Property of transition element
1) Color of ion
2) Variable oxidation states
3) Formation of alloys
4) Paramagnetic
Reason for the property
A) unpaired e- in (n-1)d orbital
B) same crystal structure
C) d-d- transition
D) high magnitude of positive charge
E) slight energy between ns and (n–1)d shells
The correct match is

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1-C, 2-E, 3-A, 4-B

1-C, 2-E, 3-B, 4-A

1-C, 2-B, 3-E, 4-A

1-B, 2-A, 3-E, 4-B

answer is B.

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Detailed Solution

The color of the coordination complexes is due to the d-d transition takes place in the complexes.
Metals of the coordination complexes are transition metals and they shows variable oxidation states because there is very less energy difference between ns and (n-1)d subshells.
Transition metals has a very less difference in their atomic sizes, thereby one metal easily replaced by another metal from its lattice for the formation of an alloy.
Paramagnetic nature is due to the presence of unpaired electrons in the outermost d subshell.

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