Periodic Classification of Elements UPSC Questions

Chemistry

Periodic Classification of Elements MCQ Questions


7.
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
8.
Match the following Elements Symbols (a) Potassium - (1) K (b) Gold - (2) Au (c) Aluminum - (3) Al (d) Magnesiun - (4) Mg
A.
a-1,b-2,b-3,d-4
B.
a-4,b-3,c-2,d-1
C.
a-2,b-1,c-3,d-4
D.
a-3,b-2,c-1,d-4
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ANSWER :
A. a-1,b-2,b-3,d-4
9.
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
10.
The property of metals by which they can be beaten into thin sheets is called
A.
Permeability
B.
Malleability
C.
Permitivity
D.
Ductility
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ANSWER :
B. Malleability
11.

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

12.
The property of metal by which it can be drawn into wires is called
A.
Ductility
B.
Permeability
C.
Malleability
D.
Permitivity
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ANSWER :
A. Ductility