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

Question : 1

On moving horizontally across a period, the number of electrons in the outermost shell increases from ...... to ....... .

a) 2, 18

b) 1, 8

c) 2, 8

d) 1, 18

Question : 2

Which one of the following is most electropositive element?

a) Calcium

b) Aluminium

c) Sodium

d) Silicon

Question : 3

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 : 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 [CDS]

A woman desires to clean the surface of her gold ornaments by a chemical approach. For this she requires to use

a) concentrated H₂SO₄

b) concentrated NaOH

c) aqua-regia

d) sodium thiosulphate solution