Question # 1

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

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entahlpy change

heat of sublimation

bond energy

internal energy change

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

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Surrounding

System and surrounding

System

State function

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

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Physical change

Chemical change

Biological change

All of above

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

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Heat of reaction.

Heat of formation.

Heat of neutralization.

Heat of combustion.

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

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First law of Themochemistry.

First law of Thermodynamics.

Second law of Themochemistry.

Second law of Thermodynamics.

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

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remains constant

increases

decreases

remain unchanged

The majority of reactions which give stable products are:

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Exothermic.

Isothermal.

Endothermic.

Both (b) and (c).

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

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Remains constant.

Increase.

Decreases.

Remain unchanged.

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

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Pink.

Purple.

Blue.

Brown.

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

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Thermochemistry

Biochemistry

Physical chemistry

Analytical chemistry

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:

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Henry's law.

Joule's principle.

Hess's law.

Law of conservation of energy.

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

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q_p= q_v

q_p<q_v

q_p>q_v

q_p=q_v/2

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

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Spontaneous process

Natural process

Non-spontaneous process

Both a and b

The subject matter of first law of thermochemistry is based on

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First law of Thermochemistry

First law of Thermodynamics

Second law of Thermochemistry

Second law of Thermodynamics

Calorie is equivalent to :

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0.4184 J

4184 J

4.184 J

418.4 J

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

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Remains constant.

Decreases.

Increases.

Fluctuates rapidly.

Calorie is equivalent to

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0.4184 J

41.84 J

4.184 J

418.4 J

Reaction between Zn and CuSO₄can be called a system under

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Surrounding

Observation

system

None of above

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

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Neutralization leads to the formation of salt and water.

Strong acids and bases are ionic substances.

Acids always give rise to H⁺ions and bases always furnish OH^-ions.

The net chemical change involve the combination of H⁺ and OH^-ions to form water.

In endothermic reactions, the heat content of the:

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Products is more than that of reactants.

Reactants is more than than to products.

Both (a) and (b).

Reactants and products are equal.

Some non-spontaneous processes can be made to take place by supplying energy to the system from

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Internal source

Any source

External source

All of above

A reaction will also be called a spontaneous if :

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It does no need energy to start with.

It needs energy to carry the whole process.

It needs energy at the end of reaction.

It needs energy to stat with.

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

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Energy can neither be created nor destroyed

One form of energy can be transferred into an equivalent amount of other kinds of energy

In an adiabatic process, the work done is independent of its path

Continuous production of mechanical work without supplying and equivalent amount of heat is possible

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

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Endothermic

Heat of products

Exothermic reaction

Heat of reaction

Which one of the following is not related to spontaneous process

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Unidirectional

Real

Irreversible

Artificial

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

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Physical change.

Chemical change.

Biological change.

All of above.

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

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Remains constant

Decreases

Increases

Fluctuates rapidly

A state function is a

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Microscopic property

Macroscopic

Unique property

Both a and c

A reaction will also be called a spontaneous if

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It does not need energy to start with

It needs energy to carry the whole process

It needs energy at the end of reaction

It needs energy to start with

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

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Internal source.

Any source.

External source.

All of above.

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