Question # 1

The gases H₂, O₂, H₂S and SO₂diffuse in the order

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SO₂>H₂S>H_2>O₂

H₂S>SO₂>O₂>H₂

O₂>SO₂>H₂>H₂S

H₂>O₂>H₂S>SO₂

The volume of an ideal gas is decreased to half, What will happen to the force exerted on the walls of the container by the gas particles?

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the force is halved

the force increases by a factor of 4

the force remains constant

the force increased by a factory of 2

Ethane when completely halogenated in excess of chiorine can form

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Hexachloroethane

Dichloroethane

Pentachloroethane

1.1.2.2-terachloroethane

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

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viscometer

photometer

barometer

stalagmometer

Which of the following gases have lowest density at room temperature

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CO

N₂

Ne

NH₃

Which statement is incorrect

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pH and [OH-] are inversely related to cach other

pOH and [OH-] are inversely related to each other

pH and [OH-] are directly related to each other

pOH means potential of hydroxyl ion concentration

Polymorphism is shown by AgNO3. Which one of the following options is true for AgNO3?

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Orthorhombic and rhombohedral

Cubic and orthorhombic

Cubic and tetragonal

Monoclinic and hexagonal

By increasing pressure two times and decreasing temp. two times the volume of gas

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Volume increases 4 times

Volume decreases 4 times

Volume increases 2 times

Volume decreases 2 times

The gases suddenly if these are allowed to expand:

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react

cool down

heat up

moved randomly

Energy required to remove electron from an atom

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Ionization potential

Electronegativity

Electropositivity

Electron affinity

The solid particles posses only ______ kinetic energy

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Translational

Rotational

Viberational

Circular

Which pair of the gases doesn't obey Dalton's Law of partial pressures

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H₂and O₂

N₂and O₂

H₂S and H₂

NH₃and HCl

Smell of cooking gas during leakage from gas cylinder is detected because of the property of:

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Effusion

Evapotration

Diffusion

Conduction

The volume of gas depends upon the------- moleules

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Size of

Space between

Molecular weight

both a and b

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

General gas equation is combination of

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Boyle s law

Avogadro s law

Charles s law

All of these

At ordinary temperature, the most nearly ideal gases are

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N₂

He

H₂

all these

When light is exposed to a typical transition element, then electrons jumps from low orbitals to higher orbitals in

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f-orbitals

s-orbitals

p-orbitals

d-orbitals

The Complete oxidation of ethanol produces first Ethanal than

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Ethanal

Propanone

Ethanoic acid

Benzoic acid

Glycerin boil at 290°C under normal atmospheric pressure. If the pressure is reduced to 50 mm of Hg, it will boil

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above the given temperature

below the given temperature

at the same temperature

at 25°C

Born-Haber cycle is an application of

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Hess's law

1" law of thermodynamics

Avogadro's law

1law of thermochemistry

H₂O is liquid at room temperature whereas H₂S is a gas because

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H₂O used as drinking water, but H₂S has rotten egg smell

H₂O is neutral. H₂S is a weak acid

stronger hydrogen bonding in H₂O than in H₂S

H₂O occurs abundantly than H₂S

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

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

lce occupies more space than liquid water

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9%

10%

11%

12%

Which of the following undergoes easy dehydration?

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3-MethyIbutan-2-ol

Ethanol

2.Methylpropan-2-ol

Methanol

Zn has

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Zero unpaired electrons

Three unpaired electrons

Five unpaired electrons

One paired electrons

The boiling point of glycerin at 1 atmospheric pressure is:

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290°C

390°C

190C°

210°C

How many esters are possible for C2H8O2

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3

2

4

5

Boiling point of water remains 100°C although heat is continuous supplied. it is because

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decomposition of water takes place

hydrogen bonding is increased

external atmospheric pressure is not changing

kinetic energy of H₂O molecules is increasing

Which is a good nucleophile as well as a good leaving group?

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F-

Cl-

Br-

I-

The oxidation state of transition elements is usually

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Variable

Single

Constant

Infinite

At compromise distance the forces dominating between atoms are

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repulsive forces

attractive forces

Dipole induced dipole force

H-bonding

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

The collision which results in chemical reaction

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Effective collision

Ineffective collision

Useless collision

All of the above

The B.P. of compound is mostly raised by

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dipole-induced dipole interactions

london dispersion forces

intramolecular H-bonding

intermolecular H-bonding

Keeping in view the charge density select the compound amoung the following having highest lattic energy:

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LiBr

KCI

MgO

NaF

Which alkaline earth metal makes peroxide?

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Ba

Be

Mg

Ca

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

The structure of sodium chloride is

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simple cube

body centered cubic

face centered cubic

depends upon conditions

The volume of gas depends upon the ______ molecules

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Size of

Molecular weight

Space between

Both a and b

If reactants are conductor of electricity, then method is used to measure the change in concentration of reaction

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Optical rotation

Refractrometric

Dilatometric

Electrical conductivity

Molar volume of CO₂ is maximum at

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NTP

0°C and 2.0 atm

127°C and 1 atm

273°C and 2.0 atm

A mixture of H₂, H2 and CH₄has total number of 0.51 mole and total pressure of 1 atmosphere. If the mass of H₂is 0.8 gram, then its partial pressure is

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0.4 atm

0.6 atm

0.776 atm

0.667 atm

choose the temperature among the following at which real gas obeys ideal gas laws when pressure range is appreciable:

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critical temperature

boyle's temperature

inversion temperature

transition temperature

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

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

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6

4

2

8

Which state about gases is not correct?

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They spread throughout the vessel.

Pressure is due to collision.

There are larger spaces between the molecules.

Molecules are arranged regularly.

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

Gram atoms of hydrogen in 5.5 g H2

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5.50

2.25

5.45

2.20

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.

^{Reaction of ethyl bromide with ammonia}

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Completes in a single step

Completes in two steps

Continues till N is left with no lone pair

is reversible

Esterification of CH3COOH isreaction

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Acid base

Electrophilic

Redox

Nucleophilic

What is the formula of silica?

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Si2O3

SiO2

Si3O4

SiO-

An instrument which is used to measure the pressure of a gas is called:

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barometer

photometer

stalagmometer

viscometer

Mass spectrometry is used to determine the

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Number of isotopes of an element

Relative abundance of isotopes

Relative isotopic masses

All of these

Which one of the following is NOT a nucleophile

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NH2+

BF3

H2O

CH3-

Molecular ions are produced in mass spectrometer. Which type of molecular ion formed more abundantly.

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Negatively charged

H⁺ ions

Positively charged

equal positive and negative ions

Plastics are amorphous solids and

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have sharp melting points

undergo clean cleavage when cut with knife

do not undergo clean cleavage

possess orderly arrangement over long distances

In metallic crystals the atomic orbitals combine to produce a large number of closely bands of energy according to

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electron pool theory

molecular orbital theory

valence bond theory

electrostatic force of attraction

Compared with alkaline earth metals, the alkali metals exhibit.

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lower ionization energies

greater hardness

high boiling point

smaller ionic radii