Question : Which one out of the following helps in burning?
Option 1: Oxygen
Option 2: Carbon monoxide
Option 3: Nitrogen
Option 4: Carbon dioxide
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Correct Answer: Oxygen
Solution : The correct answer is Oxygen.
Oxygen gas helps in burning. In a combustion reaction, a substance reacts with oxygen gas and releases energy in the form of heat and light. It is an exothermic reaction. If the supply of oxygen stops, the combustion reaction also stops i.e. burning stops.
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Question : Which of the following gases shields the surface of the Earth from ultraviolet (UV) radiation from the Sun?
Option 1: Carbon monoxide
Option 2: Ozone
Option 3: Oxygen
Question : The highest volume of gases in the lower atmosphere is comprised of
Option 1: Hydrogen
Option 2: Carbon dioxide
Option 4: Nitrogen
Question : When the bread rises and bakes, __________creates thousands of bubbles in the dough.
Option 1: phosphorus
Option 2: nitrogen
Option 3: oxygen
Option 4: carbon dioxide
Question : Which of the following is not a greenhouse gas?
Option 1: Nitrogen
Option 2: Methane
Option 3: Carbon dioxide
Option 4: Nitrous oxide
Question : Which of the following processes does not increase the amount of carbon dioxide in the air?
Option 1: Breathing
Option 2: Photosynthesis
Option 3: Burning of petrol
Option 4: Aerobic decay of vegetation
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