Question # 1

The true representation for the units of rate constant K for the first order reaction

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sec^-1

mole dm^-3s

mole dm^-3s^-1

mole^-1dm⁺³s^-1

If the energy of the activated complex lies close to energy of reactants, it means that reaction is

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Slow

Fast

Exothermic

Endothermic

Which statement is incorrect about activated complex

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Short lived

Maximum energy

Unstable combination of atoms

Less energy than Ea

When a chemical reaction is completed the

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Instantaneous rate > average rate

Instantaneous rate = average rate

Instantaneous rate is zero

Both average and instantaneous rates become zero

The rate of reaction determined at any given time is called.

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Average rate

Instantaneous rate

Spontaneous rate

Over all rate

If reactants have very low activation energy it means that reaction is.

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Slow

Fast

Endothermic

Exothermic

Dilatometer method is useful for the reactions that involve.

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Ionic species

Where reactant absorb U.V. visible or infrared radiations

Small volume changes in solutions

Change in refractive indices

The quantitative relationship between rate and concentration is given by.

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Law of mass action

Rate law

Both of these

Le Chatelier's principle

Which statement is incorrect about order of reaction

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It cannot be determined experimentally

It is determined experimentally

Sum of exponents in rate equation

It can have fraction value

The unit of the rate constant is same as that of the rate of reaction in

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First order reaction

Second order reaction

Zero order reaction

Third order reaction

Half -Life for a given reaction is doubled if initial concentration is doubled. The order of reaction is.

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0

1

2

3

With increases of 10 oC temperature the rate of reaction doubles. This increase in rate of reactions is due to.

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Decrease in activation energy of reaction

Decrease in the number of collisions between reactant molecules

Increase in activation energy of reactants

Increase in number of effective collisions

A substance which itself is not a catalyst but increases the activity of a catalyst is called.

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Promoter

Poisoner

Inhibitor

Enzyme

Chemical reactivity of different substance is controlled by

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Atomic number

Electronic arrangement

Mass number

Number of isotope of reactant elements

A type of meals are usually used as catalyst.

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Coinage metal

Alkali metals

Transition metals

alkaline earth metals

A substance which rerareds the rate of a reaction is called

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Inhibitor

Activator

Auto-catalyst

None of these

Photosynthesis a photochemical reaction has order of reaction

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0

1

2

Fractional order

Which properties of liquid is measured by polarimeter

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Conductance

Refractive index

Optical activity

Change in volume

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