Question # 1

Which of the following are thermoplastic materials

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PVC

Polystyrenes

Polyethylene

All these

Number of elements in the first period of the periodic table are

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Two

Four

One

Eight

Violet colour is obtained when dilute CuSO₄is added in alkaline solution of protein. This test is known as

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Biuret

Xanthoproteic test

Hopkins-cole

All of these

Aldehydes are reduced to :

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Pri-alcohol

Sec-alcohol

Ter-alcohol

All of these

Which substances haveΔH =ΔE

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Solids

Liquids

Gases

Liquids and solids

The diameter of atoms is of the order:

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2* 10^-5m

2* 10^-10m

2* 10^-2m

2* 10^-3m

The heat of formation of graphite and P(white) is ______ KJ/mole

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0.00

-273.0

+8.7

813.99

The oxidation number of each element of group ll-A is

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0

+1

+2

-1

Which property is not present in lipids?

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Liquid

Solid or semi solid

Soluble in water

Form emultion

A system undergoes a change to attain the state of

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High energy

Low energy

Moderate energy

None of these

Formic Acid is obtained from Red out by:

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Distillation

Crystallization

Filtration

sublimation

The solution of which acid is use for seasoning of food?

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Formic acid

Acetic acid

Benzoin acid

Butanoic acid

The Total coal resources of Pakistan are estimated to be

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184 billion

184 million tones

1.84 billion tounes

1.84 million tonnes

Which period starts from ₁₁Sc to ₃₀Zn ?

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First Period

Second Period

Third Period

4th Period

Which one of the following is a product of the reaction between C₆H₅CH₂OH and CH₃COCI

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C₆H₅OCOCH₃

C₆H₅CH₂CI

C₆H₅CH₂OCOCH₃

C₆H₅CH₂COCI

The weight of pure NaOH required to prepare 250 cm³of 0.1 N solution is

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4 g

1 g

2 g

5 g

Self linkage of carbon to produce long chains

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isomerism

Polymorphism

Polymerization

Catenation

Catenation is a process in which carbon shows the properties of making

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Multiple bonds

Hybridization

Long chains or rings of carbon atom

Showing isomerism

The molecule of ethane possess which hybrization

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sp³

sp²

sp

sp²d

The energy of ionization of an atom is the energy difference between orbital

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The heat contents of all the elements in their standard states are taken to be

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1

2

0

None

Which of the following in an example of reversible reaction

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Equal volumes of N₂and H₂are reacting

Equal masses of N₂and H₂are reacting

The reaction has stopped

The same amount of ammonia is formed as is decomposed into N₂and H₂

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2-bromonitrobenzene

2-nitrobromobenzene

1-bromonitrobenzene

1-nitrobromobenzene

The degenerate orbitals p-sub shell are

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2

3

5

7

In Lucas test primary alcohol make as oily layer

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Immediately

In 10 mins

On heating

Not

Vegetable oils are

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Unsaturated fatty acids

Glycerides of unsaturated fatty acids

Glycerides of saturated fatty acids

Essential oils obtained from plants

The reaction of sodium with ethanol gives

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CH₃OH

NaH

H₂O

H₂

Which of the following statement is incorrect about SHE(Standard hydrogen electrode):

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Reduction potential of Cu⁺² is smaller than H⁺ions whenit is coupled with copper electrode.

gas is passed in it at 1 atm pressure.

Its oxidation potential and reduction potential is zero.

It is made of platinum wire dipped in HCl solution

The divisibility of atom was shown by

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Stoney

J.J. Thomson

Millikan

Rutherford

A limiting reactant is one which according to the stoichiometric equation

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Has excess mass

Has least mass

Has excess number of moles

Has least number of moles

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