set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

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 : 3

Which one of the following is a diagonally related pair?

a) Na, Mg

b) B, Si

c) H, Be

d) K, Ca

Question : 4

Which of the following properties generally decrease along a period?

a) Non-metallic character

b) Metallic character

c) Atomic size

d) Both (a) and (c)

Question : 5

The rusting of iron nail

a) increases its weight

b) does not affect weight but iron is oxidised

c) decreases its weight

d) does not affect weight but iron is reduced

Question : 6

Which of the following elements A, B, C, D and E with atomic number 3, 11, 15, 18 and 19 respectively belong to the same group?

a) B, C, D

b) A, D, E

c) A, B, C

d) A, B, E