The following W,X,Y,Z form diatomic molecules and also form singly charged negative ion.Th e following observation are made in a series of experiments:
$2 A + Y_{2} \to 2 Y + X_{2}$
$2 W + Y_{2} \to$ no reaction
$2 Z + X_{2} \to 2 X + Z_{2}$

Which ion is the strongest reducing agent?

Y^{-}

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X^{-}

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Z^{-}

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W^{-}

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Solution

The correct option is C $Z^{-}$
Oder of reducing property :
reaction 1 : $X^{-} > Y^{-}$
reaction 2 : $Y^{-} > W^{-}$
reaction 3 : $Z^{-} > X^{-}$
overall order : $Z^{-} > X^{-} > Y^{-} > W$
So, strongest reducing agent is $Z^{-}$ .

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