CBSE Questions for Class 8 Chemistry Combustion And Flame Quiz 9 - MCQExams.com

$${ NH }_{ 3 }$$ burns in air under suitable condition to produce
  • $${ N }_{ 2 }$$
  • $$NO$$
  • $${ N }_{ 2 }O$$
  • $${ N }_{ 2 }{ O }_{ 5 }$$
Which substance is not used as a fuel?
  • Ethanol
  • Hydrogen
  • Methane
  • Oxygen
Which of the following is not given out during complete combustion of fuel?
  • Heat
  • water
  • Carbon monoxide
  • Carbon dioxide

The hottest region in Bunsen flame shown in the figure given is:
1381541_88e3524a4ef443218c73d574703c597a.PNG
  • Region 2
  • Region 3
  • Region 4
  • Region 1
For complete combustion of a fuel, it will need:
  • high temperature
  • an excess of air
  • high air pressure
  • an excess of air and high temperature
Which compound is formed due to incomplete combination of fuels?
  • Carbon dioxide
  • Oxygen
  • Carbon monoxide
  • Water
In laboratory for burning, we use: 
  • gobar gas
  • coal gas
  • oil gas
  • None of these
Which of the following are the characteristics of Indian coal?
$$1$$. High ash content
$$2$$. Low sulphur content
$$3$$. High sulphur content
Select the correct answer using the codes given.
  • $$1$$ and $$2$$ only
  • $$2$$ only
  • $$1$$ and $$3$$ only
  • $$1, 2$$ and $$3$$
$$CO_{2}$$ is a tasteless, colorless and
  • Non-combustible gas
  • Combustible gas
  • Flammable Gas
  • All of above
Indicate whether the following statement is True or False. Also, write the false statements in their correct form.

The calorific value of wood is higher than that of coal.
  • True
  • False
Air is necessary for combustion.
  • True
  • False
An increased concentration of nitrogen in the air is believed to cause global warming.
  • True
  • False
Water is the best extinguisher for fire.
  • True
  • False
Nitrogen dioxide reacts with water to give :
  • sulphuric acid
  • nitric acid
  • nitrogen
  • carbon dioxide
Why are the spirit and kerosene lamps made in such a way that the free end of the wicks with the flame remains totally cut off from the fuel?
84839.png
  • Only (i) and (ii)
  • Only (ii) and (iii)
  • Only (i) and (iii)
  • (i), (ii) and (iii)
Combustion is a ________ reaction accompanied by heat and light.
  • reduction
  • redox
  • substitution
  • oxidation
All fuels undergo combustion. Identify the fuel which undergoes slow combustion on burning.
  • Wood
  • Kerosene
  • Petrol
  • Diesel
Look at the given figures.
From the given figures, it is observed that the flame goes off on placing a lid over the flame. What inference can be made from the observation?
84864.png
  • Nitrogen supports combustion
  • Oxygen is necessary for combustion
  • Carbon dioxide helps in combustion
  • All of the above
In foam type fire extinguisher, _______ is responsible to put off fire.
  • $$H_2O$$
  • $$CO_2 + H_2O$$
  • $$CO_2$$
  • $$CO$$
Which type of fire extinguisher is used to extinguish fire caused by burning oil and petrol?
  • Foam type
  • Water type
  • Soda acid type
  • $$CCl_4$$ type
The lowest temperature at which a substance starts burning is called its:
  • minimum temperature
  • maximum temperature
  • boiling temperature
  • ignition temperature
Match column 'A' with column 'B', concerning the characteristics of a flame and its zones.
'A''B'
a. Dark inner zoneHottest part (No carbon)
b. Blue zonePartial combustion
c. Luminous zoneUnburnt vapours of wax
d. Non-luminous zoneComplete combustion
  • a -1, b - 2, c - 3, d - 4
  • a - 2, b - 3, c - 4, d - 1
  • a - 3, b - 4, c - 2, d - 1
  • a - 4, b - 1, c - 2, d - 3
Which of the following happen when a wax candle is burnt?
85748.png
  • (i) and (ii)
  • (ii) and (iii) 
  • (iii) and (i) 
  • (i), (ii) and (iii)
Which one of the following is used as clean fuel?
  • Petrol
  • Mineral oil
  • Methane
  • LPG
___________ component of air is the supporter of burning.
  • oxygen
  • nitrogen
  • hydrogen
  • none of these
In a Bunsen's burner, use is made of:
  • Surface tension
  • Suction Pump
  • Boyle's Law
  • Bernoulli's theorem
  • Archmedes' principle
A paper-wrapped tightly around the joint of a brass tube and its wooden handle is put in a flame, the paper will:
  • catch fire immediately
  • not burn at any place
  • burn around the brass tube
  • burn around the wooden handle
The gas used in fire extinguishers is
  • Nitrogen
  • Sulphur dioxide
  • Carbon dioxide
  • Hydrogen
What does the above experiment show ?
315416_ae9d6d63187f4c5ea480bfa7146333ae.png
  • The direction of movement of hot and cold air.
  • Oxygen is present in the air and is necessary for burning.
  • The temperature of air inside the bottle is more than the temperature of open air.
  • The direction in which the maximum smoke is produced & pollutes the environment.
The substances which vaporize during burning, give flame.
  • True
  • False
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