Elements and Compounds TNPSC Group 1 Questions

Chemistry

Elements and Compounds MCQ Questions

7.
In the modern periodic table, elements are classified on the basis of
A.
atomic number
B.
atomic weight
C.
valency
D.
atomic size
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ANSWER :
A. atomic number
8.
The element used in lead pencils is
A.
carbon
B.
zinc
C.
lead
D.
tin
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ANSWER :
A. carbon
9.
Mass number of an element represents
A.
Number of protons and neutrons
B.
Number of electrons
C.
Number of protons and electrons
D.
None of these
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ANSWER :
A. Number of protons and neutrons
10.
"The properties of elements are periodic function of their atomic weights" This statement was given by
A.
Bohr
B.
Doberiner
C.
Mendeleef
D.
Lother-Mayer
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ANSWER :
C. Mendeleef
11.
Which is neither an element nor a compound?
A.
gold
B.
water
C.
air
D.
glucose
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ANSWER :
C. air
12.
An element has atomic weight 24 and equivalent weight 11.9. Its valency is
A.
1
B.
2
C.
3
D.
4
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ANSWER :
B. 2