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Give reasons for the following: a. Alk...

Give reasons for the following:
a. Alkali metals do not occur free in nature.
b. Alkali metal salts impart characteristic colour to the flame.
c. Caesium is used in photoelectric cell.
d. Alkali metals are good reducing agents in aqueous medium.

A

Oxidising flame

B

Reducing flame

C

Both a & b

D

None of these

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