MCQ
A transition element $X$ has a configuration $\left[ {Ar} \right]3{d^4}$ in its $+ 3 $ oxidation state. Its atomic number is
- ✓$25$
- B$26$
- C$22$
- D$19$
${X^{ + 3}} = 18 + 4 = 22$
Number of electrons in ground state
$X = 22 + 3 = 25$.
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$A$. The strength of anionic ligands can be explained by crystal field theory.
$B$. Valence bond theory does not give a quantitative interpretation of kinetic stability of coordination compounds.
$C$. The hybridization involved in formation of $\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}$ complex is $\mathrm{dsp}^2$.
$D$. The number of possible isomer$(s)$ of cis- $\left[\mathrm{PtCl}_2(\text { en })_2\right]^{2+}$ is one
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