MCQ
Zinc and mercury do not show variable valency like $d-$ block elements because
- AThey are soft
- ✓Their $d- $ shells are complete
- CThey have only two electrons in the outermost subshell
- DTheir $d-$ shells are incomplete
✓
Answer
Correct option: B.
Their $d- $ shells are complete
b
(b)$_{30}Zn$ and $_{80}Hg$ have their $d$ orbitals completely filled so they do not show any variable valency.
(b)$_{30}Zn$ and $_{80}Hg$ have their $d$ orbitals completely filled so they do not show any variable valency.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
In the following molecule, the two carbon atoms marked by asterisk (*) possess the following type of hybridized orbitals ${H_3}C - {C^*} \equiv {C^*} - C{H_3}$
→A gas is allowed to expand in a well insulated container against a constant external pressure of $2.5\ atm$ from an initial volume of $2.50\ L$ to a final volume of $4.50\ L.$ The change in internal energy $\Delta U$ of the gas in joules will be .............. $\mathrm{J}$
→Following eclipsed form of propane is repeated after rotation by an angle of......$^o$
→For a chemical reaction, $A + 2B \to C + D$, the rate of reaction increases three times, when concentration of $A$ only is increased nine times. While when concentration of $B$ only is increased $2\, times$, then rate of reaction also increases $2\, times$. The order of this reaction is
→Copper cannot replace….. from solution
Which of the ligands can show linkage isomerism :
What is the value of electron gain enthalpy of $Na^+$ if $IE_1$ of $Na \ 5.1\ eV$ ? .......... $\mathrm{eV}$
→The final product $\mathrm{A}$, formed in the following multistep reaction sequence is:
→In the reaction the major product formed is
If one strand of $DNA$ has the sequence $ATCGTATG$, the sequence in the complementary strand would be
→