Question # 1

Which element has highest electronegativity?

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CI

F

Br

I

Silver is a ____________ metal.

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Pure

Noble

None

All

Every system in the universe tends to lower its energy to attain ________________

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Freedom

Flow

Stability

Nil

The No. of atoms in 1 mole of carbiton is

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6.02 x 1021

6.02 x 1022

6.02 x 1023

6.02 x 1024

The cathode of Daniel cell is made up of

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Zn

Cu

AI

C

How many time liquids are denser than gases?

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100 times

1000 times

10,000 times

100,000 times

The forces of attraction present between the molecules of a substance are called ____________ forces.

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Intermolecular forces

Covalent

Ionic

Nil

When an electronegative element combines electropositive element the type of bonding is

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covalent

ionic

polar covalent

coordinate covalent

The no.of neutrons in deutrium is

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1

2

3

4

The branch of chemistry which deals with qualitative & quantitative analysis of matter is :

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Analytical

Nuclear

Biochemistry

Organic

The solubility of which salt increases in heating?

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Li₂SO₄

Ce₂(SO₄)₃

NaCI

KCI

Benzene is formed by the polymerization of.

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Alkene

Alkane

Acetylene

Methane.

Which gas is in involved in ozone depletion?

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Nitrogen

CFC's

Chlorine

All of them

Which disease cause when humans use water of industrial effuents.

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Cancer

Asthma

Jaundica

Cholera

Our planet earth consists of ____________ natural Spheres.

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1

4

6

8

In which one of the following is a substitution reaction?

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Halogenations of alkynes

Halogenations of alkenes

Halogenations of alkanes

Bromination of alkenes

The value of constant of ionic product of water Kw at 25 C.

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1.0 x 10^-4

1.0 x 10¹⁴

1.0 x 10^-4

1.0 x 10⁴

Which one gas is liberated when alkalies react with ammonium salts?

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O₂

CO₂

H₂

NH3

Oils and fats are esters of large chain fatty acids with.

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Glycogen

Glucose

Starch

Glycerol

At the time of partition, How many industries wee present in Pakistan.

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30

32

34

40

Carbon monoxide is harmful to use because it:

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Paralyses lungs

Damages lungs

Reduce oxygen carrying ability of hemoglobin

Make the blood coagulate

Industrial effluents are highly

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Toxic organic compounds.

Inorganic salts.

Heavy metals

All of them

Molal boiling constant for water is 0.52 ^oC. If 6 g of urea is dissolved in 100 g of water, what will be its boiling point.

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100.52 ^oC

-100.52^oC

100^oC

99^oC

Which particle have greater wave nature.

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Electron

Proton

Neutron

a particles

Azeotropic mixture can be separated into pure components by

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Distillation

Fractional distillation

Vacuum distillation

None

Which one of the following substances is not amorphous

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Polymer

Rubber

Glass

AgNO₃

The concept of distribution of velocities among the gas molecules was given by.

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Clausius

Mexwell

Boltzmann

Vander waal

Crystal to diamond is.

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Ionic

Molecular

Covalent

Metallic

The deviation of a gas from ideal behaviour is maximum at.

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-10 ^oC and 5.0 atm

-10 ^oC and 2.0 atm

100 ^oC and 2.0 atm

0 ^oC and 2.0 atm

Actual yield is mostly less than the theoretical yield due to the reason that

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Rates of reactions are slow

Loss of the product during handling

Reactions are never completed 100%

Law of conservation of mass is not true

Which of the following is true for ionic compounds

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They are non-electrolytes in the molten state

They have bonds which are directional

They conduct electricity in solid state

They are generally more soluble in polar solvents than in non-polar solvents

Azeotropic mixture

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Obey Raoult's law

Do not obey Raoult's law

Boils at low temperature only

Boils at high temperature only

The atomis radius is of the order of

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10^-8cm

10⁸cm

10^-12cm

10^-10cm

What is effect of solubility of carboxylic acid in water by increasing their molecular masses.

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Decreases

Increase

Remain constant

Non effected

------------------- is not a nucleophile

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H₂O

NO₃

BF₃

NH₃

Acetone reacts with HCN to form cyanohydrin it is an example of

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic subtitution

Which of the following derivative connot be prepared directly from acetic acid.

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Acetamide

Acetyl chloride

Acetic anhydride

Ethyl acetate

Which is not used of Borax

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Softening of water

As medicine for washing eyes

As flux in metallurgical operations

To make quartz

Which woody raw material is used for the manufacture of paper pulp

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Cotton

Biogases

Rice straw

Poplar

Usually the percentage of moisture is paper is

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1- 3%

4-6%

6-8%

5%

Which one of the following is not a heterocyclic compound.

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Furan

Thiophene

Pyridine

Aniline

Vinyl chloride when boiled with alcoholic KOH , gives

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Acetylene

Ethylene

Ethene

Ethyl alcohol

The general formula for Alkanes is

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C_nH_2n+1

C_nH_2n

C_nH_2n-2

C_nH_2n+2

Which one of the following is not an alkali metal.

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Francium

Cesium

Rubidium

Radium