The volume occupied by 4.4 g of CO₂ at S.T.P

(a)

22.4 litre

(b)

2.24 litre

(c)

0.24 litre

(d)

0.1 litre

Which of the following represents 1 amu?

(a)

Mass of a C – 12 atom

(b)

Mass of a hydrogen atom

(c)

1/12^th of the mass of a C – 12 atom

(d)

Mass of O – 16 atom

The volume occupied by 1 mole of a diatomic gas at S.T.P is

(a)

11.2 litre

(b)

5.6 litre

(c)

22.4 litre

(d)

44.8 litre

1 mole of any substance contains __________ molecules

(a)

6.023 × 10²³

(b)

6.023 × 10^-23

(c)

3.0115 × 10²³

(d)

12.046 × 10²³

Atoms of different elements with different atomic numbers, but same mass number are known as _________

(a)

isobars

(b)

isotopes

(c)

isotones

(d)

isomers

Identify the 'hetero nuclear tri atomic molecule' among the following.

(a)

P₄

(b)

H₂SO₄

(c)

CO₂

(d)

O₃

Which of the following statement regarding an atom is always correct?

(a)

An atom has equal number of electrons and protons

(b)

An atom has equal number of electrons and neutrons

(c)

An atom has equal number of electrons, protons and neutrons

(d)

An atom has equal number of protons and neutrons

The atomic number of an element is 12 and its mass number is 24. The number of electrons, protons and neutrons respectively will be

(a)

12, 12, 24

(b)

24,12,12

(c)

12,12,12

(d)

12, 24,12

The relative atomic masses of many elements are not whole number because

(a)

they are not determined accurately

(b)

they exist as isotopes

(c)

due to impurities

(d)

atoms ionize

The total number of electrons present in 16 g of methane gas is

(a)

96.352 x 10²³

(b)

48.176 x 10²³

(c)

6.023 x 10²³

(d)

30.11 x 10²³

The number of particles present in one mole of any substance is equal to

(a)

6.023 x 10²³

(b)

60.23 x 10²³

(c)

6.023 x 10²⁷

(d)

60.23 x 10²⁷

The number of molecules in 16.0 g of oxygen is:

(a)

6.023 x 10²³

(b)

6.023 x 10^-23

(c)

3.01 x 10^-23

(d)

3.0115 x 10²³

Adding electrons to an atom will result in a (an):

(a)

Molecule

(b)

Anion

(c)

Cation

(d)

Salt

The total number of atoms represented by the compound CuSO₄. 5H₂O is

(a)

27

(b)

21

(c)

5

(d)

8

How many molecules are present in one gram of hydrogen?

(a)

6.023 x 10²³

(b)

3.0115 x 10²³

(c)

2.5 x 10²³

(d)

1.5 x 10²³