Question # 1

One mole of a gas refers to

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The number of molecules in one litre of gas

The number of molecules in one gram of gas

The number of molecules contained in 12 grams of ¹²C isotope

The number of molecules in 22.4 liters of a gas at S.T.P.

ln ethyl alcohol, the bond that undergoes heterolytic cleavage most readily is

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C-C

C-O

C-H

O-H

Electrons in 5d energy level are filled up in case of

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Lanthanides

Transition metals

Actinides

Rare gases

The reaction between Cu and conc. H2SO4 produces

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Cu+2

SO₂

SO₃

H₂

The number of molecules in one dm³of water is close to:

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6.02/22.4 x10²³

12.04/22.4 x10²³

18/22.4x 10²³

55.6x6.02x10²³

coordination number of N^a+ in NaC is:

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1

2

4

6

Which of the following reactions are usually slow?

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Neutralization of acids and bases

Displacement Reactions

Organic substitution reaction

Free radical reactions

The change in enthalpy when one mole of a substance is dissolved in a specified quantity of solvent at a given temperature is called

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Heat of reaction

Heat of solvation

Heat of combustion

Heat of solvent

Octet rule is not allowed in the formation of

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NF3

B.CF4

CCI4

PCI5

The volume of gas depends upon the ______ molecules

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Size of

Molecular weight

Space between

Both a and b

A certain buffer solution contains equal cone. of X- and HX. Ka for HX is 10(-8). The pH of buffer is

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3

11

8

14

The one atmospheric pressure of air in term of pound per square inches is

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101.325

1.01325

760

14.7

Evaporation of liquid takes place at every temperature. What when temperature becomes constant?

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the rate of condensation is greater than teh rate of condensation

it depends upon the nature of the liquid

rate of evaporation is greater than the rate of condensation

the rate of condensation and evaporation become equal

The rate diffusion of H₂is 4 times than the of an unknown gas at same temperature and pressure, the molecular mass of unknown gas is

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32

16

4

64

Which is not present as heteroatom in heteroeyclie compounds?

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Sulphur

Nitrogen

Oxygen

Chlorine

Correct order of intermolecular forces

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Gas < liquid < solid

Liquid < gas < solid

Gas < liquid < solid

Gas = liquid = solid

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

One Joule is equivalent to

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4.184 cal.

0.4184cal.

1/2 cal.

1/4.184 cal

The value of ∆V being very small. The term P∆V can be neglected for process involving

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Liquid and gas

Solids and gases

Liquid and solid

None of these

The oxidation state of transition elements is usually

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Variable

Single

Constant

Infinite

Which of the following is the correct equation to calculate relative molecular mass of a gas

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M=mPRTV

M=mPR/VT

M=PV/mRT

M=mRT/PV

Which is an intermediate in SN1 reaction

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Ethoxide ion

Carbocation

alkyl halide

alkene

The hydrocarbon with maximum B.P is

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CH4

C6H14

C4H10

C2H6

Which of the following compound have empirical formula, but no molecular formula

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H20

C6H6

H₂O₂

NaCl

When graph is plot between P and 1/V at constant temperature. A straight line obtains which move toward ______ when temperature increase

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Pressure axis

Volume axis

1/V axis

1/P axis

Which of the following statement is correct if the intermolecular forces in liquids A,B and C are in the order A < B < C?

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B evaporates more readily than A

B evaporates less readily than C

A and B evaporates at the same rate

A evaporates more readily than C

Alcohols of low molecular weight are:

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Soluble in water

Insoluble in water

Soluble in water on heating

Insoluble in all solvents

Which one of the following statements about positive ions is incorrect?

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they are also known as cations

they are formed when electrons are removed from atoms

they are larger than the atom from which hay were formed

they are smaller than the atom from which they were formed

Which of the following is more reactive where 0-H bonds break

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P°alcohol

T° alcohol

S°alcohol

Cannot be predicated

Mercury does not wet the glass because of

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repulsion

weak cohesive force

high viscosity

capillary action

To measure the true pressure of a gas collected over water, the pressure due to water vapoure is:

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added to the total pressure

multiplied to the total pressure

divided by the total pressure

subtracted form the total pressure

Which one of the following has zero dipole moment

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NH3

CHCI3

H2O

BF3

In MgCl2, the oxidation state ofCI is

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Zero

-2

+2

-1

The critical temperature of NH₃ is greater than CO₂ due to its:

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Greater polarity

Stable polarity

Lesser polarity

None of above

The molecules of CO2, in dry ice form the

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covalent crystals

molecular crystals

none of these crystals

ionic crystals

Octyl acetate has the flavor of

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Orange

Pineapple

Banana

Apple

If 250 cm³of hydrogen gas is cooled from 127°C to -73°C at constant pressure then new volume of gas is ______ dm³

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0.25

0.375

0.125

0.0625

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

H2O and HF are the hydrides of the second period. Fluorine is more electronegative than oxygen. Anyhow, the boiling point of water is greater than that of HF. This is due to:

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water is more polar than HF

water has a bent structure

HF has a zig zag structure after making hydrogen bonding

the number of hydrogen bonds produced by water are greater than that of HF

Methyl cyanide, on boiling with mineral acids yield

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Acetic acid

Formic acid

Propanoie acid

Butanoic acid

Esterification of CH3COOH isreaction

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Acid base

Electrophilic

Redox

Nucleophilic

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

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Mg

K

Be

Li

Among the following the polycyclic aromatic compound is

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Styrene

Naphthalene

Toluene

Acetophenone

The element with highest E°red

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N

F

O

CI

Coinage metals Cu, Ag and Au are the least reactive because they have

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Negative reduction potential

Negative oxidation potential

Positive reduction potential

Positive oxidation potential

The reagent for alkaline hydrolysis of ethyl bromide to form ethyl alcohol is

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water at room T

Alcoholic KOH+heat

Ethanol + heat

dil. NaOH+ heat

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 ideal gas law holds best under the conditions of

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high pressure and high temperature

low pressure and high temperature

low pressure and low temperature

high pressure and low temperature

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

If the pressure of gas reduced to one half and temperature is increased twice then density of gas will be

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4 times

2 times

1/2 times

1/4 times

Which forms metallic crystals

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Cu

NaCI

SO₂

NH₄CI

The respiration process taking place in animals depends upon a difference in:

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vapour pressure

osmotic pressure

partial pressure

atmospheric pressure

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

The total K.E. of one mole of an ideal gas is given by:

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1/2 RT

3/2 RT

1/2 KT

3/2 KT

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

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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remain unchanged

increase four times

reduce to 1/4

be doubled

A student put two eggs A and B in HCL solution, After five minutes he took them out for weighing but egg dropped in water accidentally. The student was able to take it out after 30 minutes, He weighed it, Its weight was 40.33g. Weight of egg B was also 40.33g. Teacher told him that if both eggs have been dropped in water, the weight of egg B would have been:

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equal to that of egg A

less than that of egg A

greater than that of egg A

unaffected instead

In a saturated solution of AgCl, the molar concentration of Ag+ and Cl- is 1.0x10(-5)M each. What is the value of Ksp

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1.0x10(-5)

1.0x10(-15)

0.1x10(-5)

1.0x10(-10)

Which of the following statement is not true?

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The pressure of a gas is due to collision of the gas molecules with the walls of the container.

The molecular velocity of any gas is proportional to the square root of the absolute temperature.

The rate of diffusion of a gas is directly proportional to the density of the gas at constant pressure.

Kinetic energy of an ideal gas is directly proportional to the absolute temperature.

The maximum number of isomer for an alkene with the molecular formula C2H8

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2

3

4

5

During oxidation process, oxidation number of an element

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Decreases

Increases

Remains constant

Both a and b