Chemical bonding & molecular structure practice · Medium

In which of the following ionisation processes, the bond order has increased and the magnetic behaviour has changed

Which among the following is/are paramagnetic in nature?

Which amongst the following is incorrect statement?

Which of the following halogens has the highest bond energy

Two elements $X$ and $Y$ have following electronic configuration
$X = 1{s^2}\,2{s^2}2{p^6}\,\,3{s^2}3{p^6}\,\,4{s^2}$
$Y = 1{s^2}\,2{s^2}2{p^6}\,\,3{s^2}3{p^5}\,$
The expected compound formed by combination of $X$ and $Y$ will be expressed as

The bond order of $\mathrm{CO}$ molecule on the basis of molecular orbital theory is:

Some of the properties of the two species, $\mathrm{NO}_3^ -$ and ${\mathrm{H}_3}{\mathrm{O}^ + }$ are described below. Which one of them is correct?

Which bond in a molecule of ethyl magnesium bromide is ionic in nature?

Decreasing order of bond angle is

Bond order of $N_2^{+}$and $N_2^{-}$are same. Which relation is correct for $N_2^{+}$and $N_2^{-}?$

Which does not contain sigma bond:

Assertion : ${ClF}_3$ has $\mathrm{T}$-shape structure.

Reason : It has two lone pair arrange at $180^{\circ}$ (Angle).

Which of the following is diamagnetic

The decreasing order of bond dissociation energies of $\mathrm{C}-\mathrm{C}, \mathrm{C}-\mathrm{H}$ and $\mathrm{H}-\mathrm{H}$ bonds in

Assertion (A): The order of thermal stability of

$\mathrm{Li}_2 \mathrm{CO}_3< \mathrm{Na}_2 \mathrm{CO}_3< \mathrm{K}_2 \mathrm{CO}_3< \mathrm{Rb}_2 \mathrm{CO}_3< \mathrm{Cs}_2 \mathrm{CO}_3$

Reason (R): As we go

$\mathrm{Li}_2 \mathrm{CO}_3 \rightarrow \mathrm{Na}_2 \mathrm{CO}_3 \rightarrow \mathrm{~K}_2 \mathrm{CO}_3 \rightarrow \mathrm{Rb}_2 \mathrm{CO}_3 \rightarrow \mathrm{Cs}_2 \mathrm{CO}_3$

ionic character of carbonates increases.

Given below are two statements:

Assertion (A): Double bond in carbon molecule $\left(C_2\right)$ is consist of two pi-bonds.

Reason (R): Due to presence of four electrons in two pi-molecular orbitals.

In the light of the above statements, choose the most appropriate answer from the options given below:

In which of the following hydrogen bond is present?

Dipole-dipole interaction energy between stationary polar molecules is proportional to

${\mathrm{N}_2}$ and ${\mathrm{O}_2}$ are converted into monocations, $\mathrm{N}_2^ +$ and $\mathrm{O}_2^ +$ respectively. Which of the following is wrong?

Which has the highest bond energy?

In which of the following, unpaired electrons are present? $\mathrm{K}{\mathrm{O}_2},\mathrm{AlO}_2^ - ,\mathrm{Ba}{\mathrm{O}_2},\mathrm{NO}_2^ +$

Among the following, the molecule of high dipole moment is

Of which of the following hybridisation is not the same as in the other three

Which statement is wrong?

The number of unpaired electrons in ${\mathrm{O}_2}$ molecule is:

Which postulation provide the basis for the modern concepts regarding ion formation by electron transfer and the formation of ionic crystalline compounds?

If $\mathrm{Na}^{+}$ion is larger than $\mathrm{Mg}^{2+}$ ions and $\mathrm{S}^{2-}$ ion is larger than $\mathrm{Cl}^{-}$ion, which of the following will be stable salt in water?

$\mathrm{N}\left(\mathrm{SiH}_3\right)_3$ has -

Which of the following statement are correct:
(a) $\mathrm{O}_2$ is paramagnetic and $\mathrm{O}_3$ is diamagnetic
(b) $\mathrm{O}_2$ and $\mathrm{B}_2$ both are paramagnetic
(c) $\mathrm{B}_2$ and $\mathrm{C}_2$ both are paramagnetic
(d) $\mathrm{O}_2$ is paramagnetic but $\mathrm{B}_2$ is diamagnetic.

Which one of the following is not the resonance structure of ${CO}_2$ ?