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Online Tests
ECAT Chemistry Chapter 1 Basic Concepts Online Test MCQs With Answers
Question # 1
Which of the following statement is correct for a chemical reaction to occur molecules of substances must
Choose an answer
Collide with each other
Collide with energy more than activation energy
Collide with energy less than activation energy
Collide with high frequency
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Question # 2
One mole of C
2
H
5
OH contains the number of H-atoms
Choose an answer
6.02 x 10
23
3.61 x 10
24
1.81 x 10
24
6.02 x 10
24
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Question # 3
The largest number of molecules are present in
Choose an answer
3.6 g of H
2
O
4.8 g of C
2
H
5
OH
2.8 g of CO
5.4 g of N
2
O
5
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Question # 4
The number of moles of CO2which contain 8.0 g of oxygen
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0.25
0.50
1.0
1.50
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Question # 5
The mass of one mole of proton is
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1.008 g
0.184 g
1.673 g
1.008 mg
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Question # 6
Who one mole of each of the following is completely burned in oxygen, which gives the largest mass of carbon dioxide?
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Carbon monoxide
Diamond
Ethane
Methane
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Question # 7
Which has greater number of moles
Choose an answer
0.1 g sodium
6.02 x 10
20
atoms of magnesium
20 cm
3
0.1
mole per dm
3
of NaOH
12.2 dm
3
of nitrogen at standard
[A
r
Na = 23, Mg = 24, O = 16]
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Question # 8
Choose an answer
8 g
16 g
32 g
24 g
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Question # 9
When an electron is added to a uni positive ion we get:
Choose an answer
Cation
Molecule
Neutral atom
Anion
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Question # 10
CL
2
, N
2
and O
2 are:
Choose an answer
Diatomic molecules
Heter
o atomic molecules
Poly-atomic molecules
Mono-atomic molecules
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Question # 11
Isotopes differ in the
Choose an answer
Number of neutrons
Number of protons
Number of electrons
Number of atoms
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Question # 12
Smallest particle of an element which may or may not have independent existence is known as:
Choose an answer
A molecule
An ion
An atom
An electron
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Question # 13
A balloon contains 0.02 gram of H
2
gas, it contains H
2
molecules
Choose an answer
6.02 x 10
23
3.01 x 10
22
6.02 x 10
21
3.01 x 10
21
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Question # 14
Which statement about an atom is true ?
Choose an answer
The number of neutrons is not equal to number of electrons
Mass number is less than atomic number
All the elements have only one mass number
Mass number can be equal to atomic number
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Question # 15
Determination of atomic masses and invention of system of writing symbols was made by:
Choose an answer
J. Berzelius
Democritus
Dalton
None of above
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Question # 16
C
6
H
12
O
6
and C
12
H
22
O
11
are:
Choose an answer
Mono-atomic molecules
Diatomic molecules
Poly-atomic molecules
Heter
o atomic molecules
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Question # 17
Al
3+
is a symbol for aluminium
Choose an answer
Atom
Ion
Cation
Anion
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Question # 18
When 0.1 g of magnesium is treated with an excess of hydrochloric acid, what volume of gas at room temperature and pressure will be produced
Choose an answer
10 cm
3
25 cm
3
48 cm
3
100 cm
3
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Question # 19
Choose an answer
84.84 %
89.89%
81.81%
90.90%
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Question # 20
The phenomenon of isotropy was first discovered by
Choose an answer
Soddy
Rutherford
Bohr
Dalton
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