ECAT Pre Engineering Chemistry Chapter 7 MCQ Test With Answer

Question # 1

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 # 2

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 # 3

Calorie is equivalent to :

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

Question # 4

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 # 5

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 # 6

By state, we mean the

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

Question # 7

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 # 8

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

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

Question # 9

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 # 10

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 # 11

In endothermic reactions, the heat contents of the surrounding air

Remains constant A
Decreases B
Increases C
Fluctuates rapidly D

Question # 12

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 # 13

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 # 14

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 # 15

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 # 16

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 # 17

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 # 18

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 # 19

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

Spontaneous process A
Natural process B
Non-spontaneous process C
Both a and b D

Question # 20

Calorie is equivalent to

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

Question # 21

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 # 22

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 # 23

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 # 24

Reaction between Zn and CuSO₄can be called a system under

Surrounding A
Observation B
system C
None of above D

Question # 25

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

Question # 26

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 # 27

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 # 28

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 # 29

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 # 30

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

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 (a) and (C)
2	When a piece of zinc is added to the copper sulfate solution,____________ color of solution disappear.	A. Pink. B. Purple. C. Blue. D. Brown.
3	The energy units in which heat changes usually expressed in SI-system are	A. Joule B. Calorie C. Kilo Joule D. Both a and c
4	The change in heat energy of a chemical reaction at constant temperature and pressure is called :	A. Enthalpy change. B. Seat of sublimation. C. Bind energy. D. Internal energy change.
5	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.
6	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.
7	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
8	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)
9	Reaction between Zn and CuSO₄can be called a system under	A. Surrounding B. Observation C. system D. None of above
10	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

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