Question

Which of the following oxidation numbers is not correctly matched?

• A. P in $NaH_{2}PO_{4} = + 5$
• B. Ni in $\lbrack Ni(CN)_{6}\rbrack^{4 -} = + 2$
• C. P in $Mg_{2}P_{2}O_{7} = + 6$
• D. Cr in $(NH_{4})_{2}Cr_{2}O_{7} = + 6$

Answer 1

Answer: (C)

P in $Mg_{2}P_{2}O_{7} = + 6$

Answer 2

: $Mg_{2}P_{2}O_{7} = + 5$

$2( + 2) + 2x - 14 = 0$

2x =10 $\Rightarrow$x=+5