MCQ
Which among the following elements have lowest value of $I{E_1}$
- A$Pb$
- ✓$Sn$
- C$Si$
- D$C$
✓
Answer
Correct option: B.
$Sn$
b
(b) The ionisation energy of tin {$Sn$} is less than that of lead ($Pb$).
(b) The ionisation energy of tin {$Sn$} is less than that of lead ($Pb$).
It is due to the poor shielding of $d$- and $f-$electron in $Pb$ due to which it feels greater attraction from nucleus.
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
The formula of a gaseous hydrocarbon which requires $6$ times of its own volume of $O _{2}$ for complete oxidation and produces $4$ times its own volume of $CO _{2}$ is $C _{ x } H _{ y }$. The value of $y$ is ...... .
→Give
The product E is :
The product E is :
Which of these do not contain $ - COOH$ group
→Iodoform on heating with $KOH$ gives
→The entropy change, in the conversion of one mole of liquid water at $373 \,K$ to vapour at the same temperature is (Latent heat of vaporization of water, $\Delta {H_{vap}} = 2.257\,kJ/g)$ ........$J\,{k^{ - 1}}$
→Assertion : The presence of nitro group facilitates nucleophilic substitution reactions in aryl halides.
Reason : The intermediate carbanion is stabilized due to the presence of nitro group.
Reason : The intermediate carbanion is stabilized due to the presence of nitro group.
The solubility product of $AgI$ at $25\,^oC$ is $1.0 \times {10^{ - 16}}\,mo{l^2}\,{L^{ - 2}}$. The solubility if $AgI$ in ${10^{ - 4}}\,N$ solution of $KI$ at $25\,^oC$ is approximately (in $mol$ ${l^{ - 1}})$
→Identify conformer of $2-$ methyl pentane
→For an endothermic reaction where $\Delta H$ represents the enthalpy of the reaction in kJ/mole, the minimum value for the energy of activation will be
→$D- (+)- Glyceraldehyde \xrightarrow[(ii) H_2O/H^+(iii)HNO_3]{(i)HCN}$
→The products formed in the above reaction are