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Combustion and Flame Test - 11

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Combustion and Flame Test - 11
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which one of the following is combustible?
    Solution
    Paper is combustible because the paper is made from wood pulp which is an organic matter, it burns in presence of air.
  • Question 2
    1 / -0
    Innermost zone is the _______.
    Solution
    The innermost zone is the least hot part black in colour. This is due to the unburned wax vapor.
  • Question 3
    1 / -0
    Good fuel is:
    Solution
    A fuel is considered good or valuable if it has a low ignition temperature and it produces a large quantity of heat and has high calorific value. Ideal fuels should be easy to store, leave behind no ash after being burnt and burn easily.  They are cheap, easily available, produce no harmful odor while burning and can be transported easily and their combustion can be controlled.
  • Question 4
    1 / -0
    Substance which vaporize during burning gives ____________.
    Solution
    Substances which vaporize during burning gives flame. For example, combustion of kerosene oil produces a flame. On the other hand, certain substances like coal do not vaporize and hence does not produce a flame.
  • Question 5
    1 / -0
    Explosion is the evolution of:
    Solution
    Combustion that occurs very rapidly with the evolution of heat, light, and sound is known as explosion. 
    Example - Crackers.
  • Question 6
    1 / -0
    Charcoal burns in air to produce ______.
    Solution
    Charcoal burns in air mainly to produce $$CO_2$$. It usually burns slowly giving an orange glow from the burning layer of charcoal and leaving white ash behind.
  • Question 7
    1 / -0
    On burning fuel produces _________ amount of heat.
    Solution
    Coal, petroleum and Natural gas all these considered as fossil fuels. When combustion takes place, the hydrocarbons present in the fossil fuel create energy. The heat that is used to burn fossil fuels causes molecules of hydrogen and carbon to react and produce a large amount of heat.
  • Question 8
    1 / -0
    Combustion is a reaction in which a substance reacts with:
    Solution
    Combustion is a chemical process where substance reacts with Oxygen to give off a lot of heat. So combustion reactions involve molecular oxygen $$O_2$$. When wood burns, it must do so in the presence of $$O_2$$.
  • Question 9
    1 / -0
    Which one of the following is non-combustible?
    Solution
    Stone piece is composed by small pieces of rocks and clay. So it does not have organic matter in it to burn in presence of air. Hence, it  is a non combustible.
  • Question 10
    1 / -0
    Yellow colour in the flame denotes __________.
    Solution
    The middle zone is moderately hot and is yellow in color. This is because of partial combustion.
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