Embibe Experts Solutions for Chapter: Chemical Bonding and Molecular Structure, Exercise 1: WBJEE 2019

The melting points of (i) ${\mathrm{BeCl}}_2$ (ii) ${\mathrm{CaCl}}_2$and (iii)${\mathrm{HgCl}}_2$ follows the order

The molecule/molecules that has/have delocalised lone pair(s) of electrons is/are

The $\mathrm{H}-\mathrm{N}-\mathrm{H}$ angle in ammonia is $107.6°,$ while the $\mathrm{H}-\mathrm{P}-\mathrm{H}$ angle in phosphine is $93.5°.$Relative to phosphine, the$\mathrm{p}$ -character of the lone-pair on ammonia is expected to be

Which of the following has the strongest H-bond ?

Bond order of ${\mathrm{He}}_2 , {\mathrm{He}}_2^{+}$ and ${\mathrm{He}}_2^{2+}$ are respectively

A homonuclear diatomic gas molecule shows $2$-electron magnetic moment. The one-electron and two-electron reduced species obtained from above gas molecule can act as both oxidising and reducing agents. When the gas molecule is one-electron oxidised the bond length decreases compared to the neutral molecule. The gas molecule is

Which of these species will have non-zero magnetic moment?

Which statements are correct for the peroxide ion ?