Question # 1

Proteins loose their ability to work

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by slight heating

by change in structure

by slight cooling

when inside the body

The elements of group I-A react violently with water and make the solution

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neutral

amphoteric

acidic

alkaline

Which of the following solid is amorphous

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NaCl

diamond

glass

MgO

Transition compounds which occur as tripositive ions have no

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4s-electron

3p-electron

3s-electron

2s-electron

NaCl is completely ionized in water due to presence of

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hydrogen bonding

dipole dipole forces

ion dipole forces

London dispersion forces

The gas which obey's the gas laws at all conditions of temperature and pressure is called:

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Perfect gas

Super gas

Ideal gas

Real gas

The molarity of 2% W/V NaOH solution is

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2

0.25

0.05

0.5

The enthalpy change AH of a process is given by the relation

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ΔΗ =ΔΕ + P∆V

ΔH=ΔE +W

ΔH =ΔΕ-ΔnRT

ΔΕ =ΔΗ + P∆V

The amount of heat required to vaporize one mole of liquid at its boiling point without change in temperature is called

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molar heat of vaporization

molar heat of sublimation

molar heat of fusion

none of these

What is the formula of cryolite?

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Al2O3.2H2O

Na2B4O7 .10 H2O

Na3AIF6

Ca2B6O11. 5H2O

Propanoic acid is functional group isomer of

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Methyl acetate

Ethyl acetate

Propanal

Proparone

1 gram formula refers to

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Amount in grams equivalent to 1 mole of a atom

Amount in grams equivalent to 1 mole of a covalent compound

Amount in grams equivalent to 1 mole of a ionic compound

Amount in grams equivalent to 1 mole of an ion

In order to maintain the boiling point of water at 110 C°, the extemal pressure should be

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550 torr

between 500 and 760 tor

between 760 and 1500 torr

any pressure can be maintained

The isomerism in which the compounds differ with respect to functional group but have same molecular formula is called

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Metamerism

Functional group isomerism

Position isomerism

Chain isomerism

Which liquid is more volatile?

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water

mercury

benzene

honey

In the equation PV = nRT which one cannot be numerically equal to R

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8.31 x 10⁷ erg⁷ K^-1 mol^-1

8.31 x 10⁷ dynes Cm K^-1 mol^-1

8.31 JK^-1 mol^-1

8.31 L atm K^-1 mol^-1

Which is the correct order of boiling points

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structure of ice

solution of ethanol in water

solution o fNaCl in benzene

linking of helix protein molecule

coordination number of N^a+ in NaC is:

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1

2

4

6

Acording to the kinetic theory of gases

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The pressure exerted by a gas is proportional to mean square velocity of the molecules

The pressure exerted by the gas is proportional to the root mean square velocity of the molecules

The root mean square velocity is inversely proportional to the temperature

The mean translational KE of the molecule is directly proportional to the absolute temperature

The conversion of molecules of A to B follows a second order kineties. Doubling the concentration of A will inerease the rate of formation of B by a factor of

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2

4

1/2

1/4

When water freezes at 0°C, its density decreases due to

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cubic structure of ice

empty spaces present in the structure of ice

change of bond lengths

change of bond angles

Equal masses of methane and oxygen are mixed in an empty container at 25∘C.

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1/3

8/9

1/9

16/17

The volume of gas depends upon the ______ molecules

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Size of

Molecular weight

Space between

Both a and b

To prepare ethane by Wurtz synthesis the suitable alkyl halide is

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Ethyl iodide

any alkyl iodide

Ethyl chloride

Methyl bromide

Carbon-Carbon double bond length in C3H6

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154 pm

134 pm

120 pm

105 pm

Ionic solids with defects,contain

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Equal number of cation and anion vacancies

Interstitial anions and anion vacanies

Cation vacancies only

Cation vacancies and interstitial cations

Collagen is a fibrous protein present most abundantly in

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heart

nucleus

connective tissues

Arteries

Which of the following is not a category of proteins based upon their function?

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genetic

Regulatory

nucleo

structural

6Na+ Fe2O3 -------- 3 Na2O+2Fe For above reaction, if you are provided with 230g Na and 320g Fe2O3, then limiting reactant is

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, Na

Na2O

Fe2O3

none of these

The amount of heat absorbed when one mole of a liquid is changed into vapours at its boiling point is called

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Heat of sublimation

Heat of vaporization

Heat of fusion

Enthalpy change

Which one the following gases is ideal at -200°C?

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N₂

He

both

none

The volume of given mass of gas is directly proportional to absolute temperature when pressure is kept constant this is called

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Boyle's law

Charles's law

Graham's law

Dalton's law

The boiling point of radon (211k)id higher than boiling point of helium (4.4k). This is due to the reason that:

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the atomic mass Rn is larger than that of He

the dispersion forces between Rn atoms are more prominent than between he atoms

rn atomic number of Rn is larger than that of He

H3O+ can't accept a Ip because

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it has positive charge

The central atom is not electron deficient

The shell of oxygen has reached its limit

it already has a coordinate bond

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

Covalent solids are composed of

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Ions

Different molecules

Neutral atoms

Diethyl ether

Enthalpy of neutralization of strong acids and strong bases have same values because

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Neutralization leads to the formation of salt and water

Acids always give rise to H+ and bases always furnish OH-

Strong acids and bases are ionic substances

The net change involves the combination of H and OH ions to form water

Which of the following metal oxides is antiferromanetic in nature?

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MnO₂

TiO₂

NO₂

CrO₂

The relationship between density and molar mass of a gas is

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Directly proportional

^{Inversly proportional}

Straight line

Stoichiometric

which chlorine compound has bonding that can be described as ionic with some convalent character?

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NaCI

MgCI₂

AICI₃

SiCI₄

In Boyle's law which of the following pair remains constant:

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Temperature and quality of a gas.

Pressure and quality of a gas.

Temperature and pressure.

Temperature and quantity of a gas.

When wine is put in air, it becomes sour due to

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Oxidation of C2H5OH

Formation of C2H5NH2

Reduction of C2H5OH

Dissolution of CO2

The strength of binding energy of transition elements depends upon

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Number of electron pairs

Number of unpaired electrons

Number of neutrons

Number of protons

Which will not react with phenol

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NaOH

Br2

KMn04/OH-

Na

Consider the following reaction
R-CHO + 2Ag(NH3)2OH + R-COONH+ +2Ag+2NH3+H2OThis reaction represents

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Fehling test

Ninhydrin test

Benedict lest

Tollen's test

In NaCl cyrstal Na⁺ion is surrounded by how many ions of Cl^-

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4

6

8

10

Which one of the following elements is the strongest reducing agent?

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Chlorine

Sodium

Magnesium

Aluminium

Liquefaction of gas can only be carried out if the:

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without caring for the value critical volume at critical stage

the temperature is more than critical and pressure is 1000 atm

the temperature is below the critical and pressure is very high

temperature is above the critical temperature and pressure can have any value

Benzene reacts with Ethyl chloride in presence of AICls to give

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Benzalchloride

Benzyl chloride

Ethyl benzene

Benzotrichloride

Surface tension is measured by

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viscometer

barometer

stalagmometer

manometer

Mostly ionic compounds are produced between elements of group

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IA and IIA

IB and VIB

IA. IIA and VII-A

IA and IB

The emf produced by galvanic cell is called

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Cell potential

Oxidation potential

Redox potential

Reduction potential

The value of general gas constant R is derived from:

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Newton's Cooling law

Maxwell's law

Avogadro's law

Charle's law

A solid has a sharp melting point slightly above room temperature and is a poor thermal and electrical conductor, its crystal classification by bond type is

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Ionic

Metallic

Molecular

Covalent

The boiling point of Kr is higher (-152.23°C) than that of helium (-268.6°C) due to

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Kr forms greater number of covalent bonds

greater polarizability of Kr than He

Kr has lowest freezing point

Kr is in liquid state at ordinary temperature

Air can be distilled fractionally because the constiltuents of the air:

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have different densities

can be liquefied

are gases at room temperature

have different boiling points

Wt. of 112 ml of oxygen at NTP on liquifaction would be

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0.32 g

0.64 g

0.16 g

0.96 g

Which one of the following will behave least like an ideal gas at high temperature and low pressure?

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hydrogen fluoride

helium

oxygen

carbon dioxide

Addition of unsymmetrical reagent to an unsymmetrical alkene is governed by

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Cannizzaro's Reaction

Aldol Condensation

Kirchhoff Rule

Markownikov's Rule

If the volume of 2 moles of an ideal gas at 540 K is 44.8 litre then its pressure will be

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1 atmosphere

2 atmosphere

3 atmosphere

4 atmosphere

Which pair of transition elements shows abnormal electronic configuration?

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Sc and Zn

Cu and Sc

Zn and Cu

Cu and Cr