Question

Three substances P, Q and R are burnt. P burns quickly producing heat and light. Q burns at room temperature on its own. R burns and liberates alot of gases. What type of combustion does P, Q and R undergo?

• A. P: Rapid combustion
  Q : Rapid combustion
  R : Explosion combustion
• B. P: Spontaneous combustion
  R : Spontaneous combustion
  Q : Rapid combustion
• C. P : Rapid combustion
  Q : Spontaneous combustion
  R : Explosion combustion
• D. P: Spontaneous combustion
  Q : Rapid combustion
  R : Explosion combustion

Answer 1

The correct option is C P : Rapid combustion

Q : Spontaneous combustion
R : Explosion combustion
$\bullet$ When a substance undergoes combustion quickly, it is said to have undergone rapid combustion. So, P has undergone rapid combustion.
$\bullet$ When a substance undergoes combustion without the help of any external agent, it is called spontaneous combustion. Hence, Q has undergone spontaneous combustion.
$\bullet$ When a substance burns with the evolution of a lot of heat, light, sound and gases it is called an explosion. Therefore, R has undergone explosion.