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Q.

${Cr}_{2} O_{7}^{2 -}$ is not a self indicator but

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a

Both (a) and (b) simultaneously

b

oxidises the indicator substance

c

None of the above

d

reduces the indicator substance

answer is B.

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Detailed Solution

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${Cr}_{2} O_{7}^{2 -}$ is not a self indicator, but it oxidises the indicator substance.

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