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

Question : 16

The long form of periodic table consists of

a) seven periods and eighteen groups

b) eight periods and eighteen groups

c) seven periods and eight groups

d) eighteen periods and eight groups

Question : 17 [NDA]

In the KMnO₄ molecule, the oxidation states of the elements Potassium (K), Manganese (Mn) and Oxygen (O) are respectively

a) +1, +7, – 2

b) 0, 0, 0

c) +1, +5, – 2

d) +1, +7, 0

Question : 18

Which one of the following is a diagonally related pair?

a) Na, Mg

b) B, Si

c) H, Be

d) K, Ca

Question : 19

If the valene shell electronic configuration for an element is $ns^2np^5$, this element will belong to the group of –

a) inert metals

b) noble gases

c) alkali metals

d) halogens

Question : 20

Which of the following group of elements belongs to alkali metals?

a) 37, 19, 3, 55

b) 9, 17, 35, 53

c) 1, 12, 30, 4, 62

d) 12, 20, 56, 88