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

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

The mass of an atom is measured in ____________

(a)

kg

(b)

amu

(c)

g

(d)

Pm

Pick out the isotopes among the following pairs

(a)

₆C¹³, ₇N¹⁴

(b)

₁₈Ar⁴, ₂₀Ca⁴

(c)

₆C¹², C₆¹⁴

(d)

₅B¹², ₆C¹³

Which among the following is a homo atomic molecule?

(a)

N₂

(b)

NH₃

(c)

HCl

(d)

N₂O

The number of atoms present in a molecule is called its ____________

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atomicity

One mole of any gas occupies ________ ml at S.T.P

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22400

Atomicity of phosphorous is ___________

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4

The mass of the molecule of an element or compound is measured in ______________ scale.

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C^-12

The value of Avogadro's number is ______________

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6.023 x 10²³

8 g of O₂

(1)

H₂

4 g of H₂

(2)

2 moles

52 g of He

(3)

0.25 moles

Monoatomic

(4)

He

Diatomic

(5)

13 moles