Question # 1

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

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Thermochemistry.

Biochemistry.

Physical chemistry.

Analytical chemistry.

Calorie is equivalent to

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0.4184 J

41.84 J

4.184 J

418.4 J

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

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Imaginary line

Boundary

Real line

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

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

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)

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.

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).

The majority of reactions which give stable products are

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Exothermic

Isothermal

Endothermic

Both a and c

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.

In endothermic reactions, the heat contents of the:

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Products equal to the reactants.

Reactants more than that of products.

Products more than that of reactants

Both (b) and (c)

Which one of the following is not related to spontaneous process

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Unidirectional

Real

Irreversible

Artificial

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.

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.

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.

Reaction between Zn and CuSO₄can be called a system under

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Surrounding

Observation

system

None of above

Calorie is equivalent to :

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0.4184 J

4184 J

4.184 J

418.4 J

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

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Pink

Purple

Blue

Brown

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).

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

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Unidirectional.

Real.

Irreversible.

Artificial.

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.

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

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Thermochemistry

Biochemistry

Physical chemistry

Analytical chemistry

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 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

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

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Neither positive nor negative

Negative

Positive

None of above

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