Burning of Matchstick

Q. Which of the following are the components of a matchstick head?

1. Antimony trisulfide
2. Potassium chlorate
3. Sodium chloride
4. Carbon dioxide

Q. When a matchstick is rubbed against the side of match box, the red phosphorus in it:

1. ignites antimony disulphide.
2. converts into potassium chlorate.
3. converts into white phosphorus.
4. ignites potassium chlorate.

Q. Assertion [A]: White phosphorus undergoes spontaneous combustion while paper undergoes complete combustion.
Reason [R]: Burning of paper leaves a lot of soot and ash behind.

Which of the following options is correct ?

1. Both A and R are true, and R is the correct explanation of A.
2. A is true but R is false.
3. A is false but R is true.
4. Both A and R are true, but R is not the correct explanation of A.

Q.

Write the uses of silicon and antimony.

Q.

Antimony is used in storage batteries.

1. True
2. False

Q. Akram is unable to light a matchstick as the rough surface of the matchbox is wet. Which amongst the following is the reason behind this?

1. Red phosphorus does not get converted to white phosphorus
2. Red phosphorus gets converted to white phosphorus
3. White phosphorus does not get converted to red phosphorus
4. White phosphorus gets converted to red phosphorus

Q. The striking surface of a matchbox is mainly made up of ________.

1. potassium
2. sodium
3. phosphorus
4. argon

Q.

why is hydrogen a explosive gas?

Q. The combustion reaction which occurs on its own, without any external supply of heat is called as:

1. Rapid combustion
2. Spontaneous combustion
3. Explosion
4. Fire