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

When nitrogen is 5.6 grams in NO2. then number of moles of NO2is

Question # 2

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

Question # 3

The largest number of molecules are present in

Question # 4

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

Question # 5

A molecular ion is formed by

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

A limiting reactant is one which according to the stoichiometric equation

Question # 10

C6H12O6and C12H22O11 are:

Question # 11

Which has greater number of moles

Question # 12

The quantitative relationship between the substances according to balanced equation describes

Question # 13

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

Question # 14

Hemoglobin is 68000 times heavier than:

Question # 15

The number of moles of CO2which contain 8.0 g of oxygen

Question # 16

The atomic mass is measured in atomic mass unit (a.m.u.) which is equal to

Question # 17

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

Question # 18

Benzene is stable to:

Question # 19

A limiting reactant is the one which

Question # 20

The relative abundance of the ions with a definite m/e value is measured by

Question # 21

Macromolecules are

Question # 22

Which statement about molecule is incorrect ?

Question # 23

The number of atoms present in molecule determines its:

Question # 24

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

Question # 25

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

Question # 26

Which one of the following statements is not correct

Question # 27

Which of the sub-atomic particles is not charged

Question # 28

Isotopes of an element differ in

Question # 29

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

Question # 30

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

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ECAT Chemistry Chapter 1 Important MCQ's

Sr.# Question Answer
1 The mass of Al2S3formed when 20 grams Al reacts completely with S is
A. 60 g
B. 50 g
C. 50.55 g
D. 55.55 g
2 Matter is defined as any thing which occupies space and:
A. Molecules
B. Mass
C. Compound
D. Molecules
3 The atom of an element is
A. The smallest particle
B. The fundamental particle
C. The independent particle
D. The charged particle
4 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
5 Al3+is a symbol for aluminium
A. Atom
B. Ion
C. Cation
D. Anion
6 The number of atoms present in molecule determines its:
A. Molecularity
B. Atomicity
C. Basicity
D. Acidity
7 Atoms can be evident by use of electron microscope, field ionization microscope and:
A. x-rays
B. Video camera

C. Telescope
D. Compound microscope
8 Two different hydrocarbon each contain the same percentage by mass of hydrogen. It follows that they have the same
A. Empirical formula
B. Number of atoms in a molecules
C. Number of isomers
D. Relative molecular mass
9 The atomic mass is measured in atomic mass unit (a.m.u.) which is equal to
A. 1.661 x 10-27- Kg
B. 1.661 x 10-24Kg
C. 1.661 x 10-27- g
D. 1.661 x 10-24mg
10 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

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