Question # 1

The unit of rate constant is the 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.

The rate determining step is the :

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Slowest step.

Fastest step.

Moderate step.

Both (a) and (b).

When initial concentration of reactants an order of reaction is given, then its half life period can be calculated by the equation

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For effective collisions the molecules slow down before collision and their kinetic energy decreases which results in increase in their

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Activation energy

Average energy

Potential energy

Collisions frequency

The rate of reaction :

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Increase as the reaction proceeds.

Decreases as the reaction proceeds.

Remains the same as the reaction proceed.

May decrease or increase as the reaction proceeds.

The catalytic activity of Pt is much higher when

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It is mixed with asbestos

It is mixed with Pd

It is mixed with arsenic

In is made colloidal platinum

Which technique is used to determine the absorption of radiations?

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Dilatometer method

Optical rotation method

Spectrometry

Refractometric method

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Rate = k[FeCl₃] [Kl]²

Rate = k[Fe⁺³][Cl^-1] [Kl]

Rate = k[Fe⁺³] [Cl^-1][K;]

Rate = k[Kl]³[FeCl₃]°

When copper is allowed to react with HNO₃, the reaction is slow in the beginning, finally becomes very fast. It is due to the formation of an auto catalyst which is

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Cu(NO₃)₂

CuO

O₂

HNO₂

Factor which slows down the rate of reaction is

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Small size of the particles of the reactant

High temperature of reaction

More concentration of reactant

Lowering the temperature

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1st order

2nd order

Zero order

3rd order

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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The number of atoms or molecules whose concentrations determine the rate of the reaction is called

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Molecularity

Order

Rate of reaction

Rate constant

The rate of reaction between two specific time intervals is called

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Instantaneous rate

Average rate

Specific rate

Ordinary rate

In the manufacture of NH₃by Haber's process catalyst used is iron its catalytic efficiency is poisoned by

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Presence of Al₂O₃

Presence of Cr₂O₃

MnO₂

CO present with H₂gas

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Zero

1

2

1.5

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2

3

4

9

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Initial concentration of reaction

Initial concentration of products

Final concentration of products

Order of the reaction

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

Which statement is not correct

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Enzymes catalyst a specific reaction

Enzymes show catalytic activity at a specific temperature

The catalytic activity of enzymes is stopped if optimum pH is changed

The catalytic activity is poisoned by a co-enzymes

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.

If a reactant or product of a reaction absorbs radiation, then physical method for determining the rate of reaction is

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Spectrometry

Refractometry

Conductivity measurement

Optical method

A pseudo uni-molecular reaction has order of reaction :

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3

2

1

0

The rate of reaction is denoted by

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dc/dp

dc/ac

dc/dT

dc/dt

The experimental relationship between a reaction rate and the concentration of reactants is known as

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Order

Molecularity

Rate constant

Rate law

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

The rate constant k of a reaction activation energy Ea and temperature are related by Arrhenius in the form of an equation which is

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With increases of 10°C temperature the rate of reactiondoubles. This increase in rate of reactionis due to :

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Decrease in activation energy or reaction.

Decrease in number of collisions between reactant molecules.

Increase in activation energy of reactants.

Increase in number of effective collisions

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Small change in concentration of product

Small time internal

Co-efficient of the reactant

Co-efficient of the product

______ are called biocatalysts

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Organic acids

Organic bases

Enzymes

All

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Homogeneous

Heterogeneous

Isogeneous

None

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