ECAT Pre Engineering Chemistry Chapter 1 MCQ Test With Answer

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 limiting reactant is one which according to the stoichiometric equation

Question # 2

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

Question # 3

A ring contains 3 gram diamond. The number of C-atoms which a ring contains is

Question # 4

The largest number of molecules are present in

Question # 5

NH3, HCL, H2O, HL are:

Question # 6

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

Question # 7

The phenomenon of isotropy was first discovered by

Question # 8

The mass of Al2S3formed when 20 grams Al reacts completely with S is

Question # 9

Isotopes differ in

Question # 10

He Ar and Ne are:

Question # 11

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

Question # 12

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

Question # 13

Al3+is a symbol for aluminium

Question # 14

Matter is defined as any thing which occupies space and:

Question # 15

Covalent compound s mostly exist in the form of:

Question # 16

How many moles of hydrogen atoms does 3.2 g of methane, CH4, contain?

Question # 17

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

Question # 18

CO+ is an example of

Question # 19

The negatively charged particles are called

Question # 20

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

Question # 21

Objects of the size of an atom can be observed in

Question # 22

First atomic theory was put forward by an English school teacher:

Question # 23

Hemoglobin contains nearly:

Question # 24

The number of moles of CO2which contain 8.0 g of oxygen

Question # 25

The number of atoms present in molecule determines its:

Question # 26

One mole of SO2contains

Question # 27

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

Question # 28

Where energy is released during a reaction it is

Question # 29

A molecule of haemoglobin is made up if nearly

Question # 30

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

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ECAT Chemistry Chapter 1 Important MCQ's

Sr.# Question Answer
1 The percentage of H is the highest in
A. CH4
B. NH3
C. H2SO4
D. C6H12O6
2 The percentage of which element in the organic compound is determined by the difference method
A. Carbon
B. Hydrogen
C. Nitrogen
D. Oxygen
3 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
4 The number of moles of CO2which contain 8.0 g of oxygen
A. 0.25
B. 0.50
C. 1.0
D. 1.50
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 Mass spectrometer measures the
A. Exact mass of an element
B. Average mass of an element
C. The number of elements present in a molecule
D. m/e value of a positive ion
7 A molecule of haemoglobin is made up if nearly
A. 10,000 atoms
B. 50,000 atoms
C. 2500 atoms
D. 1500 atoms
8 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
9 Atoms can be evident by use of electron microscope, field ionization microscope and:
A. x-rays
B. Video camera

C. Telescope
D. Compound microscope
10 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

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