Question # 1

Which pair of elements will have the same type of bonds between their atoms in the solid state?

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carbon and calcium

lithium and boron

aluminium and phosphorus

nitrogen and carbon

pi-bond can be formed by sideways overlap of

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s-orbital

d-orbital

p-orbital

sp orbital

NH₃shows maximum boiling among the hydrides of group V elements. The is due to:

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pyramidal structure of NH₃

H-bonding between its molecules

enhanced electronegative character

very small size of nitrogen

Which one of the following reaction of carboxylic acid is reversible?

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Esterification

Salt formation

Reaction with PCI5

Reaction with SOCI2

Which one is very weak acid

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HF

HCI

H2CO3

H2O

At same temperature which substance has high kinetic energy:

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Liquid water

N₂gas in a container

Solid piece of iron

Solution of alcohol and water

Gases exert pressure on walls of container because the gas molecules:

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Obey gas laws.

Have definite volume.

Collide with the walls of container.

Collide with each other.

K2SO4, and K2Cr2O4, are isomorphous solids and exist in

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cubic form

orthorhombic form

trigonal form

tetragonal

Which is the following would have most like an ideal gas at room temperature?

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carbon dioxide

helium

hydrogen

nitrogen

At equilibrium rate of evaporation and rate of condensation

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Become very high

Become very low

Become equal

Can never be equal

Which of the following molecules have a permanent dipole

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CH₄

CHCl₃

CCl₄

CO₂

There is more deviation in the behaviour of a gas from the ideal gas equation PV = nRT

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At high temperature and low pressure

At low temperature and high pressure

At high temperature and high pressure

At low temperature and low pressure

An electron with drawing group attached to e-position in phenol

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makes it basic

Stabilises the phenoxide ion

decreases its basicity

allows it to precipitate in aqueous solution

A basic buffer solution can be prepared by mixing

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Strong acid and its salt with weak base

Weak base and its salt with strong acid

Strong base and its salt with weak acid

Weak acid and its salt with strong base

NaNO₃and CaCO₃crystals are Rhombohedral isomrophism is due to

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both soluble in water

their cations belong to S block element

same shape of NO₃^-1and CO₃^-2ions which is triangular planar

same number of O atoms

The spreading of ink on blotting paper is due to

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capillary action

hydrogen bonding

intermolecular forces of the ink

intermolecular forces of the ink and paper

The electrolyte used in fuel cell is

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КOH

NaCl(aq)

NaNO3

Molten NaCl

For N2: +3H2<--------> 2NH3, if Kc is 1 than value of Kp at 273K would be

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1/22.414

1/(22.414)2

22.414

11.207

Elements of II-A group are called alkaline earth metals due to the reason that

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they occur in earth only

they form divalent cations only

they have ns2 electronic configuration

their oxides and hydroxides are alkaline in nature and metals are present in earth crust

An example of bydrolase is

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Amylase

Lipase

Fumarase

A,C

What is the formula of clay?

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Asbestos

Talc

H2Al2(SiO4)2.H2O

Na2SiO3

Compound X & Y give effervesce with Na2CO3, solution. X gives a white ppt with ammonical AgNO3 while Y gives sweet smell compound on heating with alcohol X &Y are

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Formic acid & acetic acid

Acetone & formic acid

Acetaldehy de & acetic acid

Acetic acid & acetone

H-bonding is maximum in:

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ethanol

benzene

diethyl ether

water

The enthalpy of formation of a compound is

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Positive

Either positive or negative

Negative

None

Which element is expected to show the greatest tendency to form some covalent compounds?

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aluminium

calcium

magnesium

sodium

One of the following metals is the most reactive and form super oxide. Indicate that

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Mg

K

Be

Li

The ratio of diffusion of equal volume of He and SO₂is (molecular mass He = 4, SO₂= 64):

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1:4

16:1

1:16

4:1

In the transition state of S2 mechanism reaction with alkyl halides, which of the following orbital hybridization is involved

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sp³

sp

sp²

dsp³

The boiling of water may be 120°C, when the external pressure is

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greater than 760 torr

less than 760 torr

equal to 760 torr

variable

Identify the compound, which give iodoform test

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Methanol

3- Hexanol

Methyl ketone

Propionaldehyde

Water may boil at 170C when external pressure is

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760 torr

170 torr

2115 torr

700 torr

For formation of ionic bond, electronegativity difference should be

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Equal to zero

Equal to 0.5

More then 1.7

Less than 1.7

The element which shows highest binding energy

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V

T

So

Cr

Acetone and chloroform are soluble in each other due to:

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intermolecular hydrogen bonding

dipole-dipole interaction

instantaneous dipoles

all of the above

What is the formula of silica?

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Si2O3

SiO2

Si3O4

SiO-

In the reaction A2 (g) + 4B2 (g) <-----------> 2AB4 (g) such that ∆H < 0, the formation of AB4(g) will be favoured at

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Low temperature and high pressure

Low temperature and low pressure

High temperature and low pressure

High temperature and high pressure

The minimum temperature recorded by Kelvin scale is:

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273K

373K

Absolute scale is unable

0K to record this temperature

A covalent bond may be

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100% covalent

Partial ionic

100% ionic

Both a and b

How many allotropic forms are present in carbon?

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Two

Four

Three

Five

Propanoic acid is functional group isomer of

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Methyl acetate

Ethyl acetate

Propanal

Proparone

Pressure remaining constant, at which temperature the volume of a gas will become twice of what it is at 0°C

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546°C

200°C

546 K

273 K

Name the compound, which shows geometric isomerism

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I-bromo-2-chloropropene

2.3-dimethy lpropene

2-pentene

Both A & B

Which of the following configurations corresponds to alkaline earth metals?

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[Ar] 3d10, 4s2

[Ne] 3d2, 3p2

[Ar] 4s2

[Ar], 3d10, 4s1

Stronger the intermolecular forces

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Lower the Vapour pressure

Greater the Vapour pressure

May be smaller or greater

None

which of the following is not a symmetrical ketone

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4-heptanone

Butanone

Propanone

3-pentanone

Gases are effused through a whole due to ______ motion

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Vibration

Rotaional

Translational

Chaotic

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

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neutral

amphoteric

acidic

alkaline

Which attractive forces cause molecular solids to be formed?

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lonic

Metallic

Covalent

van der Waals

Acetic acid reacts with thionyl chloride to form acetyl chloride, which species acts as nucleophile in the reaction

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SO3

SO2

Cl-

No nucleophile is formed

What will be the shape of a molecule which containstwo sigma bond pairs and one lone pair?

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Linear

V shape

Tetragonal

Triangular

The structural isomerism arises due to the difference in the

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Number of atoms in the molecule

Arrangements of atoms in the molecule

Number as well as arrangement of atoms in the molecule

Spatial arrangement of atoms

The smallest unit of a crystal that shows all the characteristic properties of its pattern is called

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cell

electrolyte

unit cell

crystal

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

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

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Polybenzene

Polypropylene

Polyalcohol

Polyethylene

Which one of the following pair of atoms is most likely to form an inoic bond?

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Na and F

C and F

N and F

O and F

Kinetic energy of one mole of an ideal gas at 300 K in kJ is

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34.8

3.48

3.74

348

The solubility of A2B3 is X mole dm-3. Its Ksp is?

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6X(5)

36X(5)

64X(5)

108X(5)

If the four tubes of a car are filled to the same pressure with N₂, O₂, H₂ and helium separately,then which one will be filled first.

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N₂

O₂

H₂

He

Which of the following gases shows more ideal behaviour at 0°C

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H₂

CH₄

He

NH₃

If V₁= 5 litters, P₁= 2 atm, T₁= 273°C, T₂= 0°C and V₂= ? When P₂= 1 atm.

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5 lit

10 lit

2.5 lit

12.5 lit

Which compound gives carbon when heated with conc. H2SO4.

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Starch

Ethyl alcohol

Oxalic acid

Formic acid