Question

The correct sequence of the oxidation state of underlined elements is

$Na_{2}\lbrack Fe(CN)_{5}NO\rbrack,K_{2}TaF_{7},Mg_{2}P_{2}O_{7},Na_{2}S_{4}O_{6},N_{3}H$

• A. $+ 3, + 5, + 5, + 2.5, - \frac{1}{3}$
• B. $+ 5, + 3, + 5, + 3, + \frac{1}{3}$
• C. $+ 3, + 3, + 5, + 5, - \frac{1}{3}$
• D. $+ 5, + 5, + 3, + 2.5, + \frac{1}{3}$

Answer 1

Answer: (A)

$+ 3, + 5, + 5, + 2.5, - \frac{1}{3}$

Answer 2

: $Na_{2}\lbrack\underline{Fe}(CN)_{5}NO\rbrack: + 2 + x + 5( - 1) + 0 = 0 \Rightarrow x = + 3$

$K_{2}\underline{Ta}F_{7}: + 2 + x + ( - 7) = 0 \Rightarrow x = + 5$

$Mg_{2}{\underline{P}}_{2}O_{7}: + 4 + 2x + ( - 14) = 0 \Rightarrow x = + 5$

${\underline{N}}_{3}H:3x + 1 = 0 \Rightarrow x = - \frac{1}{3}$