Question # 1

Phenol can be diatingushed from ethyl alcohol by all of the following reagents except

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lodoforrn test

Na

Br2 /H2O

NaOH

The compound that has zero dipole moment is

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HCl

H₂S

NH₃

CH₄

Stronger the intermolecular forces

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Lower the Vapour pressure

Greater the Vapour pressure

May be smaller or greater

None

Dipole-dipole interaction are present in the

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atoms of the He gas

molecules of CCl4

molecules of solid iodine

molecules of :NH3

The crystal of K₂SO₄and K₂CrO₄are orthorhombic. These are isomrophs due to

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same physical properties

their cations identical

number of O atms is equal

same shape of SO₄^-2and CrO₄^-2tetrahedral

Which of the following has no hydrogen-bonding

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Diethyl ether

Water

Ethyl alcohol

Phenol

Paramagnetic behaviour is caused by the presence of

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Unpaired electrons

Paired electrons

Paired protons

Paired electrons in an atom. molecule or ion

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

ΔH° represent the enthalpy change at

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0°C and 1 atm pressure

25°Cand 1atm

0K and I atm pressure

25°C and 2 atm pressure

What is not true for NH4CI

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It has ionic bond

It has covalent bond

It has coordinate bond

It has hydrogen bond

Aniline is the derivative of the benzene containing the

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Hydroxyl group

Amino group

Amido group

Imido group

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

The pH of ideal buffer is

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10

7

Less than 7

0

The crystal of diamond is

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ionic

molecular

covalent

metallic

Hydration of ethene is an example of

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

One atmosphere is equal ___________ Pascal

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760

101325

14.7

1.01325

Which of the following is a pseudo solid?

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CaF₂

glass

NaCl

all these

In dilatometric method is directly proportional to extent of reaction

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Change in concentration

Change in pressure

Chang in volume

Change in temperature

The number of Cl- ions per unit cell of NaCl are

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6

4

2

8

Naturally occurring isotopes of silver are

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,Two

, Four

, Forty seven

, sixteen

Primany aleohols sornally give us aldehyde when oxidized in the presence of acidified Na2Cr2O7, what will be the product, when the secondary alcohols are oxidized in same condition?

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Alkenes

Alkyl halide

Alkynes

Ketones

Formula of sodium beryllite is

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Na2B4O7

Na2BeO2

BeONa

Na2B4O7 .10 H2O

The motion imparted to the gas molecules by gravity is

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very small

very large

negligible

appreciable

A term to express the partial pressure of water vapours in a gas is known as

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vapour pressure

aqueous tension

partial pressure

moisture

The material possessing superconducting properties is

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Yb Ba₂ Cu₂ O₈

Hg Be₂ Ca₂ Cu₂ O₈

Y Ba₂ Cu₃ O₇

Y B₂ Cu₃ O₇

The synthesis of ethene from ethyl alcohol is a reaction

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Dehydration

Polymerization

Addition

Substitution

NH₃can form only one hydrogen bond per molecule though it has three partially positively charged hydrogens

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nitrogen in NH₃has only one ions pair of electrons which can make one H-bond

ammonia is a base

ammonia is a weak acid

it ionizes to give one H⁺

The molecules of CO2, in dry ice form the

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covalent crystals

molecular crystals

none of these crystals

ionic crystals

The strongest conjugate base is

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OH-

CH3O-

C6H5O-

CH3COO-

The shielding effect of inner electron is responsible for

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Having no effect on ionization energy

Decreasing ionization energy

Increasing ionization energy

Increasing electronegativity

Gases are good conductor of electricity at

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Low temperature

Low pressure

High pressure

Low temperature and high pressure

Ethanol reacts with sodium metal to liberate

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CO2 gas

CO gas

H2 gas

Steam

Most of the universe consists of the matter in :

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Gaseous state

Liquid state

Plazma state

Solid state

Saturated hydrocarbons having carbon atoms more than 20 in a molecule are solids due to

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higher densities

higher molar masses

the chain, are more zig-zag

all are correct

When a metal rod is dipped in its one molar ionie solution

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Electricity is produced

Electricity is consumed

Redox reaction occurs

Potential difference is set up

Substituted phenyl group are called

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Arene groups

Alkyl groups

Aryl groups

Acyl groups

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

Anthracene contains number of fused benzene rings

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1

2

3

4

SHE acts as anode when connected with Cu electrode but act as cathode with Zn electrode

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Zn has less reduction potential than hydrogen and Cu

Zn has high reductionl potential than hydrogen

and Cu

Zn is below electrochemical series than hydrogen and Cu

Zn has least tendency to lose electron

One dm³of O₂at STP has mass

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32 g

16 g

4.438 g

1.4383 g

Hess's law is analogous to

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Law of heat summation

law of increasing entropy

Law of heat exchange

Ist law of thermodynamics

Which of the following is not heterocyclic compound?

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Naphthalene

Furan

Pyridine

Pyrrole

Born-Haber cycle is an application of

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Hess's law

1" law of thermodynamics

Avogadro's law

1law of thermochemistry

Reaction of alcohol with hydrogen chloride, in the presence of Zinc chloride yields

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Ketone

Carboxylic

Alkyl halide

Ester

Pressure of 1Nm^-2 is equal to

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One bar

1 psi

One pascal

One atmosphere

NaCI is completely ionized in water due to the presence of:

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dipole-dipole forces

ion- dipole forces

H-bonding

London dispersimforces

Diamond and graphite are

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isomorphous

polymorphous

allotropes

none of these

Lind's ,method for liquefaction of gases is based on the principle of:

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Graham's law of diffusion

Joule Thomson effect

Avogadro's hypothesis

Dalton's law of partial pressure

Kerosene is liquid at room temperature.This is due to:

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organic nature

H-bonding

molecular size

dipole-dipole forces

Which liquid is more volatile?

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water

mercury

benzene

honey

One statement of isomorphism is incorrect

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they have different chemical properties

they have same physical properties

they have same atomic ratio

they have definite geometric shape

Change in enthalpy (∆H) of a system can be calculated by

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∆H=∆E - PV

ΔH =ΔE +q

∆H = ∆E - q

∆Η = ΔΕ + P∆V

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

Critical temperature for a gas depends upon

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Shape of molecule

Size of molecules

Inter molecular forces

All of these

Deep sea divers breath air under increased pressure, therefore they use a mixture of

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96% N₂and 4% O₂

96% O₂and 4% N₂

94% N₂and 6% O₂

94% 0₂and 6% N₂

Which compound shows the highest melting point

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water

Propanoic acid

Methanoic acid

Ethanoic acid

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

State of hybridization of carbon in the carbocation is

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sp3

sp

sp2

dsp2

The type of isomerism shown by alkyl halides is

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geometric

functional

positional

metamerism

If v is the volume of one molecule of a gas under given conditions, then Van der Waals constant b is (N_Ais Avogadro number)

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Deep sea divers take oxygen with:

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A heavy gas

A lighter gas

An inert gas

All of above