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Question

Oxidation number of V in Rb4Na[HV10O28] is:

A
+3
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B
+5
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C
+4
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D
Zero
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Solution

The correct option is B +5
Oxidation number of Rb = +1
Oxidation number of Na = +1
Oxidation number of H = +1
Let oxidation number of V = x
Oxidation number of O = -2
4×1+1+1+10x+28×(2)=0
6+10x56=0
10x=50
x=5010=+5

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