Q9 of 24 Page 165

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.

(i) The molar volume of gas at STP is 22.4 litres (not cm3.)


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


(iii) An atom may or may not exist independently. Atoms like Fe, Na


can exist independently.


(iv) The ratio of atoms in a molecule may be fixed and integral but


may not be simple.


(v) H2O is a hetero atomic molecule. It contains more than one type


of atoms i.e hydrogen and oxygen. So, it’s a hetero atomic molecule , not homo atomic molecule.


More from this chapter

All 24 →
7

_________ have equal number of neutrons.

i) Isobars ii) Isotones


iii) Isotopes iv) Mass Numbers

 8

Classify the following based on atomicity:

i) Chlorine ii) Neon


iii) Phosphorous iv) Ozone

 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

 1

Modern atomic theory takes up the wave concept, principle of uncertainty and other latest discoveries to give a clear-cut picture about an atom. State the findings of modern atomic theory.