature.

Reason (R): It is an example of spontaneous combustion. Are the Assertion and Reason of this question true or false?)