classification of elements, chemical bonding, periodicity in properties & physical transformation - Category wise Question and Answer Practice Test with Solutions

Question : 6

The early attempt to classify elements as metals and nonmetals was made by

a) Lother Meyer

b) Lavoisier

c) Mendeleev

d) Henry Moseley

Question : 7

Which is a metalloid?

a) Sb

b) Bi

c) Pb

d) Zn

Question : 8

Amongst the following statements, which are correct?

1. The ceaseless zig-zag motion of sol particles is due to the unbalanced bombardment of particles by the molecules of dispersion medium
2. The intensity of zig-zag motion increases with the increase in the size of the particles
3. The zig-zag motion of particles becomes intense at high temperature
4. This motion has a stirring effect which does not permit the particles to settle

a) 1, 2 and 4

b) 1, 2 and 3

c) 1, 3 and 4

d) 2, 3 and 4

Question : 9

A radioactive element X emits an α-particle followed by 2 β-particles in the successive steps as :
X $⟶↖{λ_1} ↙{-α particle} Y ⟶↖{λ_2} ↙{-2β particles} Z$
Which of the following statement(s) is/are correct?

1. Y and Z are isotopes
2. The atomic number of X and Z are the same
3. Y and Z are isobars
4. The mass number of Y is greater than X

a) 1 and 4

b) 2 and 3

c) Only 1

d) Only 3

Question : 10

Elements of which group form anions most readily?

a) Nitrogen family

b) Halogens

c) Oxygen family

d) Alkali metals