Periodic Classification of Elements UPSC Questions

Chemistry

Periodic Classification of Elements MCQ Questions


7.

Identify the TRUE statements from the following
a) John Newlands arranged the known elements in the order of increasing atomic masses.
b) He started with the element having the lowest atomic mass (hydrogen) and ended at thorium which was the 56th element.
c) He found that every eighth element had properties similar to that of the first.
d) He compared this to the octaves found in music. Therefore, he called it the ‘Law of Octaves’

A.

Only d

B.

Both a and b

C.

All a,b,c,d

D.

Only b

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ANSWER :

C. All a,b,c,d

8.
In Newlands' Octaves, what were the two elements where their properties found to be the same?
A.
Sodium and Potassium
B.
Lithium and Sodium
C.
Argon and Neon
D.
Oxygen and Boron
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ANSWER :
B. Lithium and Sodium
9.
It was found that the Law of Octaves was applicable only up to _____ as after that every eighth element did not possess properties similar to that of the first.
A.
Calcium
B.
Lithium
C.
Carbon
D.
Hydrogen
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ANSWER :
A. Calcium
10.
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
11.
With the discovery of _____, the Law of Octaves became irrelevant
A.
Solutions
B.
Metalloids
C.
Noble gases
D.
Metals
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ANSWER :
C. Noble gases
12.
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