Chemistry
(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?
Oxygen
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Answer
(a)
i. When mercuric oxide is heated, it decomposes to give mercury and oxygen.
2HgO 2Hg + O2
ii. When potassium nitrate is heated, it decomposes to give potassium nitrite and oxygen.
2KNO3 2KNO2 + O2
(b) Potassium chlorate is heated to a high temperature to obtain oxygen gas which may cause
- cracking of glass apparatus being used.
- accidents and burn injuries. Thus potassium chlorate is not used for laboratory preparation of oxygen gas.
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