Question

The following facts are available
$2X^{-} + Y_{2} \to 2Y^{-}+ X_{2}$
$2W^{-} + Y_{2} \to$ No reaction
$2Z^{-}+ X_{2} \to 2X^{-} + Z_{2}$
Which of the following statements is correct?

• A. $E^{o}_{W^{-}/W_{2}} > E^{o}_{Y^{-}/Y_{2}} >E^{o} _{X^{-} /X_{2}} >E^{o} _{Z^{-}/Z_{2}}$
• B. $E^{o}_{W^{-}/W_{2}} < E^{o}_{Y^{-}/Y_{2}} < E^{o} _{X^{-} /X_{2}} < E^{o} _{Z^{-}/Z_{2}}$
• C. $E^{o}_{W^{-}/W_{2}} < E^{o}_{Y^{-}/Y_{2}} >E^{o} _{X^{-} /X_{2}} >E^{o} _{Z^{-}/Z_{2}}$
• D. $E^{o}_{W^{-}/W_{2}} > E^{o}_{Y^{-}/Y_{2}} < E^{o} _{X^{-} /X_{2}} < E^{o} _{Z^{-}/Z_{2}}$

Answer 1

Answer: (B)

$2X^{-} +Y_{2} \to2Y^{-} +X_{2} \to E^{o} _{Y_{2}/Y^{-}} >E^{o} _{X_{2}/X^{-}}$
$2Z^{-} +X_{2} \to2X^{-} +Z_{2} \to E^{o} _{X_{2}/X^{-}} >E^{o} _{Z_{2}/Z^{-}}$
$2W^{-} +Y_{2} \to no \,reaction \Rightarrow E^{o} _{W_{2}/W^{-}} >E^{o}_{Y_{2} /Y^{-}}$