ECAT Pre Engineering Chemistry Chapter 7 MCQ Test With Answer

Question # 1

The study of heat changes accompanying a chemical reaction is known as :

Thermochemistry. A
Biochemistry. B
Physical chemistry. C
Analytical chemistry. D

Question # 2

The net heat in a chemical reaction is same, whether it is brought about in two or more different ways in one or several steps. It is known as

Henry's law A
Joule's princile B
Hess's law C
law of conservation of energy D

Question # 3

Neutralization of a strong acid with a strong abase is:

Natural acid base reaction. A
Artificial acid base reaction. B
Spontaneous acid base reaction. C
Both (a) and (c). D

Question # 4

It is noticed that energy in the form of heat is either evolved or absorbed as a result of a

Physical change A
Chemical change B
Biological change C
All of above D

Question # 5

The reaction of Zinc with copper sulphate solution is an example of

Oxidation reduction reaction A
Spontaneous reaction B
Spontaneous redox reaction C
Non-spontaneous reaction D

Question # 6

The subject matter of first law of thermochemistry is based on

First law of Thermochemistry A
First law of Thermodynamics B
Second law of Thermochemistry C
Second law of Thermodynamics D

Question # 7

The majority of reactions which give stable products are

Exothermic A
Isothermal B
Endothermic C
Both a and c D

Question # 8

Which one of the following is not related to spontaneous process

Unidirectional A
Real B
Irreversible C
Artificial D

Question # 9

Some Non-spontaneous process can be made to take place by supplying energy to the system from :

Internal source. A
Any source. B
External source. C
All of above. D

Question # 10

In endothermic reactions, the heat contents of the:

Products equal to the reactants. A
Reactants more than that of products. B
Products more than that of reactants C
Both (b) and (c) D

Question # 11

Burning of coal and hydrocarbon in air are examples of :

Non-spontaneous reaction. A
Spontaneous reaction. B
Natural reaction C
Both (a) and (C) D

Question # 12

It is noticed that energy in the from of heat is either evolved or absorbed as a result of a:

Physical change. A
Chemical change. B
Biological change. C
All of above. D

Question # 13

The net heat change in a chemical reaction is same, whether it is brought about in two or more different ways in one or several steps. It is known as:

Henry's law. A
Joule's principle. B
Hess's law. C
Law of conservation of energy. D

Question # 14

In endothermic reactions, the heat contents of the surrounding air

Remains constant A
Decreases B
Increases C
Fluctuates rapidly D

Question # 15

One mole of oxygen confined in a cylinder fitted with a piston is an example of

Surrounding A
System and surrounding B
System C
State function D

Question # 16

The real or imaginary surface separating the system from the surrounding is called

Imaginary line A
Boundary B
Real line C
All of above D

Question # 17

For the reaction : NaOH + HCl---------------> NaCl + H₂O the change in enthalpy is called:

Heat of reaction. A
Heat of formation. B
Heat of neutralization. C
Heat of combustion. D

Question # 18

A reaction will also be called a spontaneous if

It does not need energy to start with A
It needs energy to carry the whole process B
It needs energy at the end of reaction C
It needs energy to start with D

Question # 19

By state, we mean the

Reaction of system A
Scope of a system B
Condition of a system C
None of above D

Question # 20

The majority of reactions which give stable products are:

Exothermic. A
Isothermal. B
Endothermic. C
Both (b) and (c). D

Question # 21

In endothermic reactions, the heat content of the:

Products is more than that of reactants. A
Reactants is more than than to products. B
Both (a) and (b). C
Reactants and products are equal. D

Question # 22

The change in heat energy of a chemical reaction at constant temperature and pressure is called

entahlpy change A
heat of sublimation B
bond energy C
internal energy change D

Question # 23

If an endothermic reaction is allowed to take place very rapidly in air, the temperature of the surrounding air :

Remains constant. A
Decreases. B
Increases. C
Fluctuates rapidly. D

Question # 24

When a piece of zinc is added to the copper sulfate solution,____________ color of solution disappear.

Pink. A
Purple. B
Blue. C
Brown. D

Question # 25

Which one of the following is not related to spontaneous process.

Unidirectional.
A
Real. B
Irreversible.
C
Artificial. D

Question # 26

When no work is done by the system

The volume of system decreases A
The volume of system increases B
The volume of system does not change C
None of above D

Question # 27

Neutralization of a strong acid with a strong base is

Natural acid base reaction A
Artificial acid base reaction B
Spontaneous acid base reaction C
both a and c D

Question # 28

If an endothermic reaction is allowed to take place very rapidly in air, the temperature of the surrounding air

Remains constant A
Decreases B
Increases C
Fluctuates rapidly D

Question # 29

Work is a

State function A
Only function B
Non-state function C
State D

Question # 30

The energy units in which heat changes usually expressed in SI-system are

Joule A
Calorie B
Kilo Joule C
Both a and c D

Sr.#	Question	Answer
1	When a piece of zinc is added to the copper sulfate solution,____________ color of solution disappear.	A. Pink. B. Purple. C. Blue. D. Brown.
2	The real or imaginary surface separating the system from the surrounding is called	A. Imaginary line B. Boundary C. Real line D. All of above
3	When a system absorbs energy, the sign of delta E is	A. Neither positive nor negative B. Negative C. Positive D. None of above
4	One mole of oxygen confined in a cylinder fitted with a piston is an example of	A. Surrounding B. System and surrounding C. System D. State function
5	The study of heat changes accompanying a chemical reaction is known as	A. Thermochemistry B. Biochemistry C. Physical chemistry D. Analytical chemistry
6	It is noticed that energy in the form of heat is either evolved or absorbed as a result of a	A. Physical change B. Chemical change C. Biological change D. All of above
7	The energy units in which heat changes usually expressed in Sl-system are:	A. Joule. B. Calorie. C. Kilo Joule. D. Both (a) and (c)
8	The majority of reactions which give stable products are	A. Exothermic B. Isothermal C. Endothermic D. Both a and c
9	The change in heat energy of a chemical reaction at constant temperature and pressure is called	A. entahlpy change B. heat of sublimation C. bond energy D. internal energy change
10	If an endothermic reaction is allowed to take place very rapidly in the air, the temperature of the surrounding air:	A. Remains constant. B. Increase. C. Decreases. D. Remain unchanged.

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