Please select a subject first
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What do you observe when Calcium is heated and then tested with moist blue and red litmus – paper?
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Complete and balance the following chemical equation.
\[\ce{HgO ->[heat]}\] ______ + _______
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Complete and balance the following chemical equation.
CaO + H2O → ____________
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Fill in the blank :
________ is the most abundant inert gas present in air.
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Fill in the blanks :
_______ and ______ are the most common air pollutants.
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A fuel when used releases least amount of pollutants in the air.
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Name the main components of air.
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State three uses of water vapour in the air.
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Describe a simple experiment to show that l/5th of air is oxygen.
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Fill in the blank space by choosing the correct word from the given list.
List: oxygen, carbonic, suIphurUioxide gas, precipitation, helium
Dust particles help in the ________ of water vapour in air.
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Fill in the blank space by choosing the correct word from the given list.
List: oxygen, carbonic, suIphurUioxide gas, precipitation, helium
_______ gas is used for filling weather observation balloons.
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Fill in the blank space by choosing the correct word from the given list.
List: oxygen, carbonic, suIphurUioxide gas, precipitation, helium
Solution of carbon dioxide in water is called _________ acid.
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Statement given below is incorrect. Write the correct statement :
Carbon dioxide gas allows the earth to radiate out heat rapidly.
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Statement given below is incorrect. Write the correct statement :
Helium gas at low pressure is used for filling electric bulbs.
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Statement given below is incorrect. Write the correct statement :
Symbiotic bacteria are present in nodules of cereal plants such as wheat.
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Statement given below is incorrect. Write the correct statement :
During thunder and lightning, nitrogen and oxygen combine to form nitrogen dioxide gas.
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Write ‘True’ or ‘False’ in front of following statement.
Water containing dissolved carbon dioxide can dissolve marble.
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Write ‘True’ or ‘False’ in front of following statement.
The area where a lot of fuel burns has more percentage of carbon dioxide.
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Write ‘True’ or ‘False’ in front of following statement.
The trapping of solar heat energy in the earth’s atmosphere is called greenhouse effect.
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Tick (√) the most appropriate answer.
A gas which dilutes the activity of oxygen in air is:
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