More Classes
5th Class
6th Class
7th Class
8th Class
9th Class
10th Class
11th Class
12th Class
NAT I
NAT II
CSS
IQ
General Knowledge
MDCAT
ECAT
GAT General
GAT Subject
Other Links
Go to Home
Online Tests
ECAT Chemistry Chapter 1 Basic Concepts Online Test MCQs With Answers
Question # 1
Choose an answer
300 cm
3
200 cm
3
150 cm
3
100 cm
3
Previous
Skip
Next
Question # 2
Mass spectrometer measures the
Choose an answer
Exact mass of an element
Average mass of an element
The number of elements present in a molecule
m/e value of a positive ion
Previous
Skip
Next
Question # 3
The atom of an element is
Choose an answer
The smallest particle
The fundamental particle
The independent particle
The charged particle
Previous
Skip
Next
Question # 4
Which of the following statements is not true?
Choose an answer
Isotopes with even atomic masses are comparatively abundant
Isotopes with even atomic masses are comparatively abundant
Isotopes with even atomic masses and even atomic numbers are comparatively abundant
Isotopes with even atomic masses and odd atomic number are comparatively abundant
Previous
Skip
Next
Question # 5
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
Previous
Skip
Next
Question # 6
Which one of the following step is not involved in determination of empirical formula
Choose an answer
Determination % of each element
Determination of gram atom of each element
Determination of isotopes of each element
Determination of atomic ratio of element
Previous
Skip
Next
Question # 7
A compound contains 75% carbon and 25% hydrogen, by mass. What is the molecular formula of the compound/
Choose an answer
C
3
H
8
CH
4
C
2
H
4
C
2
H
6
Previous
Skip
Next
Question # 8
The number of moles of CO2which contain 8.0 g of oxygen
Choose an answer
0.25
0.50
1.0
1.50
Previous
Skip
Next
Question # 9
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]
Previous
Skip
Next
Question # 10
The number of atoms present in molecule determines its:
Choose an answer
Molecularity
Atomicity
Basicity
Acidity
Previous
Skip
Next
Question # 11
The volume occupied by 1.4 g of N
2
at S.T.P is
Choose an answer
2.24 dm
3
22.4 dm
3
1.12 dm
3
112 cm
3
Previous
Skip
Next
Question # 12
CL
2
, N
2
and O
2 are:
Choose an answer
Diatomic molecules
Heter
o atomic molecules
Poly-atomic molecules
Mono-atomic molecules
Previous
Skip
Next
Question # 13
X-ray work has shown that the diameters of atom are of the order of
Choose an answer
8 x 10
-10
m
2 x 10
-10
m
8 x 10
-8
m
2 x 10
-8
m
Previous
Skip
Next
Question # 14
The percentage of which element in the organic compound is determined by the difference method
Choose an answer
Carbon
Hydrogen
Nitrogen
Oxygen
Previous
Skip
Next
Question # 15
Choose an answer
99.2%
99.5%
90.5%
96.2%
Previous
Skip
Next
Question # 16
A limiting reactant is the one which
Choose an answer
Is taken in lesser quantity in grams as compared to other reactants
Is taken in lesser quantity in volume as compared to other reactants
Gives the maximum amount of the product which is required
Gives the minimum amount of the product under consideration
Previous
Skip
Next
Question # 17
Two different hydrocarbon each contain the same percentage by mass of hydrogen. It follows that they have the same
Choose an answer
Empirical formula
Number of atoms in a molecules
Number of isomers
Relative molecular mass
Previous
Skip
Next
Question # 18
Determination of atomic masses and invention of system of writing symbols was made by:
Choose an answer
J. Berzelius
Democritus
Dalton
None of above
Previous
Skip
Next
Question # 19
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
Previous
Skip
Next
Question # 20
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
Previous
Skip
Next
Question # 21
Each molecule of haemoglobin is 68000 times heavier than one atom of
Choose an answer
C
H
N
O
Previous
Skip
Next
Question # 22
The empirical formula of a liquid compound is known to be C
2
H
4
O. What other information is needed to work out its molecular formula?
Choose an answer
The percentage composition of the compound
The relative molecular mass of the compound
The density of the compound
The volume occupied by one mole of the compound
Previous
Skip
Next
Question # 23
Who one mole of each of the following is completely burned in oxygen, which gives the largest mass of carbon dioxide?
Choose an answer
Carbon monoxide
Diamond
Ethane
Methane
Previous
Skip
Next
Question # 24
One mole of SO
2
contains
Choose an answer
6.02 x 10
23
atoms of oxygen
18.1 x 10
23
, molecules of SO
2
6.02 x 10
23
atoms of sulphur
4 gram atoms of SO
2
Previous
Skip
Next
Question # 25
The number of isotopes of gold is
Choose an answer
3
1
2
4
Previous
Skip
Next
Question # 26
Atoms can be evident by use of electron microscope, field ionization microscope and:
Choose an answer
x-rays
Video camera
Telescope
Compound microscope
Previous
Skip
Next
Question # 27
Choose an answer
32 g
3.2 g
5.6 g
9.6 g
Previous
Skip
Next
Question # 28
Choose an answer
N
2
O
4
is limiting reactant
N
2
H
4
is the limiting reactant
Reactants are completely converted to the products
Reactions is reversible
Previous
Skip
Next
Question # 29
Choose an answer
84.84 %
89.89%
81.81%
90.90%
Previous
Skip
Next
Question # 30
The quantitative relationship between the substances according to balanced equation describes
Choose an answer
Reversible reactions
Stoichiometry
Limiting reacting
Percentage composition
Previous
Skip
Next
Question # 31
The empirical formula of a compound is CH
2
O. What may be the compound
Choose an answer
C
2
H
5
OH
C
6
H
5
OH
HCOOH
Previous
Skip
Next
Back