Classification of Elements and Periodicity in Properties NDA Questions

NDA Chemistry

Classification of Elements and Periodicity in Properties MCQ Questions


1.
In Mendeléev's Periodic Table, the elements were arranged on the basis of their fundamental property, _____ and also on the similarity of chemical properties.
A.
Atomic mass
B.
Mass number
C.
Physical properties
D.
Durability
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ANSWER :
A. Atomic mass
2.
Mendeléev’s Periodic Table contains horizontal rows called _____
A.
Physical properties
B.
Wave number
C.
Groups
D.
Periods
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ANSWER :
D. Periods
3.
According to Newlands, how many elements were existed in nature?
A.
115
B.
100
C.
94
D.
56
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ANSWER :
D. 56
4.
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
5.
Electronic configuration of _____ resembles that of alkali metals.
A.
Hydrogen
B.
Helium
C.
Lithium
D.
Carbon
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ANSWER :
A. Hydrogen
6.
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