Question # 1

The rate of E₁reaction depends upon

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The concentration of substrate

The concentration of nucleophile

THe concentration of substrate as well as nucleophile

None of the above

Which of the following metals is sometimes found in native state in nature?

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Al

Cu

Fe

Mg

Compounds having the same molecular formula, but different functional groups show

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Metamerism

Position isomerism

Chain isomerism

Functional group isomerism

Phosphorous helps the growth of

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Root

Leave

Stem

Seed

The most reactive compound for electrophilic nitration will be

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Benzyl chloride

Benzoic acid

Nitrobenzene

Chlorobenzene

Which reagent will distinguish a ketone from an aldehyde

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Br₂

2, 4-dinitrophenylhydrazine

NaBH₄

Tollen's reagent

In a group IIA from top to bottom as the atomic number increases, there is regular decreases in

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Ionic size

Atomic size

Ionization potential

None of these

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2-bromo-3-methylbutane

3-methyl-2-bromobutane

2-methyl-3-bromobutane

All of these

Tollen's reagent is

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Ammonical cuprous chloride

Ammonical cuprous oxide

Ammonical silver bromide

Ammonical silver nitrate

Energy of electron in first orbit of H atom is

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-45.32 KJ/mole

-82.08 KJ/mole

-52.53 KJ/mole

-1313.31 KJ/mole

Hydrolytic reaction of fats by causic soda is known as

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Acetylation

Carboxylation

Esterification

Saponification

How many cm³of 1 M H₂SO₄required to neutralize 10 cm³of 1 M NaOH

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2 cm³

2.5 cm³

5 cm³

10 cm³

Which of the following cannot be produced by acidic dehydration of alcohols?

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Ethers

Aldehyde

Alkyl Hydrogen sulphate

Alkene

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Reversible reaction

Irreversible reaction

Spontaneous reaction

None of these

The reduction potential to copper electrode is +0.34 V and that of Zn electrode is -0.76 V. when these two are coupled the e.m.f. of the cell is

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-0.42 V

+0.42

-1.10 V

+1.10 V

The most commonly and widely used nitrogen fertilizer in Pakistan is

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Urea

Ammonium nitrate

Ammonium sulphate

Ammonium chloride

K_bvalue of NH₄OH is 1.81 x 10^-5and its conjugate acid has K_a= 5.7 x 10^-10pKb of the base is 4.74, pKa of its conjugate acid is

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-4.74

4.74

10

9.26

Group VI-B of transition elements contains:

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Zn, Cd, Hg

Fe ,Ru ,Os

Cr, Mo ,W

Mn, Te, Re

In the manufacture of iron from haematitie,limestone is added to act as

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Flux

A reducing agent

Slag

An oxidizing agent

Orbital having same energy is called:

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Hybrid orbital.

Valence orbital.

Degenerate orbital.

D-orbital.

Lithium reacts with air to form

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Peroxide

Normal oxide

Superoxide

None of these

The acids obtained by the hydrolysis of fats and oils are called

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Active compound

Fatty acids

Functional group

None

Platinum (IV) chloride combines with ammonia to form compounds in which the coordination number of the platinum is 6. A formula unit on one of the compound contains a cation and only two chloride ions. What is the formula of this compound

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Pt(NH₃)₆CI₄

Pt(NH₃)₅CI₄

Pt(NH₃)₄CI₄

Pt(NH₃)₃CI₄

d-block elements are also called :

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alkali metal

Alkaline earth metals

Transition elements

Electron deficient elements

The chemical formula of Trona is

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KCl . MgCl₂. 6H₂O

Na₂CO₃. 2NaHCO₃. 2H₂O

Na₂CO₃. H₂O

KCl

Chlorofluorocarbon, CF₂CI₂, plays an effective role in removing O₃(ozone) in the stratosphere. Which reaction does not cause the depletion of ozone

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Which of the following is an electrophile

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Bromine

KBr

NH₃

Benzene

German silver does not contain

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Cu

Zn

Ni

Mn

The elements in which d or f-orbitals are incomplete are called

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Transition elements

Typical elements

Actinides

lanthanides

All reactions occur in :

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A single step.

A series of steps

Two steps.

Both (a) and (b)

Molecular orbital picture of N₂indicates

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One unpaired electron

Two unpaired electron

No unpaired electron

None of these

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