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(a) Why are alkali metals kept in kerosene oil?

(b) What is:

(i) basic lead carbonate and

(ii) brown powder deposit on iron?

(c) Why is hydrogen kept in the metal activity series?

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(a) Alkali metals like sodium and potassium are kept in kerosene as they react with moisture and air.

(b)

(i) Basic lead carbonate is a mixture of lead hydroxide and lead carbonate.

(ii) Brown powder is mainly hydrated iron

(c) oxide (Fe2O3.xH2O)

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