EASY

Earn 100

molecule contains three atoms of oxygen and has a formula O₃.

50% studentsanswered this correctly

Important Questions on Atoms and Molecules

HARD

Science>Chemistry>Atoms and Molecules>Molecule

The melting point of naphthalene is

80 ° C

and the room temperature is

30 ° C

. A sample of liquid naphthalene at

100 ° C

is cooled down to the room temperature. Draw a temperature time graph to represent this cooling. In the graph, mark the region which corresponds to the freezing process.

EASY

Science>Chemistry>Atoms and Molecules>Molecule

Atomicity of oxygen in ozone molecule is

MEDIUM

Science>Chemistry>Atoms and Molecules>Molecule

The graph of

\ln (\frac{R}{R_{0}})

versus

\ln A

(

R =

radius of a nucleus and

A =

mass number) is

EASY

Science>Chemistry>Atoms and Molecules>Molecule

Which among the given options is not an inert gas?

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.

HARD

Science>Chemistry>Atoms and Molecules>Molecule

In a Davisson-Germer experiment, Helium atoms were used in place of electrons. What should be the energy of Helium so that a strong peak of scattered He appears at an angle of

50 °,

as was the case with electrons having an energy of

54 eV ?

(Take mass of

He

atoms to be

7500

times the mass of electrons)

EASY

Science>Chemistry>Atoms and Molecules>Molecule

The mass number and the volume of a nucleus is

M

and

V

respectively. If the mass number is increased to

2 M

then the volume is changed to

EASY

Science>Chemistry>Atoms and Molecules>Molecule

Which of the following is diatomic molecule of an element?

EASY

Science>Chemistry>Atoms and Molecules>Molecule

The atomicity of ozone molecule is:

EASY

Science>Chemistry>Atoms and Molecules>Molecule

Give two examples of diatomic molecules of an element.

EASY

Science>Chemistry>Atoms and Molecules>Molecule

The ratio of masses of carbon and oxygen is 3:8 and their atomic masses are 12 and 16 in one molecule of carbon dioxide. The ratio of atoms of carbon and oxygen in carbon dioxide is:

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

State the number of atoms present in