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

Molecules of High molecular weight usually greater than 10,000 are called:

Question # 2

Benzene is stable to:

Question # 3

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

Question # 4

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

Question # 5

The isotopes of an element

Question # 6

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

Question # 7

One of the following statements is incorrect

Question # 8

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

Question # 9

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 # 10

Mass spectrometer measures the

Question # 11

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

Question # 12

A balloon contains 0.02 gram of H2gas, it contains H2molecules

Question # 13

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

Question # 14

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

Question # 15

The relative atomic mass of chlorine is 35.5. What is the mass of 2 mol of chlorine gas

Question # 16

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

Question # 17

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

Question # 18

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

Question # 19

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

Question # 20

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 # 21

Metal tend to lose electrons, becoming:

Question # 22

C6H12O6and C12H22O11 are:

Question # 23

3.01 x 1022Ag+ions is present in

Question # 24

Which of the following statement is correct for a chemical reaction to occur molecules of substances must

Question # 25

The phenomenon of isotropy was first discovered by

Question # 26

CL2, N2 and O2 are:

Question # 27

Covalent compound s mostly exist in the form of:

Question # 28

Matter is defined as any thing which occupies space and:

Question # 29

0.5 mole of CH4and 0.5 mole of SO2gases have equal

Question # 30

A molecule of haemoglobin is made up if nearly

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ECAT Chemistry Chapter 1 Important MCQ's

Sr.# Question Answer
1 Hemoglobin is 68000 times heavier than:
A. Oxygen atom
B. Nitrogen atom
C. Carbon atom
D. Hydrogen atom
2 0.5 mole of CH4and 0.5 mole of SO2gases have equal
A. Volume
B. Mass in grams
C. Total number of atoms
D. Number of molecules
3 The branch of science dealing with structure, composition and changes in matter and laws and principles which govern these changes is called as
A. chesmistry
B. Geology
C. Physics
D. Mechanics
4 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
5 Molecules of High molecular weight usually greater than 10,000 are called:
A. Macro molecules
B. Mega molecules
C. Poly molecules
D. Gega molecules
6 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
7 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
8 Where energy is released during a reaction it is
A. Exothermic reaction
B. Endothermic reaction
C. A free radical reaction
D. A bond breaking reaction
9 Who one mole of each of the following is completely burned in oxygen, which gives the largest mass of carbon dioxide?
A. Carbon monoxide
B. Diamond
C. Ethane
D. Methane
10 The quantitative relationship between the substances according to balanced equation describes
A. Reversible reactions
B. Stoichiometry
C. Limiting reacting
D. Percentage composition

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