Structure and Properties of Matter - A stable molecule has less energy than the same set of atoms separated; one must provide at least this energy in order to take the molecule apart.

For phenol, which of the following resonating structure is the most stable?

Among these canonical structures, the correct order of stability is

Which of the following statements are true.

(i) In the structure of  ${\text{HNO}}_{\text{3}},$  the  $\text{N}-\text{O}$  bond $\left(121\text{pm}\right)$ is shorter than the  $\text{N}-\text{OH}$  bond $\left(\mathrm{140 }\text{pm}\right).$

(ii) All the  $\text{P}-\text{Cl}$  bonds in  ${\text{PCl}}_{\text{5}}$  are not equivalent.

(iii)  $\text{I}-\text{Cl}$  is more reactive than  ${\text{I}}_2.$

${\mathrm{H}}_2\mathrm{O}$a covalent solid.

Generally which is the larger charge in size one positive charge or one negative charge?

In acetylene molecule, $\mathrm{C}-\mathrm{H}$ sigma bond is formed by:

Amongst the following, the total number of species NOT having eight electrons around central atom in its outer most shell, is

${\mathrm{NH}}_3, {\mathrm{AlCl}}_3, {\mathrm{BeCl}}_2, {\mathrm{CCl}}_4, {\mathrm{PCl}}_5$

The number of molecules from the following which contain only two lone pair of electrons is _____________

${\mathrm{H}}_2\mathrm{O},{\mathrm{N}}_2,\mathrm{CO},{\mathrm{XeF}}_4,{\mathrm{NH}}_3,\mathrm{NO},{\mathrm{CO}}_2, {\mathrm{F}}_2$

. Identify the correct order of standard enthalpy of formation of sodium halides.

The bond order and magnetic property of acetylide ion are same as that of

Consider the following statement

(A) ${\mathrm{NF}}_3$ molecules has a trigonal planar structure.

(B) Bond Length of ${\mathrm{N}}_2$ is shorter than ${\mathrm{O}}_2$.

(C) Isoelectronic molecules or ions have identical bond order.

(D) Dipole moment of ${\mathrm{H}}_2\mathrm{S}$ is higher than that of water molecule.

Choose the correct answer from the options given below:

How do cations and anions of an ionic compund exist in its solid state ?

What is a Sigma bond?

Draw the structure of tetra cyano ethylene.

$\mathrm{NaCl}$ is not a conductor of electricity in solid state whereas it does conduct electricity in aqueous solution as well as in molten state.

Calculate the number of lone pairs and bond pairs in ${\mathrm{SO}}_3$ molecule.

Write Lewis dot structure of carbon tetrachloride.

The number of electron pairs shared by the two carbon atoms which are bounded by a triple bond are: