Question

Calculate the oxidation number of underlined elements in the following compounds:
$\underset{--}{Cr}{O}_{2}C{l}_2$

• A. 4
• B. -4
• C. 6
• D. 2

Answer 1

The correct option is C 6

Let oxidation number of Cr be 'x' in $Cr{O}_{2}C{l}_2$
$\text{charge on}Cl=-1$
$\text{charge on}O=-2$
$x-2\times 2+2\times (-1)=0$
$x=+6$