When a hydrocarbon fuel is burnt in a sufficient supply of air__________ and _________are produced.
CO, CO2
CO2, H2O vapours
CO, H2O vapours
H2O liquid, H2O vapours
_________ metal is usually stored in kerosene
Sodium
Copper
Aluminium
Iron
The conditions necessary for combustion are:
presence of combustible substance
presence of supporter of combustion
attainment of ignition temperature
all of these
When combustion occurs, unburnt carbon particles are produced. These particles are harmful, as they cause
Respiratory problems
Digestion problems
Heat problems
Skin problems
Read the given statements and select the correct option.
Statement 1: Combustion is a chemcial process in which a substance reacts with oxygen to give off heat and at times light.
Statement 2: Heat and light produced in sun are due to combustion.
Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
Statement 1 is true and statement 2 is false.
Both statements 1 and 2 are false
Which of the following statements is correct?
Any substance that can burn is an inflammable substance
Spontaneous cumbustion starts at room temperature
During an explosion, a large amount of acid is produced.
Water is useful in putting out all fires.
Which among the following is the best fuel?
Wood 4000 Cal/g
Coke 8000 Ca/g
Coal 7000 Cal/g
Kerosene 11,200 Cal/g
Water cannot be used as fire extinguisher to put out:
burning wood
burning oil
burning cloth
burning charcoal
LPG is mainly a mixture of two hydrocarbons:
butane + ethane
butane + isobutane
propane + ethane
methane + ethane
Burning of a matchstick is an example of a __________.
Slow Combustion
Rapid Combustion
Spontaneous Combustion
None of these