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Explain (i) Why alkali metals are norm...

Explain
(i) Why alkali metals are normally kept in kerosene oil.
(ii) Why alkali metal impact colour to the flame?
(iii) Explain, why lithium chloride has more covalent character than potassium chloride?
(iv) Why `BeCO_(3)` is kept in an atmosphere of `CO_(2)`?

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