ECAT Pre Engineering Chemistry Chapter 7 MCQ Test With Answer

Question # 1

The majority of reactions which give stable products are:

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

Question # 2

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 # 3

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 # 4

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 # 5

The subject matter of first law of thermochemistry is based on:

First law of Themochemistry. A
First law of Thermodynamics. B
Second law of Themochemistry. C
Second law of Thermodynamics. D

Question # 6

In a chemical change, the energy in the form of heat will either be evolved or absorbed and this is called

Endothermic A
Heat of products B
Exothermic reaction C
Heat of reaction D

Question # 7

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 # 8

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

Remains constant. A
Increase. B
Decreases. C
Remain unchanged. D

Question # 9

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 # 10

By state, we mean the

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

Question # 11

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

Thermochemistry A
Biochemistry B
Physical chemistry C
Analytical chemistry D

Question # 12

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

remains constant A
increases B
decreases C
remain unchanged D

Question # 13

By comparing both initial and final states of the system, we can describe the change taking place in the

Surrounding A
Both a and c B
System C
None of above D

Question # 14

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

Enthalpy change. A
Seat of sublimation. B
Bind energy. C
Internal energy change. D

Question # 15

Which of the following statements is contrary to the first law of thermodynamics?

Energy can neither be created no destroyed. A
One form of energy can be transferred into an equivalent amount of the kinds of energy. B
In a adiabatic process, the work done is independent of its path. C
Continuous production of mechanical work without supplying an equivalent amount of heat is possible. D

Question # 16

When a system absorbs energy, the sign of delta E is

Neither positive nor negative A
Negative B
Positive C
None of above D

Question # 17

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 # 18

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 # 19

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 # 20

In a chemical change, the energy in the from of heat will either be evolved or absorbed and this is called:

Endothermic. A
Heat of products. B
Exothermic reaction. C
Heat of reaction. D

Question # 21

For a given process, the heat changes at constant volume ( q_v)are related to other as:

q_p= q_v
A
q_p<q_v
B
q_p>q_v
C
q_p=q_v/2
D

Question # 22

Work is a

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

A state function is a

Microscopic property A
Macroscopic B
Unique property C
Both a and c D

Question # 25

Which of the following statements is contrary to the first law of themodynamics

Energy can neither be created nor destroyed A
One form of energy can be transferred into an equivalent amount of other kinds of energy B
In an adiabatic process, the work done is independent of its path C
Continuous production of mechanical work without supplying and equivalent amount of heat is possible D

Question # 26

Calorie is equivalent to :

0.4184 J A
4184 J B
4.184 J C
418.4 J D

Question # 27

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 # 28

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 # 29

Enthalpy of neutralization of all the strong acids and strong bases has the same value because:

Neutralization leads to the formation of salt and water. A
Strong acids and bases are ionic substances. B
Acids always give rise to H⁺ions and bases always furnish OH^-ions. C
The net chemical change involve the combination of H⁺ and OH^-ions to form water. D

Question # 30

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

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

Sr.#	Question	Answer
1	Which of the following statements is contrary to the first law of themodynamics	A. Energy can neither be created nor destroyed B. One form of energy can be transferred into an equivalent amount of other kinds of energy C. In an adiabatic process, the work done is independent of its path D. Continuous production of mechanical work without supplying and equivalent amount of heat is possible
2	Which one of the following is not related to spontaneous process.	A. Unidirectional. B. Real. C. Irreversible. D. Artificial.
3	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
4	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
5	In endothermic reactions, the heat contents of the:	A. Products equal to the reactants. B. Reactants more than that of products. C. Products more than that of reactants D. Both (b) and (c)
6	It is noticed that energy in the from 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	A reaction will also be called a spontaneous if	A. It does not need energy to start with B. It needs energy to carry the whole process C. It needs energy at the end of reaction D. It needs energy to start with
8	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:	A. Henry's law. B. Joule's principle. C. Hess's law. D. Law of conservation of energy.
9	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
10	For the reaction : NaOH + HCl---------------> NaCl + H₂O the change in enthalpy is called:	A. Heat of reaction. B. Heat of formation. C. Heat of neutralization. D. Heat of combustion.

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