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Combustion and Flame Test - 17

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Combustion and Flame Test - 17
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  • Question 1
    1 / -0
    When sand is poured over some burning material, the fire goes off. It is because:
    Solution
    The process of burning takes place only in the presence of air. When sand is poured over some burning material,  it covers the material and cuts the supply of air. As soon as air is unavailable, the material stops burning and, the fire goes off.  So option B is correct.
  • Question 2
    1 / -0
    Which of the following chemical starts the combustion process in the matchstick?
    Solution
    Phosphorous which is applied on the head of a matchstick has a very low ignition temperature of $$35^{\circ}$$ C. During rubbing, the heat produced due to friction is sufficient to attain this temperature and combustion takes place.
    Option $$C$$ is correct.
  • Question 3
    1 / -0
    Which of the following property is not a characteristic of a good fuel?
    Solution
    The fuel that has low cost causes minimum pollution, and is readily available, is a good fuel. 
    But, when we consider the ignition temperature of the fuel, it should not be too high nor too low. The fuel with a low ignition temperature easily catches fire and is unsafe. On the other hand, the one with a high ignition temperature does not readily catch fire and is difficult to use. So option A is the correct one.

  • Question 4
    1 / -0
    The rubbing surface of a matchbox has which of the following element
    Solution
    The rubbing surface has powdered glass and a little red phosphorus. When the match is struck against the rubbing surface, some red phosphorus gets converted into white phosphorus. This immediately reacts with potassium chlorate in the matchstick head to produce enough heat to ignite antimony trisulphide and start the combustion.
  • Question 5
    1 / -0
    Fuels can exist in which of the following states?
    Solution
    Substances or materials which undergo combustion to release a large amount of usable energy are called fuels. The most common examples are:
    • Natural gas, propane - Gas
    • Kerosene, diesel, petrol - Liquid
    • Charcoal, wood - Solid
    Thus, fuels can exist in all three states.
  • Question 6
    1 / -0
    The fuels which leave more smoke and ash on burning is/are_____.
    Solution
    Solid fuels leave more smoke and ash on burning because they contain a large number of impurities.
  • Question 7
    1 / -0
    Which of the following is an ideal fuel?
    Solution
    An ideal fuel must possess high calorific value, must have a moderate rate of combustion and must be easily available, there is no emission of harmful substances which means it is an eco-friendly fuel
    Coal and petrol on burning emit a high amount of harmful substances in the environment and hence cannot be considered ideal fuels.
    LPG is close to being an ideal fuel but still cannot be considered as an ideal fuel as it doesn't have all the characteristics of an ideal fuel.

    Hence, the correct option is $$\text{D}$$
  • Question 8
    1 / -0
    A burning substance will ___________, if the temperature falls below its ignition temperature.
    Solution
    The ignition temperature of a substance is the lowest temperature at which a substance catches fire and burns in the air.
    Below this temperature, a substance will stop burning and get extinguished.
  • Question 9
    1 / -0
    Which of the following is a non-combustible substance?
    Solution
    Combustible substances can easily catch up the fire and burn rapidly while non-combustible substances cannot be easily ignited.
    We know that coke, coal, and wood are fossil fuels and are used for cooking purposes, therefore, these are combustible substances. So the substance which is non-combustible is diamond. 
  • Question 10
    1 / -0
    The lowest temperature at which a substance starts burning is called _________.
    Solution
    The ignition temperature of a substance is the lowest temperature at which the substance starts burning.
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