Question # 1

The formation of ester from acetic aciad in presence of acid and ethanol is a

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Nucleophilic substitution reaction

Nucleophilic addition reaction

Electrophilic substituion reaction

Electrophilic addition reaction

Diffusion of different species is due to difference of

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potential energy

temperature

density

all the above

If temperature is 73K and volume is 146 cm3 then calculate the value of K=V/T

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5

4

3

2

Theoretically, the temperature at which volume of gas become equal to zero is called

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Boiling point of water

Zero absolute

Zero Kelvin

both B and C

One of the best applications of Hess's law to calculate the lattice energy of ionic compound is

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Measurement of enthalpy change in a calorimeter

Studying of first law of thermodynamics

Measurement of a heat of formation of a compound

Born-Haber cycle

1 gram molecule refers to amount in grams

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Equivalent to 1 mole of an atom

Equivalent to 1 mole of a molecule

Equivalent to 1 mole of an ionic species

Of an ionic compound

At freezing point of water, the density decreases due to

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change of bond angles

change of bond lengths

cubic structure of ice

empty spaces present in the structure of ice

Cholestryl benzoate tums into milky liquid at

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140°C

145°C

148C°

149°C

Which of the following alcohol cannot be produced by treatment of aldehydes or ketones with NaBH4

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I-propanol

2-Methyl-2-propanol

2-propanol

Ethanol

If empirical formula of a compound is CH2 and its molecular mass is 56amu. What will beits molecular formula

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CH2

C3H6

C2H4

C4H8

Volume of O₂gas at 0°C is 273 cm³, then volume of O₂gas at -10°C is

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263 cm³

163 cm³

173 cm³

73 cm³

In which one of the following does the central atom not possess an 'octet' in its outer shell?

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BH₃

CH₄

NH₃

H₂O

SiO₂ is an example of:

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metallic crystals

lonic crystals

a crystal whose structure depending upon the temperature

covalent crystals

Which is not true in case of an ideal gas?

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It cannot be converted into a liquid

There is no interaction between the molecules

All molecules of the gas move with same speed

At a given temperature P'V is proportional to the amount of the gas

Covalent bonds are least likely to be formed:

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between atoms of the same element

between atoms of different elements on the right of the periodic table

by head of the group elements with high ionization energies

between an element in Group I and an element in Group Vll

Vapour pressure of a liquid

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increasing with increase of temperature

increases with decrease of temperature

increases with size of container

increases with volume of liquid

Dehydrohalogenation of alkyl halides happens in the presence of

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Pd

Ni

Zn

KOH/alcohol

Ethylene polymerizes at 100 atm pressure and 400 °C to give

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Polybenzene

Polypropylene

Polyalcohol

Polyethylene

Aluminium is in Group lll, its oxide will have the formula.

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AlO

AlO₂

Al₂O₃

Al₃O₂

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

Which of the following alcohols is least reactive with respect to 0-H bond

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CH3OH

CH-CH2-OH

(CH3)2-CH-OH

(CH3)3OH

The strength of dipole-dipole forces depends upon

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Electro negativity difference

Distance between atoms

Electropositivity difference

Both A & B

L-asparginase is helpful in treatment of

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skin disease

blood cancer

heart failure

obstructive jaundice

When two ice cubes are pressed together they unite to form one cube. Which of the following forces is responsibles for holding them together

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Van der Waal's

covalent bonding

hydrogen bonding

dipole-dipole interaction

The minimum temperature recorded by Kelvin scale is:

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273K

373K

Absolute scale is unable

0K to record this temperature

An ideal gas cannot be liquefied because

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Its critical temperature is always above 0°C

Its molecules are relatively small in size

It solidifies before becoming a liquid

Forces operative between its molecules are negligible.

Absolute zero is equal to:

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-273.15K

-273.15^oC

-237.15K

-273 ^oC

which of the following is a typical transition metal?

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Sc

Y

Ra

Co

Stronger the oxidizing agent, higher is

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Redox potential

Standard reduction potential

Reduction potential

_{Oxidation potemial}

NH³ shows a maximum boiling point among the hydrides of V-A group elements due to :

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very small size of nitrogen

lone pair of electrons present on nitrogen

enhanced electronegative character of nitrogen

pyramidal structure of NH³

The number of moles of H2 in 0.224 L of hydrogen gas at STP (273 K, 1 atm) assuming ideal gas behaviour is

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1

0.1

0.01

0.001

The volume of 2.8 g of carbon monoxide at 27°C and 0.821 atm pressure is (R = 0.0821 lit.atm.Mol^-1 K^-1)

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30 L

3 L

0.3 L

1.5 L

Dalton's law finds its application during the process of:

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Digestion

Respiration

Reproduction

All of above

The existing property of an element in to more than are crystalline state is termed as:

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isomorphism

polymorphism

isotropy

allotropy

Which is the incorrect value of gas constant R?

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2.987 cal k^-1 mol ^-1

3.313 Nmk^-1 mol^-1

62400dm³ atm k^-1 mol^-1

1.10821atm dm3k^-1 mol^-1

Which one of the following is not associated with SN2 mechanism

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100 % inversion of configuration

Tertiar alkyI halides

2nd order kinetics

Change of hy bridization from sp³ to sp² in transition state

How should the conditions be changed to prevent the volume of a given gas from expanding when its mass increased?

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temperature and pressure both ara increased

temperature and pressure both are lowered

temperature is lowered and pressure is increased

temperature is increased and pressure is descreased

The crystal system are of

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7 types

10 types

5 types

8 types

Among the following molecules, which one has coordinate covalent (dative) bond?

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CCI4

CO2

CO

CH4

Ionic solids are characterized by

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low melting points

good conductivity in solid state

high vapour pressure

solubility in polar solvents

Which order of vapour pressure in the following liquids is correct

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water > ethanol > acetone > ether

ether > acetone > ethanol > water

ether > ethanol > acetone > water

water > ether > acetone > ethanol

The instrument that is used to measure the pressure of a gas is called

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viscometer

photometer

barometer

stalagmometer

Amorphous means

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arranged

ordered

shaped

shapeles (no arrangements)

London dispersion forces are also called

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Ion-dipole forces

Dipole-induced dipole forces

Dipole-dipole forces

Instantaneous dipole induced dipole forces

Solids in which atoms, ions or molecules are not regularly arranged are

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crystalline solid

amorphous solids

liquid crystals

low melting points

C-H bond length in the benzene is

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0.99A°

1.09A°

1.12A°

1.34A°

Formalin is used as:

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Fungicide

Germicide

Sterilizing of surgical instruments

All three

Which of the following has isomorphous structure with MgO

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NaF

S

Sn

N

Which of the following reactions does not involve formation of carbocation?

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SN1 and E1

El and E2

SN1 and SN2

E2 and SN2

Tertiary alcohols are the easiest to dehydrate because

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They form stable carbocation

They have less hydrogen

They have bigger size

They are polar

In graphite crystal, carbon is

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sp hybridized

sp²hybridized

sp³hybridized

None

The polarizabilities of elements mostly increase down the group due to the reason that

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the atomic numbers increase

number of protons increase

number of shells increase along with increase of shielding effect

the behaviour of the elements remain the same

The synthesis of ethene from ethyl alcohol is a reaction

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Dehydration

Polymerization

Addition

Substitution

In a crystal the atoms are locate at the position of:

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infinite potential energy

minimum potential energy

Zero potential energy

maximum potential

Diamond is a bad conductor of electricity because:

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it has a tight structure

it has a high density

there are no free electrons

none of the above

In order to mention boiling point of water at 110∘C the external pressure should be:-

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between 760 torar an 1200 torr

between 200 torr and 760 torr

765 torr

any value of preessure

What is not correct about ∆HF

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It is always negative

Ìts value gives an idea about the relative stability of reactants and the products.

Its value can be greater or less than zero

Value depends upon nature of bonds

One molecule of gas is approximately Distance______ times its own diameter from its neighbour at room temperature.

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30

3000

3

300

If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of the gas will:

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reduced to 1/4

be double

increases four times

remains unchanged

Which is not mineral of AI?

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Diaspore

Corrundam

Bauxite

Galena

Whenever a reaction is endothermic, then it means that

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Heat is transferred system to the surrounding

Heat is transferred from surrounding to the system

Heat content of the products is less than that of reactants

Heat content of the reactants is greater than the products