Question # 1

The unit of rate constant depends upon

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Number of reactants

Concentration terms

Order of reaction

Molecularity of reaction

After 3 half lives of a chemical reaction, the % fraction of the amount left is

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6.25

75

12.5

50

The nature of positive rays depends on

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The nature of electrode.

The nature of discharge tube

The nature of residual gas

All of the above

The unit of the 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 S.I. units for the molar heat capacity are

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Joule Cm^-3degree^-1

Joule deg^-1atm^-1

Joule deg^-1mol^-1

Joule deg^-1kg^-1

When HCl is added to H2S aqueous solution, Its ionization

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Decrease

Increase

Remains constant

First increases than decreases

The substance used for decolorization of crystalline substance is

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G2O5

Chloroform

Animal charcoal

Soda ash

The sum of pH and pOH is

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0

7

14

10

The cathodic reaction in the electrolysis of dil H2SO4 with Pt electrodes is.

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Reduction

Oxidation

Both oxidation or reduction

Neither oxidation nor raduction

The net change in a chemical reaction is same whether it takes place directly or indirectly is

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Henry's law

Charles's

Hess's lass

Graham's law

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

A single lead cell provides volts

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2

4

6

8

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The value of K_pfalls with a rise in temperature

The value of K_pfalls with increasing pressure

Adding V₂O₅catalyst increase the equilibrium yield of sulphur trioxide

The value of K_pis equal to K_c

Which of the hydrogen halides has the highest percentage of ionic character.

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HF

HBr

HCl

HI

In paper chromatograghy the point at which the solvent rises to maximum extent is called

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Event

Chromatogram

Solvent front

Base line

Cathode rays strike alumina and produce a ..........colour.

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Red

Blue

Yellow

Green

Depression of freezing point method is used for determination of molar masses of

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Electrolytes

Non-volatile solids

Volatile solids

Volatile liquids

The number of moles of hydrogen atoms in 3.2 g of methane CH4.

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0.2

0.4

0.6

0.8

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