Chemistry
(a) Taking hydrogen peroxide, how would you prepare oxygen in the laboratory?
(b) What is the role of manganese dioxide in the preparation of oxygen?
(c) Write the balanced chemical equation for the above chemical reaction.
(d) Why is hydrogen peroxide preferred in the preparation of oxygen gas?
(e) Why is oxygen collected by downward displacement of water?
(f) What happens when a glowing splinter is introduced in a jar containing oxygen?
(g) What happens when oxygen gas is passed through alkaline pyrogallol solution?
Related Questions
(a) What are the causes of air pollution?
(b) Suggest five measures to prevent air pollution.
Name:
(a) The most abundant element in the earth's crust.
(b) A chemical called oxygenated water.
(c) A metal highly resistant to rusting.
(d) A mixture of oxygen and carbon dioxide used for artificial respiration.
(e) Two substances from which oxygen can be obtained on a large scale.
(f) An oxide and a carbonate containing oxygen.
(g) Two substances which undergo rapid oxidation.
(a) What happens when (i) mercuric oxide and (ii) potassium nitrate are heated?
(b) Why is potassium chlorate not used for laboratory preparation of oxygen?
What are oxides? Give two examples for each of metallic and non-metallic oxides.