Question # 1

A half reaction can be defines as :

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It always occurs at cathode.

Involves only half of a mole of electrolyte.

Occurs at one of the electrode.

Goes only half way to completion.

A solution sucrose is 34.2%. The volume of solution containing one mole of solute :

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342cm³

1000cm³

500cm³

242cm³

Molecular orbitals are filled with the available electrons according to:

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Hund's of rule.

Pauli's exclusion principle.

Aufbau principle.

All of above.

A nucleoside may be

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Ribonuleoside

Deoxyribonucleoside

Both a and b

None

Indicate the correct statement

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All lanthanidees are present in the same group

All halogens are present in the same period

All the alkali metals are present in the same group

All the noble gases are present int he same period

As a fixing agent in photography, sodium thisoulphate is used for

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Dissolving out unreacted silver bromide

Converting silver

Reducing solubility of AgBr

Preventing overdeveloping and fogging

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1-bromobutane

2-bromobutane

1-bromo-2-methyl propane

2-bromo-2-methyl propane

Which of the following is a tetrabasic acid?

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ORthophosphoric acid

Hyposphosphorus acid

Metaphosphoric

Pyrophosphoric acid

The reaction in which ketone is reduced to the alkane is called

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Kolb

Clemmensen

Cannizzaro

None

The wave length of electron as wave is 0.5 nm. What is the wave length in meter

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5 x 10^-9

5 x 10^-12

5 x 10^-6

5 x 10^-10

1 erg of energy corresponds to

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6.02 x 10²³J/mol

6.02 x 10¹⁶J/mol

1 erg/mol

10^-7J/mol

A compound contains one atom of oxygen and % of O 34.78, then molecular mass of compound is

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46

78

110

180

Which one of the following reactions is not spontaneous

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which one of the following is a heteroheneous catalysis

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Which of the following favours the reverse reaction in chemical equilibrium?

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Increasing the concentration of the reactant

Removal of the least one of the products at regular intervals

Increasing the concentration of one or more of the products

None of these

Molecular orbital picture of N₂indicates

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One unpaired electron

Two unpaired electron

No unpaired electron

None of these

What is the total number of different chloroethanes, formula C₂H_6-nCl_n, where n can be any integer from 1 to 4

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4

6

7

8

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2, 2, 4-trimethylpentane

2, 4, 4-trimethylpentane

2, 4, 4-methyepentane

2, 2, 4-methylpentane

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1, 5-pentadiene

Penta-1, 4-diene

1, 1-pentadiene

1, 4-pentene

What is the nature of SO₂

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Basic

Strongly acidic

Weakly acidic

Amphoteric

Hydrocarbans, SO₂, CO, NH₃, nitrogen oxides and compounds of fluorine are called

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Primary pollutant

Secondary pollutant

Tertiary pollutant

None of these

Carboxylic acids having carboxyl group one is called:

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Mono carboxylic acid

Di-carboboxylic acid

Tri carboxilic acid

Tetra carboxylic acid

Without proper suction filtration is

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Rapid process.

Fague process.

Slow process.

Useless process.

Which isomers of C₅H₁₁OH gives, on dehydration, the greatest number of different alkenes

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Ethanol is prepared in Pakistan form fermentation of:

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Starch

Sugar

Glucose

Molasses

In passage of electricity through aqueous solution of AgNO₃silver dissolves at anode to form Ag⁺, the electrodes are

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Silver metal

Pt metal

Graphite

Copper metal

With the reference of w/m ratio of anode rays, the e/m ratio of cathode rays s:

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Greater.

same.

Smaller.

Not fixed.

Metal used in the preparation of Grignard's reagent is:

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Ca

Na

Mg

Zn

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32 g

3.2 g

5.6 g

9.6 g

Law of mass action was given by :

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Guldberg and Waage.

Berkeley and Hartly.

Ramsay and Reyleigh.

Berthelot.

Acetic acid is manufactured by:

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Distillation

Fermentation

Ozonolysis

Esterification

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