The smallest particle of matter which is capable of independent existence and which exhibits the properties of the matter is called the molecule of the matter. Example of molecules are O 2 , N 2 , H 2 and P 4 etc.

MEDIUM

Earn 100

Find the ratio by mass of the combining elements in the given compound.

${HNO}_{3}$

Important Questions on Atoms and Molecules

EASY

Science>Chemistry>Atoms and Molecules>Molecule

Atomicity of oxygen in ozone molecule is

MEDIUM

Science>Chemistry>Atoms and Molecules>Molecule

Select the correct options from the following statements:

I. ${}_{6}^{12}C$ and ${}_{6}^{14}C$ are isobars of each other.

II. ${}_{6}^{12}C$ reacts with ${}_{8}^{16}O$ to form a product which contains ionic bonds.

III. ${}_{20}^{40}{Ca}$ and ${}_{18}^{40}{Ar}$ are isobars of each other.

IV. ${}_{20}^{40}{Ca}$ reacts with ${}_{8}^{16}O$ to form a compound whose aqueous solution is known as lime water.

EASY

Science>Chemistry>Atoms and Molecules>Molecule

Give two examples of molecules having only one kind of atoms.

EASY

Science>Chemistry>Atoms and Molecules>Molecule

Give two examples of molecules having three different kinds of atoms.

HARD

Science>Chemistry>Atoms and Molecules>Molecule

Find the ratio by mass of the combining elements in the following compounds.
[At mass of:

Ca = 40, C = 12, O = 16, H = 1, Mg = 24, Cl = 35.5, N = 14, S = 32

]
(a)

{CaCO}_{3}

(b)

{MgCl}_{2}

(c)

H_{2} {SO}_{4}

(d)

C_{2} H_{5} OH

(e)

{NH}_{3}

(f)

Ca (OH)_{2}

EASY

Science>Chemistry>Atoms and Molecules>Molecule

The ratio of masses of sulphur and oxygen is 2:3 and their atomic masses are 32 and 16 in one molecule of sulphur trioxide. The ratio of atoms of sulphur and oxygen in sulphur trioxide is:

MEDIUM

Science>Chemistry>Atoms and Molecules>Molecule

Classify each of the following on the basis of their atomicity.
(a)