_________ fuels occur in the same form as they occur in nature.
Primary
Secondary
Gaseous
Non-renewable
Which word equation correctly shows how methane undergoes combustion in a plentiful supply of air?
Methane → Carbon dioxide + Steam
Methane + Oxygen → Carbon dioxide + Hydrogen
Methane + Air → Carbon + Hydrogen
Methane + Oxygen → Carbon dioxide + Steam
Water cannot be used as fire extinguisher to put out:
burning wood
burning oil
burning cloth
burning charcoal
A ____________ is one which is readily available, cheap and burns easily in air at a moderate rate
Good fuel
Ideal fuel
Liquid fuel
Solid fuel
The flame of a Bunsen burner is _________, when the air hole is open and ___________ when the air hole is closed.
Blue, green
Yellow, blue
Yellow, green
Blue, yellow
When combustion occurs, unburnt carbon particles are produced. These particles are harmful, as they cause
Respiratory problems
Digestion problems
Heat problems
Skin problems
On the complete combustion of methane we get a material that is
Acidic
Basic
Neutral
Solid
Which of the following has the characteristics of a good fuel?
Coke
Butane
Coal
Kerosene
Oxides of sulfur and nitrogen dissolve in rain water and form acids such rain is called__________
Acid rain
Chemical rain
Global warming
Fuels
In foam type extinguisher______ is present in bottle.
NaHCO3
Al2(SO4)3
Al(OH)3
Na25O4