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प्रश्न
Fill in the blank :
Oxygen occupies about _____% of air by volume.
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उत्तर
Oxygen occupies about 21% of air by volume.
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संबंधित प्रश्न
The most abundant element in the earth’s crust.
Why is potassium chlorate not used for laboratory preparation of oxygen ?
Statement given below is incorrect. Write the correct statement :
The percentage of oxygen in air by volume, varies from 21% to 22%.
State the precautions while preparing oxygen in the labo-ratory.
Statement given below is incorrect. Write the correct statement :
Calcium burns in oxygen with a golden-yellow flame.
Tick (√ ) the most appropriate answer.
When sulphur burns in oxygen, the colour of the flame is :
(a) Starting from hydrogen peroxide how is oxygen gas prepared in laboratory?
(b) What is the function of manganese dioxide?
(c) Write fully balanced equation for the liberation of oxygen from hydrogen peroxide.
(d) Why is the above method preferred to any other method?
State any four physical properties of oxygen gas.
Write fully balanced equation for the following :
Na2O + H2O →
Give reasons for the following:
patients suffering from lung problems are kept in an oxygen tent.
