set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

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

a) Lother Meyer

b) Lavoisier

c) Mendeleev

d) Henry Moseley

Question : 2

Which is a metalloid?

a) Sb

b) Bi

c) Pb

d) Zn

Question : 3

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 : 4

Which of the following is correct set of Dobereiner Triads?

a) Be, Mg, Ca

b) F, Cl, I

c) Na, Si, Cl

d) Li, Na, Be

Question : 5

The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?

a) Metalloid

b) Non-metal

c) Metal

d) Left-hand side element

Question : 6

Which one of the following is most electropositive element?

a) Calcium

b) Aluminium

c) Sodium

d) Silicon