Question

Which of the following is a decreasing order of oxidation states of the central atoms?

• A. $PCl_{5,}HIO_{4,}Cl_{2}O_{7}^{2 -},Cl_{2}O$
• B. $Cr_{2}O_{7}^{2 -},Cl_{2}O,HIO_{4},PCl_{5}$
• C. $HIO_{4},Cr_{2}O_{7}^{2 -},PCl_{5},Cl_{2}O$
• D. $Cr_{2}O_{7}^{2 -},HIO_{4},Cl_{2}O,PCl_{5}$

Answer 1

Answer: (C)

$HIO_{4},Cr_{2}O_{7}^{2 -},PCl_{5},Cl_{2}O$

Answer 2

: $Cl_{2}O \rightarrow 2x + 1( - 2) = 0 \Rightarrow x = + 1$

$Cr_{2}O_{7}^{2 -} \rightarrow 2x + 7( - 2) = - 2 \Rightarrow x = + 6$

$HIO_{4} \rightarrow + 1 + x + 4( - 2) = 0 \Rightarrow x = + 7$

$PCl_{5} \rightarrow x + ( - 5) = 0 \Rightarrow x = + 5$