Chemical bonding & molecular structure practice · Medium

(A):A water molecule can form at the most four hydrogen bonds

(R): ice pices on pressing with each other join to give a single piece due to formation of hydrogen bonds in them

Assertion : The ${O}-{O}$ bond length in ${H}_2 {O}_2$ is shorter than that of ${O}_2 {~F}_2$.

Reason: ${H}_2 {O}_2$ is an ionic compound.

The bond order and magnetic behaviour of ${O}_2^{-}$ion are, respectively

Dipole moment is highest for:

A $\pi$-bond is formed by side way overlapping of

Molecule having largest number of $90^{\circ}$ bond angles is

Whenever a single Lewis structure cannot describe a molecule accurately, a number of structures with almost similar energy, position of nuclei, bonding and non-bonding pairs of electrons are taken as the canonical structures of the hybrid which describes the molecule accurately. This concept is known as

The bond energies of $\mathrm{F}_2, \mathrm{Cl}_2, \mathrm{Br}_2$ and $\mathrm{I}_2$ are 155 , 244,193 and $151 \mathrm{~kJ} / \mathrm{mol}$. The weakest bond will be in

Which among the following is not an exception
to Lewis octet rule ?

During change of ${\mathrm{O}_2}\,\mathrm{to}\,\,\mathrm{O}_2^ -$ ion, the electron adds on which one of the following orbitals?

The correct decreasing order of the boiling points of ${H_2}O,\,\,HF$ and $N{H_3}$ is

Which of the following diatomic molecules would be stabilized by the removal of an electron?

Read the following statements and choose the correct option. Here T stands for True and F stands for False statement.

(i) The smaller the size of the cation and the larger the size of the anion, the greater the covalent character of an ionic bond.

(ii) The smaller the charge on the cation, the greater the covalent character of the ionic bond.

(iii) For cations of the same size and charge, the one, with electronic configuration $(n-1) d^n n s^0$, typical of transition metals, is more polarising than the one with a noble gas configuration, $n s^2 n p^6$, typical of alkali and alkaline earth metal cations.

Statement-1: The number of bonding electrons in $N_2$ and $N_2^{-}$is same.

Statement-2: The bond order and bond length of $N_2{ }^{+}$ and $N_2^{-}$are same.

Assertion : Ionic compounds tend to be non-volalite.

Reason : Inter ionic forces in these compounds are strong.

Consider the following statements.
I. Bond enthalpy increases as bond order decreases
II. Bond length decreases as bond order increases
III. There is a effect of electronegativity on bond energy
Select the correct statement (s).

The correct order of increasing bond angles in the following species is:

Bond energy of ${Cl}_2, {Br}_2$ and ${I}_2$ follow the order

Statement-1: ${C}_2, {F}_2, {B}_2, {N}_2$ are diamagnetic species
Statement-2: Species with unpaired electrons only in anti bonding orbitals are paramagnetic

In ${He}_2$, the electrons in bonding and antibonding orbitals are

The pair of species having identical shape of both species:

Which of the following is correct order of $\sigma$ bond strength
I) 2S – 2S II) 2S – 2P III) 2P – 2P IV) 3S – 3S

Which of the following molecules does not possess a permanent electric dipole moment?

Which of the following statements are correct?
(A) Both $\mathrm{LiCl}\,\,\mathrm{and}\,\,\mathrm{MgC}{\mathrm{l}_\mathrm{2}}$ are soluble in ethanol.
(B) The oxides $\mathrm{L}{\mathrm{i}_\mathrm{2}}\mathrm{O}\,\,\,\mathrm{and}\,\,\mathrm{MgO}$ combine with excess of oxygen to give superoxide.
(C) $\mathrm{LiF}$ is less soluble in water than other alkali metal fluorides.
(D) $\mathrm{L}{\mathrm{i}_2}\mathrm{O}$ is more soluble in water than other alkali metal oxides.
Choose the most appropriate answer from the options given below:

Among the following species, identify the isostructural pairs

$\mathrm{NF}_3, \mathrm{NO}_3^{-}, \mathrm{BF}_3, \mathrm{H}_3 \mathrm{O}^{+}, \mathrm{HN}_3$

Bond angles of $\mathrm{N}{\mathrm{H}_3},\mathrm{P}{\mathrm{H}_3},\mathrm{As}{\mathrm{H}_3}$ and $\mathrm{Sb}{\mathrm{H}_3}$ is in the order

Which of the following has the lowest bond angle?

The hybrid state of 1 and 3 carbon atoms in $C{H_2} = C = C{H_2}$

In a crystal cations and anions are held together by

Among the following the weakest one is