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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 mor" e "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 element" IV) Cr
Choose the correct answer from the options given below:

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A	B	C	D
III	I	IV	II

A	B	C	D
II	IV	III	I

A	B	C	D
IV	I	II	III

A	B	C	D
III	IV	I	II

answer is C.

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Detailed Solution

(a)	Element which exhibits +3 oxidation state only	(iii)	$Sc [1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{'}] {Sc}^{+ 3} [1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{0} 3 d^{0}]$
(b)	Element which exhibits more number of oxidation states	(i)	$M n [1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{5}]$ (oxidation state from +2 so +7)
(c)	Element which is a reducing agent in its +2 oxidation state	(iv)	$Cr [1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1} 3 d^{5}] {Cr}^{+ 2} [1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{0} 3 d^{4}] {Cr}^{+ 2}$ acts as a reducing agent, Cr⁺³ is stable because of its half–filled $t_{2 g} e_{g}^{0}$ conf gura-tion
(d)	Element which is not considered as a transition element	(ii)	$Zn [1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d 10] {Zn}^{+ 2} 1 s^{2} 2 s^{2} 2 p 63 s^{2} 3 p^{6} 4 s^{0} 3 d^{10}]$ as it is pseudo transition element

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