State two disadvantages of incomplete combustion.
(i) Incomplete combustion of a fuel produces a poisonous gas called carbon monoxide and unburnt carbon particles which cause pollution.
(ii) Incomplete combustion of a fuel produces less heat and hence leads to the wastage of fuel.
How does water help in extinguishing the fire ?
How is acid rain formed ?
The wick in a spirit lamp does not burn while the spirit in it burns. Give two reasons for the wick not burning.
What should be done to control fire due to oils ?
