Which of the following is a triatomic molecule?

(a)

Glucose

(b)

Helium

(c)

Carbon dioxide

(d)

Hydrogen

Mass of 1 mole of Nitrogen atom is

(a)

28 amu

(b)

14 amu

(c)

28 g

(d)

14 g

Which of the following statement is incorrect?

(a)

12 gram of C – 12 contains Avogadro’s number of atoms.

(b)

One mole of oxygen gas contains Avogadro’s number of molecules

(c)

One mole of hydrogen gas contains Avogadro’s number of atoms

(d)

One mole of electrons stands for 6.023 × 10²³ electrons.

In the nucleus of ₂₀Ca⁴⁰, there are 

(a)

20 protons and 40 neutrons

(b)

20 protons and 20 neutrons

(c)

20 protons and 40 electrons

(d)

40 protons and 20 electrons

1 mole of any substance contains __________ molecules

(a)

6.023 × 10²³

(b)

6.023 × 10^-23

(c)

3.0115 × 10²³

(d)

12.046 × 10²³