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

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

Question # 2

3.01 x 1022Ag+ions is present in

Question # 3

Two different hydrocarbon each contain the same percentage by mass of hydrogen. It follows that they have the same

Question # 4

X-ray work has shown that the diameters of atom are of the order of

Question # 5

A molecular ion is formed by

Question # 6

The number of atoms present in molecule determines its:

Question # 7

1.12 dm3of N2gas at S.T.P. has mass of N2gas

Question # 8

Metal tend to lose electrons, becoming:

Question # 9

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

Question # 10

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

Question # 11

The atom of an element is

Question # 12

Hemoglobin contains nearly:

Question # 13

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

Question # 14

CO+ is an example of

Question # 15

Who one mole of each of the following is completely burned in oxygen, which gives the largest mass of carbon dioxide?

Question # 16

One mole of C2H5OH contains the number of H-atoms

Question # 17

Which of the following statements is not true?

Question # 18

A molecule of haemoglobin is made up if nearly

Question # 19

The number of moles of CO2which contain 8.0 g of oxygen

Question # 20

Atoms can be evident by use of electron microscope, field ionization microscope and:

Question # 21

The largest number of molecules are present in

Question # 22

The empirical formula of a liquid compound is known to be C2H4O. What other information is needed to work out its molecular formula?

Question # 23

A limiting reactant is the one which

Question # 24

Objects of the size of an atom can be observed in

Question # 25

Macromolecules are

Question # 26

The wave length of visible light is 500 nm. In S.I. unit this value is

Question # 27

The empirical formula of a compound is CH2O. What may be the compound

Question # 28

The number of isotopes of gold is

Question # 29

Mass spectrometer measures the

Question # 30

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

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ECAT Chemistry Chapter 1 Important MCQ's

Sr.# Question Answer
1 How many moles of oxygen, O2are needed for the complete combustion of two moles of butane C4H10?
A. 2
B. 8
C. 10
D. 13
2 Which of the sub-atomic particles is not charged
A. Electron
B. Proton
C. Neutron
D. All of them
3 Which of the following statements is not true?
A. Isotopes with even atomic masses are comparatively abundant
B. Isotopes with even atomic masses are comparatively abundant
C. Isotopes with even atomic masses and even atomic numbers are comparatively abundant
D. Isotopes with even atomic masses and odd atomic number are comparatively abundant
4 A molecular ion is formed by
A. Passing a high energy electron beam through gaseous molecule
B. Dissolving a salt i dilute acid
C. Passing electric current through molten salt
D. Passing electricity through aqueous solutions
5 Relative atomic mass of an element is the mass of the element relative to
A. 1/12 mass of carbon-12
B. 1/12 mass of carbon
C. 1 mass of hydrogen atom
D. 1/16 mass of oxygen
6 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
7 Each molecule of haemoglobin is 68000 times heavier than one atom of
A. C
B. H
C. N
D. O
8 The largest number of molecules are present in
A. 3.6 g of H2O
B. 4.8 g of C2H5OH
C. 2.8 g of CO
D. 5.4 g of N2O5
9 Which of the following statement is correct for a chemical reaction to occur molecules of substances must
A. Collide with each other
B. Collide with energy more than activation energy
C. Collide with energy less than activation energy
D. Collide with high frequency
10 Atoms can be evident by use of electron microscope, field ionization microscope and:
A. x-rays
B. Video camera

C. Telescope
D. Compound microscope

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