Question

a) (i) Distinguish gangue and ore.


(ii) Why is the metal sodium stored by immersing it in kerosene?

(OR)

b) What happens when magnesium react with steam?
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Answer 1

Answer:

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Explanation:

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Answer 2

Explanation:

i)answer in pic....

ii)Sodium and Potassium are highly reactive metals and react vigorously with the oxygen, carbon dioxide and moisture present in the air such that it may even cause a fire. To prevent this explosive reaction, Sodium is kept immersed in kerosene because Sodium doesn't react with kerosene......

or

b)Magnesium burns in steam to produce white magnesium oxide and hydrogen gas. ... However, the reaction soon stops because the magnesium hydroxide formed is almost insoluble in water and forms a barrier on the magnesium preventing further reaction.

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