Combustion and ...

Which of the following is a necessary condition for spontaneous combustion to take place?

The disadvantages of incomplete combustion is/are:

When wood is used as fuel in chulhahs, gaps are left in between the logs of wood. This is done for _________.

When water is poured over burning wood, the fire goes off. This is because _________.

Inflammable substances have a __________ ignition temperature.

Fire involving electrical equipment can be extinguished by using __________.

Which of the following is an excellent fuel?

In which zone of a candle flame does complete combustion take place?

The head of a safety match contains:

The process of burning a substance in the presence of air with the evolution of heat is called as __________.