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प्रश्न
The most abundant element in the earth’s crust.
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उत्तर
Oxygen.
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संबंधित प्रश्न
Give four uses of oxygen.
Fill in the blank :
____________ discovered the oxygen gas.
The natural way of adding oxygen to air which involves green plants is called
Fill in the blank:
Oxygen is slightly _________ than air.
State the use of manganese dioxide in the laboratory prepa-ration of oxygen from potassium chlorate.
Statement given below is incorrect. Write the correct statement :
Calcium burns in oxygen with a golden-yellow flame.
Write ‘True’ or ‘False’ in front of following statement.
Under laboratory conditions, the oxygen gas is insoluble in water.
Give tests for oxygen gas.
Give reasons for the following:
oxygens finds utility in welding & cutting of metals.
Oxygen is a poor conductor of heat and electricity.
