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Q.

The name of $C r_{2} O_{7}^{- 2}$ is

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a

Ammonium ion

b

Sulphate ion

c

Ferrous ion

d

Dichromate ion

answer is B.

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Detailed Solution

The name of $C r_{2} O_{7}^{- 2}$ is dichromate ion. It contains twp chromium atoms and has a charge of -2.

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