MCQ
Elements of $3d$ series which does not show variable valency
- A$Fe, \,Zn$
- ✓$Sc, \,Zn$
- C$Mn, \,Zn$
- D$Ti,\, Co$
It can only lose two electrons from the $4 s$ orbital and show $+2$ oxidation state.
It does not show variable valency.
However, all other transition metals like $Mn , Fe, Cr$ have partially filled $d$ orbitals and hence, show variable valency.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
| Exp | $[A]$ | $[B]$ | Rate |
| $1$ | $0.012$ | $0.035$ | $0.10$ |
| $2$ | $0.024$ | $0.070$ | $0.80$ |
| $3$ | $0.024$ | $0.035$ | $0.10$ |
| $4$ | $0.012$ | $0.070$ | $0.80$ |
(Round of to the Nearest Integer).
(Given : $\left. R =8.314\, J\, mol ^{-1} K ^{-1}\right)$
| $(A)$ | $OSF_2$ | $OSCl_2$ | $OSBr_2$ |
| $(B)$ | $SbCl_3$ | $SbBr_3$ | $SbI_3$ |
| $(C)$ | $PI_3$ | $AsI_3$ | $SbI_3$ |