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प्रश्न
Tick (√ ) the most appropriate answer.
Magnesium burns with a dazzling white flame to form magnesium oxide, a powdery mass. The colour of magnesium oxide is :
पर्याय
milk white
grey
silvery
yellow
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उत्तर
milk white
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संबंधित प्रश्न
Fill in the blanks :
_______ and ______ are the most common air pollutants.
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.
Statement given below is incorrect. Write the correct statement :
Symbiotic bacteria are present in nodules of cereal plants such as wheat.
Tick (√) the most appropriate answer.
Which is not a polluting gas for the air?
What are the main components of air?
Of the total volume of air – 4/5th is nitrogen. State the utility or consequence of this ratio.
Air is made up of oxygen only.
How do plants and animals maintain the balance of oxygen and carbon dioxide in the air?
“Air is not an elementary substance, but a composition”. Why?
The components of air which are harmful to living beings are ______.
