Question # 1

When we mvoe from left to right in a period, ionization energy.

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No effect

Decreases

Increases

None of these

All metals bear

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Positive charge

Negative charge

Both a and b

None of these

d- subshell can accommodate maximum electrons.

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2

6

10

14

The word energy is used in physics ofr the firt time.

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1902

1858

1805

1802

Whcih Isotopes is used for diagonosis of goiter?

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Iodine-131

Cobalt -60

P-32

Sr-90

Which branch of chemistry is athe study elements and their compounds except for organic compounds?

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Physical Chemistry

Geochemisty

Organic chemistry

Inorganic chemistry

How many periods are present in the modern periodic table

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7

8

10

12

The haviest metal is

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Iron

Lead

Osmium

Platinum

The batteries in our vehicles are bilt on the principl of electronchemistry It is the application.

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Astrochemistry

Physical chemistry

Analyticla chemistry

Organic chemistry

Bond dissocialation for H2 is

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435 kJ/mol

440 kJ/mol

430 kJ/mol

445 kJ/mol

17th group elements ae known as

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Alkaki metals

Alkaline earth metals

Noble gases

Halogens

Empirical formula of acetic acid (CH3COOH) is

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CHO

CH

CH2O

None of these

In an irrversibel reaction equilibrium

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Never establised

Established quickly

Established slowly

Established when reaction stops

Which of the following cannot be classified as Arrhenius acid

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CO2

HNO3

H2CO3

H2SO4

Concentratin of reactants and product at equilibrium remains unchanged if

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Concentration of any reactant or product is not changed

Temperaure of the reation is not changed

Pressure or volume of the system is not changed

All of the above are observed

Natural gas is 85% methane, It is used to make the follwing except.

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Carbon black

Ethane

Propane

Both b and c

Which are responsible for transmitting genetic information form generation to generation:

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vitamins

lipids

proteins

Nucleic acids

The reaction will attain the equilibrium if:

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Qc<Kc

Qc > Kc

Qc = Kc

Qc = 0

In an irreversible reaction dynamic equilibrium:

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Never establishes

Established before the completion of reaction

Establishes after the completion of reaction

Establishes readily

Lewis acid-base concept have the following characteristics except:

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formation of an adduct

Formation of a co-ordinate covalent bound

Donation and acceptance of an electron pair

Donation and acceptance of a proton

Which one of the following ion does not cause hardness in water?

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Ca⁺²

Mg^-2

SO^-2

Na⁺

Which gas in produced during ripening of bnabanas.

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Methane

Ethene

Acetylene

Carbon dioxide

At dynamic equilibrium:

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The reactions stops to proceed

The amounts of reactants and products are equal

The speed of the forward is reverse reactions are equal

The reaction can no longer be reversed

Which one of the following diseases severe diarrhea and can be fatal?

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Joundice

Cholera

Dysentery

Typhoid

A pollutant is a waste material that pollutes.

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Air

Water

Soil

All of them

Which pollutant is not found in car exhaust gases?

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CO

O₃

NO₂

SO₃

Which one contains triple covalent bond?

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Pentane

Ethylene

Acetylene

All

Lavoisier named binary compounds of oxygen acids in .

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1787

1790

1815

1828

At equilibrium state there are possibilities: OR types of chemical equilibrium are.

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1

2

3

4

The residual oil is heated above 400 c to produce.

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Lubricants

Paraffin wax

Asphalt

All

The unit of rate constant is the same as that of the rate of reaction is.

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First order reaction

Second order reaction

Zero order reaction

Third order reaction

The shielding effect of the inner electrons is responsible for

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Increasing ionization energy values

Decreasing ionization energy values

Increasing electron affinity

Increasing electonegativity

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Fe is reduced

Fe is oxidized

CI₂is oxidized

None of these

The bond order of N2 molecule is.

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1

2

3

4

a zero order reaction is one is which

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Reactants do not react

One reactant is in large excess

Concentration of reactant do not change with passage of time

Rate is of affected by changing concentration of reactants

Calorie is equivalent to

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0.4184 J

41.84 J

4.184 J

418.4 J

The relationship between K_pand K_cis given by

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The element nickel has isotopes.

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3

2

5

7

In triclinic unit cell

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All axial lengths are equal

All internals lengths and angles are equal

Both axial lengths and angles are equal

Both axial lengths and angles are unequal

The substance which decrease the activity of a catalyst is called.

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Promoter

Activator

Inhibitor

Positive catalyst

Which of the following statements is not correct regarding bonding molecular orbitals

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Bonding molecular orbitals possess less energy than atomic orbitals from which they are formed

Bonding molecular orbitals have low electron density between the two nuclei

Every electron in the bonding molecular orbitals contributes to the attraction between atoms

Bonding molecular orbitals are formed when the electron waves undergo constructive interference

Many element have fractional atomic masses. This is because.

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the mass of the atom is itself fractional

Atomic masses are average mases of Isobars

Atomic masses are average masses Isotopes

Atomic masses are average masses of Isotopes proportional to their relative abundance.

The paramagnetic behaviour of oxygen is well explaned on the basis of.

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M.O Theory

N.B Theory

VSEPR Theory

CF theory

The change in heat energy of a chemical reaction at constant temperature and pressure is called.

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Enthalpy change

Bond energy

Heat of sublimation

Internal energy change

The molal boiling point constant is the ration of the elevation in boiling point to

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Molarity

Molality

Mole fraction of solvent

Mole fraction of solute

The chemical composition of pyrolusite is.

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KMnO4

K2MnO4

MnO2

MnO

Which process of pulp making is mostly used in Pakistan.

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Kraft process

Sulphite process

Neutral sulphite semi chemical process

Wet process

The state of hybridization of "C" in ethane is

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SP

sp²

dsp²

sp³

In [Co(NH3)6]+3 the coordination number of cobalt is.

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Zero

Two

Four

Six

The colloidal particles in raw water can be removed by

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Coagulation

Aeration

Chlorination

Hydration

When ethyl alcohol is heated, with NH3 in presence of ThO2 then

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O-H bond is broken

C-O bond is broken

Ethene is formed

Ethane is formed

The type of hybridization in PCl3 is.

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dsp2

sp3

dsp3

d2sp3

The oligosaccharides contain number of hexose unit.

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2 to 7

2 to 8

2 to 9

2 to 100

Which one is not property or uses of mustard gas

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Used in 1st world war

Powerful vesicant

High boiling liquid

High boiling gas

Which substance shows very weak hydrogen bonding with water.

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Methanol

Ethanol

Diethyl ether

Benzene

Cyclic structure of benzene was proposed by

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Dewar

Faraday

Down

Kekule

The composition of oleum is.

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H2SO4

H2S2O3

H2S2O7

H2S3O7

Vinyl acetlylene reach with HCl to form

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Polycetylene

Benzene

Chloroprene

Divinylacetylene

SN2 reactions can be best carried out with

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Primary alkyl halides

Secondary alkyl halides

Tertiary alkyl halides

All the three

Disinfection of water by chlorine is done by the production of.

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NH2Cl

NCl2

HOCl

NHCl2