Question # 1

If initial concentration of the reactants and half life period of the reaction is known, then we can determine

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Average rate of reaction

Order of reaction

Rate constant k

Instantaneous rate

Dilatometric method is used for rate determination when

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Reactions involving change of optical

Reactions involving change of optical activity

Reactions involving small volume change

None of above

Homogenous catalysis is that in which catalyst and reactants are in same phase. Which one of the following reaction is a homogenous catalysis

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Hydrolysis of ethyl-acetate (ester) has order of reaction :

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3

2

1

The addition of a catalyst to a reaction changes the

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Enthalpy

Entropy

Nature of reactants

Energy of activation

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Measuring pH

Measuring density

Titration against standard NaOH

Titration against standard KMnO₄solution

It is common observation that rates of chemical reactions differ :

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Greatly.

A little bit.

Moderately.

The unit rate of constan K ismole^-1 dm³S^-1for a chemical reaction, the order of reaction is :

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3

2

1

0

The unit of rate constant K ismole^-1 dm³for a chemical reaction, the order of reaction is :

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Order of reaction can determined by an experiment

Order of reaction can determined from a balance equation only.

Order of reaction can determined increases by increasing temperate.

Order of reaction must be in whole number and not in fraction.

The example of a photo chemical reaction is photosynthesis has order of reaction :

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1

2

0

3

For a chemical reaction to take place the particles must have sufficient energy for the effective collisions, the energy is called

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Average energy

Activation energy

Potential energy

Collision energy

In the hydrolysis of CH₃COOC₂H₅the acid produced is

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Inhibitor

Catalyst

Auto catalyst

None of above

A substance which increases the rate of a reaction without being consumed during the reaction is called

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An autocatalyst

A catalyst

A negative catalyst

All of these

The reaction rate is expressed in the units of

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mol dm^-3S^-

mol dm^-3

mol dm^-3N^-

dm^-3S^-

Group l-A elements react with water fastly than the reaction of group ll-A elements because

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l_Aelements are more soft then ll_A

l_Aelements are non-metals

l_Aelements have 1 electron in their outermost s-orbital and are strongly electropositive

l_Aelements make ionic bond

Refrectrometric method is used when

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Reactions involving absorption of I.R. or U. V

Reactions involving change of refractive index

Reactions involving ions

Change of optical activity

If the rate of decay of radioactive isotope decreases from 200 cpm to 25 cpm after 24 hours, what is its half life :

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8 hours

6 hours

4 hours

3 hours

In the reaction of oxalic acid with KMnO₄and H₂SO₄is slow at the beginning but after sometimes the reaction becomes faster due to

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Formation of MnSO₄which acts as 'Auto catalyst

Formation of CO₂which acts as 'Auto catalyst

Formation of K₂SO₄which acts as 'Auto catalyst

Evolution of O₂gas which acts as 'Auto catalyst

The rate of reaction is denoted by

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dc/dp

dc/ac

dc/dT

dc/dt

When we perform the same reaction by taking two different initial concentrations of a reactant for a second order reaction then

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Reaction becomes exothermic

Energy of activation is different

Mechanism of reaction is changed

Half life period is changed

In the hydrolysis of CH₃COOC₂H₅the acid produced is

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Inhibitor

Catalyst

Auto catalyst

None of above

If half life period of a reaction is independent of the concentration of the reactants, then the reaction is

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Zero order

First order

Second order

Order is in fraction

A white precipitate ofsilver chlorideimmediately formed on additionof :

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Silver nitrate solution to sodium chloride solution.

Silver chloride solution to sodium nitrate solution.

Silver nitrate solution to potassium chloride solution

Silver nitrate solution to hydrogen chloride solution.

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