Question # 1

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

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Joule.

Calorie.

Kilo Joule.

Both (a) 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

increases

decreases

remain unchanged

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.

Calorie is equivalent to :

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0.4184 J

4184 J

4.184 J

418.4 J

Calorie is equivalent to

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0.4184 J

41.84 J

4.184 J

418.4 J

When no work is done by the system

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The volume of system decreases

The volume of system increases

The volume of system does not change

None 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.

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.

Which one of the following is not related to spontaneous process

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Unidirectional

Real

Irreversible

Artificial

Neutralization of a strong acid with a strong base is

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Natural acid base reaction

Artificial acid base reaction

Spontaneous acid base reaction

both a and c

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.

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.

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

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:

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Spontaneous process.

Natural process.

Non-Spontaneous process.

Both (a) and (b).

The majority of reactions which give stable products are:

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Exothermic.

Isothermal.

Endothermic.

Both (b) and (c).

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.

Neutralization of a strong acid with a strong abase is:

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Natural acid base reaction.

Artificial acid base reaction.

Spontaneous acid base reaction.

Both (a) and (c).

A state function is a

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Microscopic property

Macroscopic

Unique property

Both a and c

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

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Unidirectional.

Real.

Irreversible.

Artificial.

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.

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

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Energy can neither be created no destroyed.

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

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

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

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.

The majority of reactions which give stable products are

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Exothermic

Isothermal

Endothermic

Both a and c

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 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

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Henry's law

Joule's princile

Hess's law

law of conservation of energy

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

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.

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

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Neither positive nor negative

Negative

Positive

None of above

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

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Thermochemistry.

Biochemistry.

Physical chemistry.

Analytical chemistry.

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

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