Q.

Peroxides of alkali metals are

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a

Paramagnetic

b

Diamagnetic

c

Acidic in nature

d

Amphoteric in nature

answer is B.

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Detailed Solution

Diamagnetic All the alkali metals are paramagnetic because of the presence of one valence electron in the valence shell. The alkali metal cations i.e. Li+, Na+, K+, Rb+ and Cs+ all are diamagnetic because of absence of unpaired electrons. Therefore, their salts do not show paramagnetic property.
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