Periodic Classification of Elements UPSC Questions

Chemistry

Periodic Classification of Elements MCQ Questions


1.
How many elements are there on the periodic table?
A.
120
B.
118
C.
100
D.
98
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ANSWER :
B. 118
2.
Among the elements on the periodic table, how many elements are naturally occurring?
A.
94
B.
10
C.
105
D.
87
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ANSWER :
A. 94
3.
The earliest attempt to classify the elements resulted in grouping the then known elements as
A.
Natural and man-made
B.
Chemical and physical
C.
Metals and non-metals
D.
None of these
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ANSWER :
C. Metals and non-metals
4.
Johann Wolfgang Döbereiner identified some grouped having three elements each. So he called these groups as _____
A.
Penta
B.
Tetra
C.
Triplets
D.
Triads
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ANSWER :
D. Triads
5.
When the three elements in a triad were written in the order of increasing atomic masses, the atomic mass of the middle element was roughly the _____ of the atomic masses of the other two elements
A.
Product
B.
Average
C.
Difference
D.
Sum
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ANSWER :
B. Average
6.

Which of the following are the Döbereiner triads?
a) Ca,Sr,Ba
b) Cl,Br,I
c) N,P,As

A.

Both a and b

B.

Only c

C.

Only a

D.

Only b

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ANSWER :

A. Both a and b