Q8 of 24 Page 165

Classify the following based on atomicity:

i) Chlorine ii) Neon


iii) Phosphorous iv) Ozone

● chlorine is diatomic because its molecule contains 2 atoms of chlorine. Cl2

● neon is monoatomic because its molecule contains 1 atom of neon. Ne


● Phosphorous is polyatomic because its molecule contains 4 atoms of


phosphorous. If a molecule contains more than 3 atoms in its molecule its polyatomic. P4


● ozone is triatomic because its molecule contains 3 atoms of oxygen. O3


More from this chapter

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6

One mole of any substance contains 6.023 x 1023particles.

If 3.0115 x 1023 particles are present in CO2, find the number of moles.

 7

_________ have equal number of neutrons.

i) Isobars ii) Isotones


iii) Isotopes iv) Mass Numbers

 9

Identify and correct the mistake in each of the following:

i) The molar volume of gas at STP is 22.4 cm3.


ii) 2 x R.M.M. = V.D.


iii) An atom cannot exist independently.


iv) The ratio of atoms in a molecule may be integral or simple or may not be fixed.


v) H2O is a homo atomic molecule.

 10

Give a single term substitute for each of the following:

i) 6.023 x 1023 molecules ii) 22.4 litres of gas at STP


iii) 1/12th part of the mass of one atom of carbon


iv) The half of relative molecular mass


v) Molecular mass / atomic mass