atomic structure molecules and nuclear chemistry - Category wise Question and Answer Practice Test with Solutions

Question : 26

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

a) 21

b) 5

c) 27

d) 8

Question : 27

Which of the following is not a basic particle of an element?

a) A molecule

b) An ion

c) An atom

d) None of these

Question : 28

The molecular formula P₂O₅ means that

a) there are twice as many P atoms in the molecule as there are O atoms

b) the ratio of the mass of P to the mass of O in the molecule is 2:5

c) a molecule contains 2 atoms of P and 5 atoms of O

d) the ratio of the mass of P to the mass of O in the molecule is 5 : 2

Question : 29

By whom was neutron discovered?

a) Chadwick

b) Rutherford

c) Bohr

d) Dalton

Question : 30 [CDS]

Which one among the following statements about an atom is not correct?

a) Atoms are always neutral in nature

b) Atoms are the basic units from which molecules and ions are formed

c) Atoms always combine to form molecules

d) Atoms aggregate in large numbers to form the matter that we can see, feel and touch