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
In which of the compounds given below is there more than one kind of hybridisation $(sp,{\rm{ }}s{p^2},{\rm{ }}s{p^3})$ for carbon
→$(i)$ $C{H_3}C{H_2}C{H_2}C{H_3}$
$(ii)$ $C{H_3} - CH = CH - C{H_3}$
$(iii)$ $C{H_2} = CH - CH = C{H_2}$
$(iv)$ $H - C \equiv C - H$
Which of the following compounds will show highest dipole moment ?
Solubility product $(K_{sp})$ of the salts $MX\,,\, MX_2\,,\, M_3X$ at temperature $'T'$ are $4 \times 10^{-8}\,,\, 3.2 \times 10^{-14}$ and $2.7 \times 10^{-15}$ respectively. Solubilities of the salt at temperature $'T'$ are in the order
→Which of the following solutions can act as buffer
The overall complex dissociation equilibrium constant for the complex $[Cu(NH_3)_4]^{2+}$ ion will be ( $\beta _4$ for this complex is $2.1\times 10^{13}$ ) $\beta _4 =$ association constant
→Which of the following statements/ relationships is not correct in thermodynamic changes ?
Which of the following bond is weakest?
$STATEMENT-1$: $\quad \mathrm{Pb}^{4+}$ compounds are stronger oxidizing agents than $\mathrm{Sn}^{4+}$ compounds.and
→$STATEMENT-2$: The higher oxidation states for the group $14$ elements are more stable for the heavier members of the group due to 'inert pair effect'.
Which of the following molecule has net dipole moment zero?
If an electron has spin quantum number of $ + \frac{1}{2}$ and a magnetic quantum number of $ - 1$, it cannot be presented in an
→