Question # 1

Which is the polymer that has amide linkage in its structure

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PVC

Poly ethene

Polyester

Nylon

At STP,a container has 1 mole of Ar,2 moles of CO₂,3 moles of O₂ and 4 moles of N₂.Without changing the total pressure if one mole of O₂ is removed,the partial pressure of O₂

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Is changed by about 26%

Is halved

Is unchanged

Change by 33%

Lithosphere has amount of silicon:

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35.30%

27.72%

40.01%

21.13%

2-propanol on Oxidation gives

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Aldehyde

Carboxylic Acid

Ketone

Alcohol

The structure of sodium chloride is

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simple cube

body centered cubic

face centered cubic

depends upon conditions

The mono atomic gas molecules are ______ gas molecules

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Halogen

Zero

Noble

Both b and c

Which of the following factors does not affect the SN1 rate is

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Nucleophilicity of the attacking nucleophile

Stability of the carbonium ion

Solvent system

The nature of leaving group

The value of the vapour pressure of water at its boiling point at Karachi and Murree is

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same

different

depends upon the environmental conditions in both cities

greater at Murree and less at Karachi

The measurement of enthalpy change at standard conditions means that we should manage the measurement at

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24°C at 1 atm

25°C at 1 atm

0C° at 1 atm

100C° 1 atm

Which one of the following has the lowest pH values

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0.1 M HCI

0.01 M HCl

0.1 M KOH

0.01 M KOH

Acid rain is caused when various atmospheric gases dissolve in rain water. What are the gases that cause rain water

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SO₂

NO₂

CO

a and b only

[Cu[NH₃)₄]⁺²will form ______ structure

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Square planar

Tetrahedral

Octahedral

Trigonal bipyramidal

An artificial smell of banana is produced in many articles y using esters which of the following is that

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Amyl acetate

Isoamyl valerate

Octyl acetate

Methyl butyrate

Homologues differ from each other by an integral number of

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CH₂groups

CH₃groups

CH groups

CH₄groups

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Shift reaction toward forward direction

Shift reaction backward

Lower the value of K_c

No change in reaction

When CO₂is made to react with ethyl megnesium iodine, followed by hydrolysis, the product formed is:

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Propane

Propanoic acid

Propanal

Propanol

The bond order for He₂molecule is

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zero

1/2

1

2

CsF is an ionic compound because:

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High I.P of Cs and high E.A of F.

High I.P of Cs and low E.A of F.

Low I.P of Cs and high E.A of F.

Low I.P of Cs and low E.A of F.

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RCH(CH₃)CO₂H + CH₃OH

RCH(CH₃)CO₂H + HCO₂H

RCH(CH₃)OH + CO₂

RCH(CH₃)OH + HCO₂H

Cyclohexane can be converted not benzene in the presence of

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Pt at 100°C

Pt at 250°C

Pd at room temperature

Pt at room temperature

In a period, melting points of elements

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Increases

Decreases

Remain constant

First increases then decreases

Cracking normally gives smaller ______

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Alkanes

Alkenes

Alkynes

Both a and b

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