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Choose the incorrect statement from the following

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$K_{2} C r_{2} O_{7}$ is a very important chemical used in leather industry

$K_{2} C r_{2} O_{7}$ is used as a primary standard in volumetric analysis

$K M n O_{4}$ is not very soluble in water

(6.4g/100g of water at 293K)

Manganate ion is tetrahedral where as chromate ion is octahedral

answer is D.

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Manganate and chromate ions are tetrahedral.

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