MCQ
What will be the order of Ist ionisation energy
- ✓$Li > Na > K$
- B$K > Li > Na$
- C$Na > Li > K$
- D$Li > K > Na$
✓
Answer
Correct option: A.
$Li > Na > K$
a
(a) In a group, the ionisation potential decreases from top to bottom. In the alkali group, the ionisation potential decreases from $Li$ to $Cs$
(a) In a group, the ionisation potential decreases from top to bottom. In the alkali group, the ionisation potential decreases from $Li$ to $Cs$
$ Li$ $Na$ $K$ $Rb$ $cs$
$eV $ $5.3$ $5.1$ $4.3$ $4.2$ $3.9$
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
Which pair of molecules are polar species?
Nitrogen has lower electron affinity than its preceeding element carbon because
The reaction of benzene with chlorine in the presence of iron gives
Which is formed when fluorine react with hot and concentrated sodium hydroxide
Total number of stereoisomers possible for following compound is
Number of paramagnetic oxides among the following given oxides is ..... .
→$\mathrm{Li}_{2} \mathrm{O}, \mathrm{CaO}, \mathrm{Na}_{2} \mathrm{O}_{2}, \mathrm{KO}_{2}, \mathrm{MgO}$ and $\mathrm{K}_{2} \mathrm{O}$
$C{H_3} - C \equiv CH\xrightarrow{{Na}}X\xrightarrow{{C{H_3} - Cl}}Y$, $Y$ is
→Which one of the following is most soluble
For a dilute solution containing $2.5\, g$ of a nonvolatile non-electrolyte solute in $100\, g$ of water, the elevation in boiling point at $1$ atm pressure is $2\,^oC$. Assuming amount of solute is much lower than the amount of solvent, the vapour pressure ($mm$ of $Hg$) of the solution is :-
→(take $K_b = 0.76\, K \,kg \,mol^{-1}$)
The ratio of charge and mass would be greater for