Periodic Classification of Elements UPSC Questions

Physics

Periodic Classification of Elements MCQ Questions


13.
How many periods and groups are present in the periodic classification of elements
A.
7 Periods and 18 Groups
B.
8 Period and 17 Groups
C.
7 Periods and 17 Groups
D.
8 Periods and 18 Groups
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ANSWER :
A. 7 Periods and 18 Groups
14.
Which of the following about non-metals is correct (i) Non-Metals are soft except diamond (ii)They are shiny (iii) They are brittle and can break down into pieces (iv) They are electropositive in nature
A.
(i) and (ii) only
B.
(i) and (iii) only
C.
(ii) and (iii) only
D.
(i), (ii) and (iii) only
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ANSWER :
B. (i) and (iii) only
15.
You can consider a mineral to be an ore if metal
A.
Can be extracted from it profitably
B.
can be produced from it
C.
can't produced from it
D.
is very costly
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ANSWER :
A. Can be extracted from it profitably
16.
At present, there are ___ elements in that only ___ are naturally occuring
A.
117,94
B.
118,94
C.
117,95
D.
118,95
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ANSWER :
B. 118,94
17.
The law of octaves was found applicable for which element
A.
Calcium
B.
Cobalt
C.
Copper
D.
Oxygen
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ANSWER :
A. Calcium
18.
In metallurgy, the earthy impurities that are associated with minerals are called
A.
Flux
B.
Gangue
C.
Ore
D.
Slag
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ANSWER :
B. Gangue