Question # 1

The acidity of phenol is due to its

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Nature of Benzene

Double bond in benzene ring

Natute of phenoxide ion

Hydroxyl group

An amine is produced in the following reaction
C2H5l+2NH3-------C2H5NH2 +NH4l. What is mechanism?

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

Pressure of 1Nm^-2 is equal to

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One bar

1 psi

One pascal

One atmosphere

In solid, the temperature is the measure of:

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Rotational kinetic energies.

Translational kinetic energies.

Vibrational kinetic energies.

None of above.

H₂effuses through a porous pot at a rate of 500 cm³per minute at 0°C.The rate of diffusion of O₂through the same vessel at 0°C per minute is

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500 cm³

250 cm³

1 dm³

125 cm³

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

Stability of Cu-metal is due to filled of d-orbital

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Half

Completely

Partially

Quarterly

in diamond a unit cell is tetrahedral and averall crystai structure is

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face centred cubic

body centred cubic

tetrahedral

hexagonal

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

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organic nature

H-bonding

molecular size

dipole-dipole forces

Which af the following compound reacts slower than benzene in the electrophilic substitution.

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Phenol

Nitrobenzene

Toluene

Aniline

The basic distinction between solids, liquids and gases lies in difference between.

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Strength of the bonds

Size of molecules

space which the molecules occupy

All of above

Which alkaline earth metal makes peroxide?

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Ba

Be

Mg

Ca

In the formation of NaCl crystals from its aqueous solution, its cubic shape is changed to needle like when 10% urea is present as impurity, this phenomenon is called as

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habit of crystal

polymorphism

anisotropy

cleavage

The red brown ppt. of Fehling solution and benedict solution tests are of

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Ag

Cu2O

CuO

AgBr

Corrundam is ore of which element?

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Al

Th

In

Mg

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

The rate of diffusion of a gas of molar mass 72 as compared to H₂will be:

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Same

6 times

1.4 times

1/6 times

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

The oxidation state of carbon in C2O-²4 is

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+4

-4

+3

+2

The number of atoms or molecules whose concentrations determines the rate of a chemical reaction is called the

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Molecularity of the reaction

specific activity of the reaction

Order of the reaction

rate constant of the reaction

About 25% of earth crust mass is made up of element

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Oxygen

Silicon

Aluminium

Aluminates

The element which exhibits maximum catenation property is

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C

Pb

Ge

Sn

Which of the following gases have maximum root mean square velocity at 25°C:

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SO₂

NH₃

CO₂

H₂S

Cholestryl benzoate tums into milky liquid at

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140°C

145°C

148C°

149°C

Lithium differs from rest of members of its group due to which of following reasons

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High E.N of Li+1

Small radius

High charge density

All above are correct

The increase in reaction rate as a result of increase in temperature from 10K to 90K is

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512

256

400

112

The forces of attraction between ions and water molecules are known as

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dipole-dipole forces

London forces

dipole- induced dipole forces

ion-dipole forces

Units of van der Waals constant a is

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atm dm⁶/mol² & Nm⁴/mol²

atm dm⁴/mol² & Nm⁴/mol²

atm dm⁴/mol² & Nm⁶/mol²

None of these

The transition temperature of KNO3, is

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13.2°C

95.5°C

128°C

32.02°C

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

Alpha helix and beta pleated sheath are secondary structures of protein which are maintained by

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dipole forces

non-polar interactions

ionic bonds

Hydrogen bonds

Moles of protons in 20g of SO3

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10

20

40

80

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

Equal volumes of ideal gases contain equal number of molecules at:

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Same temperature

Same pressure

Same environmental conditions

Both (A) and (B)

The gas which obeys the gas laws at all conditions of temperature and pressure is

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ideal gas

perfect gas

real gas

noble gas

In a period the atomic radii

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increase

decrease

remain same

first increase, then decreased

Plaster of Paris is obtained from

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marble

bauxite

gypsum

limestone

Which one of following property is not true about alkali metals?

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Strongest bases due to their hydrides

Low ionization energy

Oxidation number more than +1

Form acidic oxides

The mass of 8.5 dm³of oxygen gas at 0.0821 atm and -1°C is

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100 g

10 g

1 g

0.1 g

Molar mass of formic acid in benzene comes out to be

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64

46

32

92

Which of following is oxidation state of oxygen in peroxides?

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-2

1/2

-1

+2

Which of the following compound is least reactive

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HCHO

CH3CHO

CH3COCH3

C6H5CHO

[Ti (H20)6]3+ ion isin colour.

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Yellow

Blue

Violet

Red

All the metal shine when they are freshly cut The reason is

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the conductivity of the metal is increased

the process of cutting gives energy to the metal atoms

the electrons become less delocalized according to valance bond theory

the electrons are excited at higher energy levels and emit the photons when they fall back

H₂and O₂are enclosed in porous vessel. The effusion of these gases will take place like

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H₂effuses 4 times the rate of effusion of O₂

O₂effuses into air 4 times the effusion of H₂

both effuse at same rate

H₂effuses at 8 times the rate of effusion of O₂

Liquid hydrocarbon is

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methane

propane

ethane

hexane

The question vapour cause by heating a liquid is due to:

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increase of intermolecular interactions

increase of K.E of molecules

decrease of surface tension

increase in potential energy of molecules

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

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phosphorous and nitrogen

sulphur and magnesium

carbon and sodium

hydrogen and sodium

Rusting of iron metal Fe occurs when Fe gets converted into Fe2O3 What happen with Fe?

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F'e is neutralized

Fe is sublimed

Fe is reduced

Fe is oxidized

Which of the following transition metal forms colourless compounds in +4 oxidation state?

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Ti

Cr

Cu

Zn

Acetaldchyde and ketone form addition product with

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Phenyl hydrazine

Hydroxylamine

Hydrazine

hydrogen cyanide

A basic buffer solution can be prepared by mixing?

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Weak acid and its salt with strong base

Weak base and its salt with strong acid

Strong acid and its salt with weak base

Strong base and its salt with strong acid

During esterifcation, the alcobol molecule acts as:

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Oxidizing agent

Electrophile

Reducing agent

Nucleophile

If increase in temperature and volume of an ideal gas is two times, then the initial pressure P changes to

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4P

P

2P

3P

General gas equation is combination of

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Boyle s law

Avogadro s law

Charles s law

All of these

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

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genetic

Regulatory

nucleo

structural

In Case of elements the polymorphism is called

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Isotopic form

Allotropy

Isomorphism

Crystalline forms

Charle's law only obeys when temperature takes in ______ scale

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Celsius

Fahrenheit

Kelvin

Rickey

Intermolecular forces exist between molecules of group 7 elements which of the following sequence represents the strength of the intermolecular forces?

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Cl₂> Br₂> I₂

Br₂> Cl₂> I₂

Cl₂> Br₂> I₂

I₂> Br₂> Cl₂

Which one increases by common ion effect except?

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Crystallization

Solubility

Association of ions

All of these

K2SO4, and K2Cr2O4, are isomorphous solids and exist in

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cubic form

orthorhombic form

trigonal form

tetragonal