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Free download in PDF CBSE class 9 Science Multiple Choice Questions(MCQs) with Answers. Here Gkseries provide Science Solve Questions and Answers for CBSE class 9 Students.
61
Which of the following is a heterogeneous mixture?
[A]
lime water
[B]
sugar dissolved in water
[C]
air
[D]
brass
62
Which of the following is NOT true about colloids?
[A]
A colloid is a homogeneous solution.
[B]
Colloidal particles exhibit electrophoresis.
[C]
Particles in a colloid can pass through filter paper.
[D]
Colloidal particles exhibit Brownian motion.
Answer: A colloid is a homogeneous solution.
63
Which of the following will have maximum mass?
[A]
0.1 mole of NH3
[B]
1022 atoms of Carbon
[C]
1022 molecules of CO2
[D]
1 gm of Fe
64
Which of the following is not correctly matched?
[A]
Copper - Co
[B]
Gold - Au
[C]
Calcium - Ca
[D]
Silver - Ag
65
A sample of ammonia molecule irrespective of source, contains 82.35% of Nitrogen and 17.65% of Hydrogen by mass. This data supports:
[A]
Law of Definite Proportions
[B]
Avagadro's Law
[C]
Law of Conservation of Mass
[D]
Las of Multiple Proportions
Answer: Law of Definite Proportions
66
The percentage of Hydrogen in H2O molecule is
[A]
11.11
[B]
88.89
[C]
5.55
[D]
44.45
67
Formula for Aluminium Oxide is:
[A]
Al2O3
[B]
Al3O2
[C]
AlO
[D]
none of these
68
1 u or 1 amu means
[A]
Mass of Hydrogen molecule
[B]
Mass of C-12 atom
[C]
1/12th mass of C-12 atoms
[D]
Mass of O-16 atom
Answer: 1/12th mass of C-12 atoms
69
The number of moles for 52g of He is:
(Atomic Mass of He: 4u)
[A]
6.022 × 1023
[B]
13
[C]
52
[D]
1
70
The number value 6.022 × 1023 is also called
[A]
Avagadro's number
[B]
Mass Number
[C]
Dalton Number
[D]
Atomic Number
Answer: Avagadro's number
71
Who introduced the term 'mole' in chemistry?
[A]
Wilhelm Ostwald
[B]
A Lavosier
[C]
John Dalton
[D]
Amedeo Avagadro
72
Law of Definite Proportions was proposed by:
[A]
Wilhelm Ostwald
[B]
John Dalton
[C]
Joseph Proust
[D]
None of these
73
Who laid the foundation of laws of Chemical Combination:
[A]
Lavoisier
[B]
Proust
[C]
Democritus
[D]
Dalton
74
Name the Indian Philospher who "the smallest indivisible particles of matter" as Parmanu
[A]
Democritus
[B]
Pakudha Katyayama
[C]
Maharishi Kanad
[D]
Aryabhatt
75
The maximum number of electrons that can be accommodated in M shell is:
[A]
18
[B]
19
[C]
5
[D]
7
76
Which one of the following will have the maximum charge/mass ratio?
[A]
α-particle
[B]
neutron
[C]
proton
[D]
electron
77
The number of electrons in the outermost shell in the atom of an inert element is
78
The electronic configuration of an atom is 2,8,3. The number of valence electrons in the atom is
[A]
3
[B]
8
[C]
10
[D]
13
79
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]
Z – A
[C]
A + Z
[D]
Z
80
Protium, Deutrium and Tritium are isotopes of ____________.
[A]
Hydrogen
[B]
Helium
[C]
Rhodium
[D]
Sodium
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