1.
Which of the following provides an example of a true solution?
A) Blood
B) Milk
C) Starch solution
D) Sugar solution
2.
Which of the following can be classified as a pure substance?
A) Milk
B) Sea - water
C) Ice
D) Cast iron
3.
Which of the following is a compound?
A) air
B) Milk
C) Iodine
D) Water
4.
Which of the following is NOT true about colloids?
A) Particles in a colloid can pass
through filter paper.
B) A colloid is a homogeneous
solution.
C) Colloidal particles exhibit
Brownian motion.
D) Colloidal particles exhibit
electrophoresis
5.
Which of the following is a heterogeneous mixture?
A) Air
B) brass
C) sugar dissolved in water
D) lime water
6.
How can we separate cream from milk?
A) Centrifugation
B) Chromatography
C) Sublimation
D) Distillation
7.
Removal of clear layer of the liquid without disturbing the settled solid is
known as __________.
A) Sedimentation
B) Decantation
C) Filtration
D) Evaporation
8.
A mixture of water and silver chloride can be separated by
A) Centrifugation
B) Sedimentation
C) Filtration
D) Sublimation
9.
When two liquids in a mixture differ by their boiling points, which of the
following is the best method to separate these liquids?
A) Evaporation
B) Distillation
C) Chromatography
D) Filtration
10.
Solution which has uniform composition throughout is called ___________.
A) homogeneous solution
B) heterogeneous solution
C) Colloidal solution
D) none of these
11.
The particles of a suspension will be of size ________
A) less than 1nm (nm = nano metre)
B) between 1nm to 100 nm
C) greater than 100nm
D) less than 0.1 nm
12.
Which of the following is a chemical change?
A) Melting of ice
B) Dissolving salt in water
C) Rusting of iron
D) Boiling of water into steam
13.
Which one of the following is TRUE for
compounds?
A) It shows properties of its
constituents.
B) It may be homogeneous or
heterogeneous.
C) It can be separated by physical
methods.
D) It has fixed melting and boiling
point.
14.
In water, hydrogen and oxygen are present in the ratio of ________.
A) 1:8
B) 2:12
C) 2:3
D) 1:2
15.
An example of a triatomic molecule is ___________.
A) Ozone
B) Nitrogen
C) Carbon monoxide
D) Hydrogen
16.
The quantity of matter present in an object is called its _________.
A) Mass
B) Volume
C) Density
D) Vapour pressure
17.
Indivisibility of an atom was proposed by ___________.
A) Dalton
B) Rutherford
C) Thomson
D) Bohr
18.The
value of Avogadro constant is ___________.
A) 6.022 x 1024
B) 6.022 x 1022
C) 60.22 x 1023
D) 6.022 x 1023
19.
All samples of carbon dioxide contain carbon and oxygen in the mass ratio of
3:8. This is in agreement with the Law of ___________.
A) Conservation of Mass
B) Constant Proportion
C) Multiple Proportion
D) Reciprocal Proportion
20.
The atomic mass of sodium is 23. The number of moles in 46g of sodium is
________.
A) 2
B) 1
C) 4
D) 0
21.
The molecular formula of potassium nitrate is ________.
A) KNO
B) KNO3
C) KNO2
D) KON
22. Kalium is the Latin name of ________.
A) Potassium
B) Krypton
C) Calcium
D) Phosphorus
23. The smallest particle of a substance that is
capable of independent existence is _________.
A) Atom
B) Molecule
C) Electron
D) Proton
24. The molecular mass of ammonia is _________.
A) 17 grams
B) 31 grams
C) 20 grams
D) 25 grams
25.
Atomic mass of calcium is 40. The mass of 2.5 gram atoms of calcium is _______.
A)
40
g
B)
2.5
g
C)
100
g
D)
80
g
26.
The number of atoms in a molecule of the
elementary substance is called ________.
A)
Atomic
number
B)
Avogadro
number
C)
Atomic
mass
D)
Atomicity
27. Avogadro number represents the number of
atoms in ________.
A)
12
grams of 12C
B)
320
grams of sulphur
C)
32
grams of oxygen
D)
1
gram of 12C
28.
The number of moles in 5 grams of calcium is _________.
A) 0.125 mole
B) 5 mole
C) 1.25 mole
D) 12.5 moles
29. 2 molecules of nitrogen are represented by
________.
A)
N
B)
2N2
C)
N2
D)
2N
30. Select the ionic compound -
A) Sulphur molecule, S8
B) Phosphorous molecule, P4
C) Methane, CH4
D) Copper nitrate, Cu(NO3)2
31.
Which of the following does not change when a chemical reaction takes place?
A) volume
B) mass
C) physical properties
D) chemical properties
32.
One atomic mass unit is equal to weight of -
A) one atom of hydrogen
B) 1/16th of oxygen atom
C) 1/12th of natural carbon atom
D) 1/12th of C-12 isotope of carbon.
33. Which one of the following is not equal to
gram molecular mass of hydrogen -
A) 2 gm
B) 6.022 x 1023 atoms of
hydrogen
C) 6.022 x 1023 molecules
of hydrogen
D) 1 mole of hydrogen
34. Proton was discovered by:
A) Rutherford
B) Goldstein
C) Chadwick
D) J.J. Thomson
35. Canal rays are _______________
A)
negative
charged particles
B)
positive
charged particles
C)
beam
of neutrons
D)
gamma
radiation
36. α-particles are ___________
A)
negative
charged particles
B)
positive
charged particles
C)
beam
of neutrons
D)
gamma
radiation
37. An α-particle is _____________
A)
a
Hydrogen nucleus
B)
a
Helium nucleus
C)
a
proton
D)
an
electron
38. Rutherford's gold foil experiment showed that
most of the α-particles passed through the gold foil without any deflection. It
indicates that
A)
the
nucleus is concentrated at the centre
B)
the
nucleus carries positive charge
C)
there
is lot of empty space in atom
D)
the
nucleus carries the most of the mass
39. Two elements X and Y have the same atomic
mass but their atomic numbers are 20 and 21 respectively. X and Y are:
A)
isobars
B)
isotones
C)
isomers
D)
isotopes
40. In an atom, the mass number of an atom is
equal to the number of _________________.
A)
nucleons
B)
protons
C)
electrons
D)
neutrons
41. Number of neutrons present in Hydrogen atom
is _______.
A)
0
B)
1
C)
2
D)
3
42. Protium, Deutrium and Tritium are isotopes of
____________.
A)
Rhodium
B)
Sodium
C)
Hydrogen
D)
Helium
43. If Z represents the atomic number and A
represents mass number, then the number of neutrons in an atom can be computed
as
A)
A
+ Z
B)
A
– Z
C)
Z
– A
D)
Z
44. The electronic configuration of an atom is
2,8,3. The number of valence electrons in the atom is
A)
13
B)
10
C)
3
D)
8
45. The number of electrons in the outermost
shell in the atom of an inert element is
A)
0
B)
1
C)
2
D)
8
46. Which one of the following will have the
maximum charge/mass ratio?
A)
electron
B)
proton
C)
neutron
D)
α-particle
47. The maximum number of electrons that can be
accommodated in M shell is:
A)
2
B)
8
C)
18
D)
32
48.
What is an electron?
A) A wave
B) A particle
C) Either of two, depending on how
it is observed
D) Neither of these
49. The atomic number of an element is 11 and its
mass number is 23. The correct order representing the number of electrons,
protons and neutrons respectively in this atom is:
A) 11, 11, 12
B) 11, 12, 11
C) 12, 11, 11
D) 23, 11, 23
50.
The maximum number of electrons that can be accommodated in third shell ( n =
3) is:
A) 2
B) 8
C) 18
10