Chemical bonding & molecular structure practice · Medium

Assuming $2 s-2 p$ mixing is NOT operative, the paramagnetic species among the following is

Octet rule is not valid for the molecule:

Which of the following corresponds unstable molecule? Here ${N}_{{b}}$ is number of bonding electrons and ${N}_{{a}}$ is number of antibonding electrons.

Amongst $\mathrm{LiCl}, \mathrm{RbCl}, \mathrm{BeCl}_2$ and $\mathrm{MgCl}_2$ the compounds with the greatest and the least ionic character, respectively are:

Of the following hydrides which has the lowest boiling point

Which one of the following conversion involve change in both by hybridisation and shape?

Which hybridization results non-polar orbitals?

Which one of the following is not paramagetic?

Statement I: $\mathrm{ClO}_3^{-}$and $\mathrm{SO}_3{ }^{2-}$ has three bond pair so according to VSEPR theory it has tetrahedral geometry and $\mathrm{sp}^3$ hybridization.

Statement II: $\mathrm{ClO}_3{ }^{-}$and $\mathrm{SO}_3{ }^{2-}$ has tetrahedral shape.

Identify the non-polar molecule in the set of compounds given $HCl$, $HF$,${\mathrm{H}_2}$ $HBr$

The polarising ability of which one of the following is highest?

Glycerol is more viscous than ethanol due to

Most covalent halide of aluminium is:

Which of the following is least ionic?

In which of the following pairs molecules have bond order three and are isoelectronics

Assertion : Nitrogen is unreactive at room temperature but becomes reactive at elevated temperature (on heating or in the presence of catalysts).

Reason : In nitrogen molecule, there is extensive delocalization of electrons.

Which amongst the following incorrect statement?

Assertion: HF has more dipole moment than HCl.

Reason: For above, higher the electronegativity difference, higher the dipole moment.

The correct set from the following in which both pairs are in correct order of melting point is

Which pair of diatomic species do not have same bond order?

The element which exists in both hard and soft form is:

Which of the following species contains only $\pi$-bond(s)?

The stability of the species $N{O_2},\,NO_2^ + \,\,\,{\text{and}}\,{\text{ }}NO_2^ -$ is in the order

Correct order of bond angle is:

The electronic configuration of $4$ elements $K,L,M\,\,\mathrm{and}\,\,N$ are,
$\begin{array}{l} K = 1{s^2},2{s^2}2{p^1}\,\,\,\,\,L = 1{s^2},2{s^2}2{p^6}\\ M = 1{s^2},2{s^2}2{p^4}\,\,\,\,N = 1{s^2},2{s^2}2{p^3} \end{array}$
The element that would form a diatomic molecule with double bond is:

If $\mathrm{N}{\mathrm{a}^ + }$ ion is larger than $\mathrm{M}{\mathrm{g}^{2 + }}$ ion and ${\mathrm{S}^{2 - }}$ is larger than $\mathrm{C}{\mathrm{l}^ - }$ ion, which of the following will be stable soluble in water?

Which atomic orbital is always involved in sigma bonding only?

Statement-I: $\mathrm{H}-\mathrm{H}$ bond is weaker than $\mathrm{D}$ - $\mathrm{D}$ bond

Statement-II: $\mathrm{H}-\mathrm{H}$ bond is longer than $\mathrm{D}$ - $\mathrm{D}$ bond

The bond length the species ${O}_2, {O}_2^{+}$and ${O}_2^{-}$are in the order of

There will be no change in hybridization when: