set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

The noble gases are unreactive because

a) they have a full outer shell of electrons

b) they have a half outer shell of neutrons

c) they react with sodium

d) they are too thin

Question : 2

Which of the following elements does not lose an electron easily?

a) F

b) Mg

c) Na

d) Al

Question : 3

Which of the following are correct statements?

1. The canonical structures have no real existence
2. Every $AB_5$ molecule does in fact have square pyramidal structure
3. Multiple bonds are always shorter than corresponding single bonds
4. The electron-deficient molecules can act as Lewis acids

a) 2, 3 and 4

b) 1, 2 and 3

c) 1, 3 and 4

d) 1, 2 and 4

Question : 4

To which block is related an element having electronic configuration 1s²  2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s¹ in the periodic table–

a) p–block

b) d–block

c) s–block

d) f–block

Question : 5

According to Newland’s law of octaves, which element is the repetition of the first element in the periodic table?

a) Nitrogen

b) Chlorine

c) Oxygen

d) Sulphur

Question : 6

The scientist who made maximum contribution towards periodic table was

a) Rutherford

b) Dalton

c) Chadwick

d) Mendeleev