Elements and Compounds TNPSC Group 2 2A Questions

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
ANSWER :
A. atomic number
8.
The element used in lead pencils is
A.
carbon
B.
zinc
C.
lead
D.
tin
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
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
ANSWER :
C. Mendeleef
11.
Which is neither an element nor a compound?
A.
gold
B.
water
C.
air
D.
glucose
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
ANSWER :
B. 2