Question # 1

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

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

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

In endothermic reactions, the heat contents of the surrounding air

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Remains constant

Decreases

Increases

Fluctuates rapidly

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

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

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

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Enthalpy change.

Seat of sublimation.

Bind energy.

Internal energy change.

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 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

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.

The real or imaginary surface separating the system from the surrounding is called

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Imaginary line

Boundary

Real line

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 energy units in which heat changes usually expressed in SI-system are

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Joule

Calorie

Kilo Joule

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

The majority of reactions which give stable products are:

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Exothermic.

Isothermal.

Endothermic.

Both (b) and (c).

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

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

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.

Burning of coal and hydrocarbon in air are examples of :

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Non-spontaneous reaction.

Spontaneous reaction.

Natural reaction

Both (a) and (C)

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).

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

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Pink.

Purple.

Blue.

Brown.

In a chemical change, the energy in the from 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.

The reaction of Zinc with copper sulphate solution is an example of

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Oxidation reduction reaction

Spontaneous reaction

Spontaneous redox reaction

Non-spontaneous reaction

Burning of coal and hydrocarbon in air are examples of

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Non-spontaneous reaction

Spontaneous reaction

Natural reaction

Both b and c

When a piece of zinc is added to the copper sulphate solution, _______ colour of solution disappear

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Pink

Purple

Blue

Brown

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.

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.

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

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

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