Chemistry
IX
MCQs [Chapter# 02]
i.
“Mass
can neither be created nor be destroyed but it can be converted into one form
to another form”. It is:
a.
Law of conservation of mass
b.
Law
of constant composition
c.
Law
of reciprocal proportion
d.
Law
of multiple proportion
ii.
“When
two different elements separately combine to the fix mass of the third element,
the proportion in which they combined with one another shall be either in the
same ratio or simple multiple of it.” It is:
a.
Law
of conservation of mass
b.
Law
of constant composition
c.
Law of reciprocal proportion
d.
Law
of multiple proportion
iii.
“Different
samples of the same compound always contain the same elements combined together
in the same proportions by mass.” It is:
a.
Law
of conservation of mass
b.
Law of constant composition
c.
Law
of reciprocal proportion
d.
Law
of multiple proportion
iv.
“If two
elements combined to form more than one compound the mass of the one element
that combine with the fixed mass of the other element are in a ratio of small
whole numbers or simple multiple of it.” It is:
a.
Law
of conservation of mass
b.
Law
of constant composition
c.
Law
of reciprocal proportion
d.
Law of multiple proportion
v.
Reaction in which two or more substances join
together to form one compound is:
a.
Addition
reaction
b.
Combination
reaction
c.
Synthesis
reaction
d.
All of the above
vi.
Reaction in which a compound breaks into two or
more substances is:
a.
Addition
reaction
b.
Decomposition
reaction
c.
Single
displacement reaction
d.
All of the above
vii.
In any balanced chemical reaction:
a.
Number of reactant and product should be same
b.
Number
of reactant should be greater than product
c.
Number
of reactant should be lesser than product
d.
Depend
on type of reaction
viii.
The atomic mass of oxygen is:
a.
8
amu
b.
12
amu
c.
16 amu
d.
20
amu
ix.
Mass number is denoted by:
a.
A
b.
M
c.
N
d.
Z
x.
The molecular formula of benzene is C6H6,
its empirical formula should be:
a.
CH
b.
C2H2
c.
C3H3
d.
C4H4
xi.
The sum
of all atoms present in a formula unit of the substance is:
a.
Molar
mass
b.
Formula
mass
c.
Molecular
mass
d.
Atomic
mass
xii.
1 mole
of CO2 =
a.
6.02X1020 atoms
b.
6.02X1021 atoms
c.
6.02X1022 atoms
d.
6.02X1023
atoms
xiii.
If sodium has atomic mass 23 and its atomic number
is 11, total neutron should be:
a.
10
b.
11
c.
12
d.
13
xiv.
What is the atomic number of element 12Mg24?
a.
6
b.
12
c.
18
d.
24
xv.
What is the mass number of 17Cl35?
a.
17
b.
35
c.
18
d.
None
of these
xvi.
Total number of proton in 20Ca40:
a.
20
b.
40
c.
60
d.
0
xvii.
Molar
mass of the substance is the relative mass expressed in:
a.
gm
b.
amu
c.
Kg
d.
All of the above
