Question # 1

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 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

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)

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)

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.

Which one of the following is not related to spontaneous process

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Unidirectional

Real

Irreversible

Artificial

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

In endothermic reactions, the heat contents of the surrounding air

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Remains constant

Decreases

Increases

Fluctuates rapidly

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

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

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 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

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.

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.

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 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

Reaction between Zn and CuSO₄can be called a system under

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Surrounding

Observation

system

None 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

A state function is a

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Microscopic property

Macroscopic

Unique property

Both a and c

Work is a

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State function

Only function

Non-state function

State

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 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 air, the temperature of the surrounding air :

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Remains constant.

Decreases.

Increases.

Fluctuates rapidly.

The reaction of zinc with the copper sulfate solution is an example of.

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Oxidation reduction reaction.

Spontaneous reaction.

Spontaneous redox reaction.

Non-spontaneous reaction.

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.

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