Question

What is the oxidation number of vanadium in $R b_{4} N a\left[H V_{10} O_{28}\right] ?$

• A. 8
• B. 5
• C. 3
• D. 1

Answer 1

Answer: (B)

5

Answer 2

$R b_{4} N a\left[H V_{10} O_{28}\right]$
Let oxidation number of $V$ is $x$.
$\therefore 4 \times 1+1+[+1+10 x+28(-2)]=0$
or $4+1+1+10 x-56=0$
or $x=+5$