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Elements and Compounds TNPSC Group 1 Questions
TNPSC Group 1 SYLLABUS
Chemistry
Elements and Compounds
Acids, Base and Salts
Petroleum Products
Fertilizers and Pesticides
Elements and Compounds MCQ Questions
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7.
In the modern periodic table, elements are classified on the basis of
A.
atomic number
B.
atomic weight
C.
valency
D.
atomic size
😑
View Answer
Rough Work
Error
ANSWER
:
A. atomic number
8.
The element used in lead pencils is
A.
carbon
B.
zinc
C.
lead
D.
tin
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Rough Work
Error
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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Rough Work
Error
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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Error
ANSWER
:
C. Mendeleef
11.
Which is neither an element nor a compound?
A.
gold
B.
water
C.
air
D.
glucose
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Rough Work
Error
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
😑
View Answer
Rough Work
Error
ANSWER
:
B. 2
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