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

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 # 3

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

Joule. A
Calorie. B
Kilo Joule. C
Both (a) and (c) D

Question # 4

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 # 5

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 # 6

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 # 7

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 # 8

A reaction will also be called a spontaneous if :

It does no 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 stat with. 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
increases B
decreases C
remain unchanged D

Question # 10

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 # 11

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 # 12

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 # 13

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 # 14

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 # 15

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 # 16

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 # 17

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 # 18

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 # 19

In endothermic reactions, the heat contents of the surrounding air

Remains constant A
Decreases B
Increases C
Fluctuates rapidly D

Question # 20

Which one of the following is not related to spontaneous process

Unidirectional A
Real B
Irreversible C
Artificial D

Question # 21

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 # 22

A state function is a

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

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 # 25

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 # 26

Work is a

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

Question # 27

The majority of reactions which give stable products are

Exothermic A
Isothermal B
Endothermic C
Both a and c D

Question # 28

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 # 29

The reaction of zinc with the copper sulfate solution is an example of.

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

Question # 30

Calorie is equivalent to

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

Sr.#	Question	Answer
1	The study of heat changes accompanying a chemical reaction is known as	A. Thermochemistry B. Biochemistry C. Physical chemistry D. Analytical chemistry
2	The majority of reactions which give stable products are:	A. Exothermic. B. Isothermal. C. Endothermic. D. Both (b) and (c).
3	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
4	Calorie is equivalent to	A. 0.4184 J B. 41.84 J C. 4.184 J D. 418.4 J
5	In a chemical change, the energy in the from of heat will either be evolved or absorbed and this is called:	A. Endothermic. B. Heat of products. C. Exothermic reaction. D. Heat of reaction.
6	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
7	If an endothermic reaction is allowed to take place very rapidly in air, the temperature of the surrounding air	A. Remains constant B. Decreases C. Increases D. Fluctuates rapidly
8	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
9	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:	A. Spontaneous process. B. Natural process. C. Non-Spontaneous process. D. Both (a) and (b).
10	For a given process, the heat changes at constant volume ( q_v)are related to other as:	A. q_p= q_v B. q_p<q_v C. q_p>q_v D. q_p=q_v/2

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