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 a and c D

Question # 2

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 # 3

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 # 4

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 # 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

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

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

Question # 7

A process which takes place on its own without any outside assistance and moves from a non-equilibrium stat towards an equilibrium stat is termed as:

Spontaneous process. A
Natural process. B
Non-Spontaneous process. C
Both (a) and (b). D

Question # 8

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 # 9

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 # 10

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 # 11

Some non-spontaneous processes 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 # 12

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 # 13

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 # 14

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 # 15

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 # 16

Burning of coal and hydrocarbon in air are examples of

Non-spontaneous reaction A
Spontaneous reaction B
Natural reaction C
Both b and c D

Question # 17

Calorie is equivalent to :

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

Question # 18

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 # 19

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 # 20

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

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

Question # 21

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 # 22

Reaction between Zn and CuSO₄can be called a system under

Surrounding A
Observation B
system C
None of above D

Question # 23

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

Thermochemistry A
Biochemistry B
Physical chemistry C
Analytical chemistry D

Question # 24

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 # 25

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 # 26

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 # 27

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 # 28

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 # 29

Calorie is equivalent to

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

Question # 30

A state function is a

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

Sr.#	Question	Answer
1	Burning of coal and hydrocarbon in air are examples of	A. Non-spontaneous reaction B. Spontaneous reaction C. Natural reaction D. Both b and c
2	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.
3	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
4	Calorie is equivalent to :	A. 0.4184 J B. 4184 J C. 4.184 J D. 418.4 J
5	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.
6	Work is a	A. State function B. Only function C. Non-state function D. State
7	The subject matter of first law of thermochemistry is based on	A. First law of Thermochemistry B. First law of Thermodynamics C. Second law of Thermochemistry D. Second law of Thermodynamics
8	If an endothermic reaction is allowed to take place very rapidly in the air, the temperature of the surrounding air	A. remains constant B. increases C. decreases D. remain unchanged
9	When a system absorbs energy, the sign of delta E is	A. Neither positive nor negative B. Negative C. Positive D. None of above
10	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

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