The correct statement among the following is

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The colour of
${Cr}_{2} O_{7}^{2 -}$ ion is due to d-d tran-
sition of unpaired electrons

Transition elements form a large number
of alloys, because of similar boiling points

Bronze is an alloy of Copper and Zinc

Salt of ${Fe}^{+ 2}$ ion has greenish colour

answer is C.

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Detailed Solution

1) The color of ${Cr}_{2} O_{7}^{2 -}$ ion is basically due to the ligand metal charge transfer. There is no unpaired electron of $Cr$ is present in the $3 d and 4 s$ orbitals of $Cr$ .

2) The transition metals can easily form alloys because they have very similar atomic sizes which leads their nature towards alloy formation. As they are having very similar atomic sizes, a metal can replace another metal from its lattice and create a solid solution.

3) Bronze is an alloy of $Cu and Zn$ .

4) ${Fe}^{+ 2}$ salt has pale blue/ green color.

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