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

The diameter of atoms is of the order:

Question # 2

What is the maximum mass of aluminium which can be obtained from 240g of aluminium oxide Al2O3?

Question # 3

Which statement about molecule is incorrect ?

Question # 4

Which of the following statements is not true?

Question # 5

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

Question # 6

A compound contains 75% carbon and 25% hydrogen, by mass. What is the molecular formula of the compound/

Question # 7

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

Question # 8

Where energy is released during a reaction it is

Question # 9

Determination of atomic masses and invention of system of writing symbols was made by:

Question # 10

The pressure of vapours when sent to the ionization chamber in mass spectrometer is

Question # 11

Macromolecules are

Question # 12

Isotopes differ in the

Question # 13

Ascorbic acid contains 40.92% carbon, 4.58%, hydrogen and 54.4% oxygen. The empirical formula is

Question # 14

One of the following statements is incorrect

Question # 15

The percentage of which element in the organic compound is determined by the difference method

Question # 16

The negatively charged particles are called

Question # 17

The volume occupied by 1.4 g of N2 at S.T.P is

Question # 18

What is the volume in cm3of 3.01 x 1023molecules of O2gas at S.T.P

Question # 19

Hemoglobin contains nearly:

Question # 20

The mass of one mole of proton is

Question # 21

0.5 mole of CH4and 0.5 mole of SO2gases have equal

Question # 22

A species having positive or negative charge is called:

Question # 23

One mole of ethanol and one mole of ethane have an equal

Question # 24

Isotopes of an element differ in

Question # 25

Which one of the following compounds does not have the empirical formula CH2O?

Question # 26

Which statement about an atom is true ?

Question # 27

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

Question # 28

Formation of a cation is:

Question # 29

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

Question # 30

Metal tend to lose electrons, becoming:

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ECAT Chemistry Chapter 1 Important MCQ's

Sr.# Question Answer
1 One mole of C2H5OH contains the number of H-atoms
A. 6.02 x 1023
B. 3.61 x 1024
C. 1.81 x 1024
D. 6.02 x 1024
2 The number of isotopes of gold is
A. 3
B. 1
C. 2
D. 4
3 The relative abundance of the ions with a definite m/e value is measured by
A. High pressure of vapours
B. Strength of electric current measured
C. Quantity of fast moving electrons
D. Electron gas
4 First atomic theory was put forward by an English school teacher:
A. Maxewell
B. Newton
C. Sanger
D. John Dalton
5 Isotopes of an element differ in
A. Number of protons
B. Number of electrons
C. Number of neutrons
D. Number of electrons and protons
6 Which one of the following step is not involved in determination of empirical formula
A. Determination % of each element
B. Determination of gram atom of each element
C. Determination of isotopes of each element
D. Determination of atomic ratio of element
7 A beaker contains 9 grams of water. The number of H-atoms is
A. 6.02 x 1023
B. 3.01 x 1023
C. 6.02 x 1024
D. 3.01 x 1024
8 A balloon contains 0.02 gram of H2gas, it contains H2molecules
A. 6.02 x 1023
B. 3.01 x 1022
C. 6.02 x 1021
D. 3.01 x 1021
9 Atoms and molecules can either gain or lose electrons, forming charge particles called:
A.

Positrons

B.

Photons

C.

Ions

D.

Electrons
10 Objects of the size of an atom can be observed in
A. An electron microscope
B. An x-ray spectrum
C. Atomic absorption spectrum
D. A visible spectrum

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