Question # 1

The percentage of H is the highest in

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CH₄

NH₃

H₂SO₄

C₆H₁₂O₆

A reaction is reversible because :

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Products are stable.

Reactants are reactive.

Products are reactive.

Reactants re stable.

Acetylene had a characteristic ethereal smell resembling that of

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Ginger

Vinegar

Garlic

Onion

The divisibility of atom was shown by

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Stoney

J.J. Thomson

Millikan

Rutherford

Alkanes are gases :

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C₁-C₄

C₅-C₁₀

C₁₁-C₁₅

C₁₀-C₂₀

A pollutant affects

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Human health

Quality of life

Functioning of ecosystem

All of these

CaC₂on hydrolysis form

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CH₄

C₂H₄

C₂H₂

C₆H₆

The characteristic reactions of alkanes are

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Addition reactions

Substitution reactions

Condensation reactions

Polymerization reactions

Alkyne is :

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CH_3-CH₃

CH₄

CH₂₌CH₂

C₂H₂

Self condensation of acetaldehyde in the presence of dilute alkalies gives

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An acetal

An aldol

Mesitylene

Propionaldehyde

Aqueous solution of glucose C₆H₁₂O₆, boils at 100.052°C. The solution contains

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180 grams glucose in 1 kg water

18 grams glucose in 1 kg water

1.8 grams glucose in 1 kg water

3.6 grams glucose in 1 kg

Silk is an example of

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Animal fiber

Vegetable fibre

Mineral fibre

None of these

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The heat released is enthalpy of neutralization

The heat released is enthalpy of atomization

The heat released is enthalpy of sublimation

The heat released is enthalpy of formation

pKb value of NH₄OH is 4.74. If the concentration of NH₄OH is 1 molar containing 0.1 molar NH₄Cl, then pH of this buffer will be

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3.74

10.26

4.74

9.26

Geographical survey of Pakistan estimates about billion tons of coal in Pakistan:

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182

183

184

185

The order of dehydration of alcohol

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10> 20> 30

10> 30> 20

20> 30> 10

30> 20> 10

10g of NaOH has been dissolved per kg of solvent. The molality of solution is :

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.25 m

1.5 m

.5 m

2.5 m

Which of the following in incorrect?

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FelCl₃is used in the detection of phenols

Fehling solution is used in the detection of glucose

Tollen's reagent is used in detection of unsaturation

NaHSO₃is used in the detection of carbonyl compounds

Ether shows the phenomenon of

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position isomerism

Chain isomerism

Metamerism

Cir-trans isomerism

On alkali and alkaline earth metals down the group, there is decreasing trend in

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m.p.

b.p.

Ionization potentiall

All of these

Which of the following molecules has zero dipole moment?

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NH₃

CHCl₃

H₂O

BF₃

Polymerization of ethane take place at pressure of 100 atm and a temperature of

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200°C

400°C

600°C

800°C

The rate of which the reaction proceeds is directly proportional to the product of the active masses of the reactants is according to

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Law of mass action

Le Chateliers principle

Equilibrium law

Law of constant proportion

Acetamide is

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Highly acidic

Highly basic

Neutral

amphoteric

SN2 reaction can be best carried out with

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Primary alkyl halides

Secondary alkyl halides

Tertiary alkyl halides

All the three

The factor which effect the rate of reaction

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Nature of reactants

Surface area

Light

All of the above

General formula of alkyl halide is:

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R----X

R----OH

R------COH

R------COOH

Natural rubber is a polymer of

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Butadiene

Ethyne

Styrene

Isoprene

Acetylene is used in the manufacture of

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Rubber

Plastic

Ethyle alcohol

All of these

The function of salt bridge in the galvanic or voltaic cell is to

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Carry out oxidation at anode

To carry out reduction at cathode

Carry out electrolysis

To prevent the net charge accumulation in either of the half cells

An electrolyte

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Forms complex ions solution

Gives ions only when electricity is passed

Possesses ions even in solid state

Gives ions only when dissolved in water

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