Periodic Classification of Elements MCQ

Periodic Classification of Elements MCQ

1-Matter around us is present in the form of

(A) elements

(B) compounds

(C) mixtures

(D) all of the above

 

2-At present ___ elements are known to us.

(A) 115

(B) 116

(C) 117

(D) 118

 

3-Number of elements those are naturally occurring.

(A) 92

(B) 93

(C) 94

(D) 95

 

4- Dobereiner could identify only ___ triads from the elements known at that time

(A) three

(B) four

(C) five

(D) six

 

5- It was assumed by Newlands that only ___ elements existed in nature and no more elements would be discovered in the future.

(A) 36

(B) 46

(C) 56

(D) 66

 

6-Mendeleev was a ___ chemist.

(A) American

(B) English

(C) French

(D) Russian

 

7- Periodic Law states that ‘the properties of elements are the periodic function of their ___ ’.

(A) atomic masses

(B) structures

(C) atomic weights

(D) all of the above

 

8-Mendeléev’s Periodic Table contains vertical columns called

(A) groups

(B) periods

(C) intervals

(D) none of the above

 

9-Following is (are) the noble gas(es).

(A) Helium

(B) Neon

(C) Argon

(D) All of the above

 

10- Mendeleev could not assign a correct position to ___ . This was the first limitation.

(A) Oxygen

(B) Carbon

(C) Hydrogen

(D) Calcium

 

ANSWERS:

1-(D), 2-(D), 3-(C), 4-(A), 5-(C), 6-(D), 7-(A), 8-(A), 9-(D), 10-(C)