Periodic Classification of Elements UPSC Questions

Chemistry

Periodic Classification of Elements MCQ Questions


13.
"The properties of elements are the periodic function of their atomic masses" This was on the basis of Mendeléev's _____
A.
Table law
B.
Periodic law
C.
Configurative law
D.
Mass law
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ANSWER :
B. Periodic law
14.
Mendeléev’s Periodic Table contains vertical columns called _____
A.
Atomicity
B.
Mass number
C.
Groups
D.
Periods
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ANSWER :
C. Groups
15.
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
16.
Electronic configuration of _____ resembles that of alkali metals.
A.
Hydrogen
B.
Helium
C.
Lithium
D.
Carbon
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ANSWER :
A. Hydrogen
17.
Just like halogens, hydrogen also exists as _____ molecules and it combines with metals and non-metals to form covalent compounds.
A.
Triatomic
B.
Diatomic
C.
Monoatomic
D.
None of these
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ANSWER :
B. Diatomic
18.

Statement 1: Certainly, no fixed position can be given to hydrogen in the Periodic Table.
Statement 2: This was the first limitation of Mendeléev’s Periodic Table. He could not assign a correct position to hydrogen in his Table.

A.

Statement 1 is true, Statement 2 is true. Statement 2 doesn't explain Statement 1

B.

Statement 1 is true, Statement 2 is true. Statement 2 explains Statement 1

C.

Statement 1 is false, Statement 2 is true.

D.

Statement 1 is true, Statement 2 is false

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ANSWER :

B. Statement 1 is true, Statement 2 is true. Statement 2 explains Statement 1