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NEET levelSingle correct optionDifficulty 1 of 3sb113

When lithium is burnt in air, the main oxygen-containing product is:

A $Li X_{2} O X_{2}$
B $LiO X_{2}$
C $LiO X_{3}$
D $Li X_{2} O$

Answer: D

Lithium is small and strongly polarising, so it forms the normal oxide:

4 Li + O X_{2} 2 Li X_{2} O

(with some

Li X_{3} N

also). Larger peroxide or superoxide anions are not stabilised by the small

Li X^{+}

. The main product is

Li X_{2} O

.

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