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Total number of Cr–O bonds in Chromate i...

Total number of Cr–O bonds in Chromate ion and dichromate ion is.

A

(a) 10

B

(b) 11

C

(c) 12

D

(d) 13

Text Solution

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The correct Answer is:
12
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Potassium dichromate is used as'lab reagent and dichromate ion can be used as a primary standard in volumetric analysis. (1)/(2)Cr_(2)O_(7)^(2-)+7H^(+)+3e^(-)iffCr^(3+)+3(1)/(2)H_(2)O,E^(@)=1.33V When H_(2)O_(2) is added to an acidified' solution of dichromate, a complicated reaction occurs. The formation of product depends on the pH value and concentration of dichromate ions. A deep-blue violet peroxo compound X is formed which decomposes rapidly in aqueous solution. This compound can be extracted in ether, where it reacts with pyridine forming the adduct PyCro(O_(2))_(2) In alkaline solution, K_(2)Cr_(2)O_(7) with 30% H_(2)O_(2) a red-brown compound Y (K_(3) CrO_(8) is formed. In ammonia solution the dark red-brown compound. Z [(NH_(3)),CrO_(4)] is formed. In alkaline solution, dichromate ion changes to chromate ion which is also used as reagent in quantitative analysis of cations QWhich of the following cations can be identified by using Na_(2) CrO_(4) solution? Ba^(2+) Pb^(2+) Ag^(+) (IV) Sr^(2+)

How many Cr-O bonds are equivalent in chromate dianion ?

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