Q.

The oxidation number of “V” in Rb4Na[HV10O28] is

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a

+6

b

+5

c

+7

d

+3

answer is B.

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Detailed Solution

  • Total charge on the Rb4Na[HV10O28] is 0.
  • Let the oxidation number of vanadium be X.

                        Oxidation state of Rb is +1.

                         Oxidation state of Na is +1

                        Oxidation state of H is +1

                        Oxidation state of O is -2

Rb4Na[HV10O28]=4(1)+1+1+10X+28(-2)=0

Therefore 10X=50X=+5

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