ECAT Pre Engineering Chemistry Chapter 1 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 1 Basic Concepts

Try The MCQ's Test For ECAT Chemistry Chapter 1 Basic Concepts

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ECAT Chemistry Chapter 1 Basic Concepts

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Question # 1

Smallest particle of an element which may or may not have independent existence is known as:

Question # 2

CO+ is an example of

Question # 3

A compound having empirical formula C3H3O and its molecular mass is 110.02. Its molecular formula is

Question # 4

Isotopes differ in the

Question # 5

Which statement about an atom is true ?

Question # 6

A molecular ion is formed by

Question # 7

The largest number of molecules are present in

Question # 8

One mole of C2H5OH contains the number of H-atoms

Question # 9

Hemoglobin contains nearly:

Question # 10

Which one of the following step is not involved in determination of empirical formula

Question # 11

Hemoglobin is 68000 times heavier than:

Question # 12

Metal tend to lose electrons, becoming:

Question # 13

How many moles of oxygen, O2are needed for the complete combustion of two moles of butane C4H10?

Question # 14

A compound contains one atom of oxygen and % of O 34.78, then molecular mass of compound is

Question # 15

The number of subatomic particles in atoms sidcovered is more than:

Question # 16

A compound X contains 50% sulphur and 50% oxygen by mass. What is the empirical formula of compound X?

Question # 17

Which statement about molecule is incorrect ?

Question # 18

Which of the following compounds contains the highest percentage by mass of nitrogen?

Question # 19

The negatively charged particles are called

Question # 20

The value of R(General Gas Constant) is

Question # 21

The branch of science dealing with structure, composition and changes in matter and laws and principles which govern these changes is called as

Question # 22

The amount of products obtained from the balanced chemical equation is regarded as

Question # 23

One mole of SO2contains

Question # 24

A beaker contains 9 grams of water. The number of H-atoms is

Question # 25

The relative abundance of Pb isotopes is 1.5% Pb204, 23.6% Pb206, 22.6% Pb207, 52.3% Pb208The relative atomic mass of Pb is

Question # 26

The quantitative relationship between the substances according to balanced equation describes

Question # 27

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

Question # 28

3.01 x 1022Ag+ions is present in

Question # 29

If four moles of sulpur dioxide are oxidised to sulphur trioxide, how many moles of oxygen molecules are required

Question # 30

The isotopes of an element

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ECAT Chemistry Chapter 1 Important MCQ's

Sr.# Question Answer
1 The relative atomic mass of chlorine is 35.5. What is the mass of 2 mol of chlorine gas
A. 142 g
B. 71 g
C. 35.5 g
D. 18.75 g
2 Hemoglobin contains nearly:
A. 10,000 atoms
B. 100 atoms
C. 1000 atoms
D. 1 atom
3 The atom of an element is
A. The smallest particle
B. The fundamental particle
C. The independent particle
D. The charged particle
4 Which of the sub-atomic particles is not charged
A. Electron
B. Proton
C. Neutron
D. All of them
5 Ascorbic acid contains 40.92% carbon, 4.58%, hydrogen and 54.4% oxygen. The empirical formula is
A. C3H4O3
B. C2H4O3
C. C3H5O4
D. C2H3O1
6 Macromolecules are
A. organic molecules
B. High molecular mass molecules
C. Natural compounds
D. Rarely occurring molecules
7
Question Image
A. 99.2%
B. 99.5%
C. 90.5%
D. 96.2%
8 Matter is defined as any thing which occupies space and:
A. Molecules
B. Mass
C. Compound
D. Molecules
9 A compound X contains 50% sulphur and 50% oxygen by mass. What is the empirical formula of compound X?
A. SO
B. SO2
C. SO3
D. SO4
10 Isotopes differ in the
A. Number of neutrons
B. Number of protons
C. Number of electrons
D. Number of atoms

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