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Match List-I with List-II.
List - I List - II
A) "Element which exhibits "+3 "oxidation state only " I) Mn
B) "Element which exhibits more number of oxi- dation states" II) Zn
C) "Element which is a reducing agent in its "+2 "oxidation state" III) Sc
D) " Element which is not considered as a transition element" IV) Cr
Choose the correct answer from the options given below:
A B C D
1. IV I II III
2. II IV III I
3. III II IV I
4. III IV I II

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answer is C.

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Detailed Solution

(a)	"Element which exhibits +3 oxidation" "state only "	(iii)	$\begin{array}{l} Sc [1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{1}] {Sc}^{+ 3} \\ [1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{0} 3 d^{0}] \end{array}$
(b)	"Element which" "exhibits more number of oxidation states "	(i)	$Mn [1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{5}]$ " (oxidation state from "+2so+7)
(c)	"Element which is a reducing agent in its "+2" oxidation" "state"	(iv)	$\begin{array}{l} Cr [1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1} 3 d^{5}] {Cr}^{+ 2} \\ [1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{0} 3 d^{4}] {Cr}^{+ 2} \end{array}$ "acts as a reducing agent, " Cr^(+3) " is stable because of its half - filled " t_2g³e_g⁰" configuration "
(d)	"Element" "which" "is not considered as a transition" "element"	(ii)	$\begin{array}{l} Zn [1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d 10] {Zn}^{+ 2} \\ [1 s^{2} 2 s^{2} 2 p 63 s^{2} 3 p^{6} 4 s^{0} 3 d^{10}] \end{array}$ "as it is pseudo transition element"

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