Which of the following statements are true?

CHEMISTRY · Multi correct · CBSE · Chemistry · Coordination Compounds · Coordination Compounds

Problem

Which of the following statements are true? (1) In metal carbonyl complexes,

d_{\mathrm{C-O}}

increases compared with that in a

\mathrm{CO}

molecule. (2) The pair

[\mathrm{Cr(H_2O)_6}]\mathrm{Cl}_3

and

[\mathrm{CrCl_3(H_2O)_3}]\cdot3\mathrm{H_2O}

shows hydrate isomerism. (3) The

d_{z^2}

orbital of the central metal atom or ion is used in

dsp^2

hybridization. (4) Facial and meridional isomers of

[\mathrm{Ma_3b_3}]^{n\pm}

complexes are both optically inactive.