Question # 1

To prepare ethane by Wurtz synthesis the suitable alkyl halide is

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Ethyl iodide

any alkyl iodide

Ethyl chloride

Methyl bromide

Oxidation state of Mn' in KMnO4. K2MnO4, MnO2 and MnSO4 is in the order

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+7.+6.+2,+4

+6,+7,+2,+4

+7. +6.+4.+2

+4, +6, +7,+2

The movement of gas molecules from a region of high pressure to vacuum is called:

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Evaporation

Effusion

Conduction

Diffusion

Which one is very weak acid

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HF

HCI

H2CO3

H2O

Higher the surface area available for reaction

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slower the reaction

faster the reaction

constant the reaction

lower the Ea

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

Which of the following are more temperature senesitive

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Liquid crystals

Solid crystals

Ionic stals

None of above

The reaction that generates an ionic bond is

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Halogenation of ethene

polymerization of ethene

Hydrogenation of ethyne

Reaction of ethyne withs sodamide

Vapour pressure of a liquid is more if

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the intermolecular forces between the molecules of the liquid are strong

the intermolecular forces between the molecules of the liquid are weak

more liquid is present in a container

liquid has more surface area to evaporate

CO2 and SO2 are both triatomic molecules, but heat of vaporization of SO2 is greater than that of CO2. This is due to

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greater electronegative character of sulphur

greater size of SO2 molecule

SO2 is polar and CO2 is non-polar

SO2 is more acidic in nature than CO2

The actual volume of gas molecules is considered negligible at following pressures

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2atm

4atm

6 atm

8 atm

Soda lime is often employed to remove both

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H2O and NO2

CO2, and NO2,

H2O and CO2

H2S and CO2

Critical temperature for a gas depends upon

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Shape of molecule

Size of molecules

Inter molecular forces

All of these

Unit of the rate constant depends upon the

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Molecularity of reaction

Order of reaction

Concentration terms

Number of reactants

Elastic collision involves:

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gain of energy

loss of energy

no relationship between elastic

no gain or loss of energy

How many allotropic forms are present in carbon?

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Two

Four

Three

Five

Which one of the following equations represents the 1st ionization energy of Na?

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Na(s) ---->Na⁺ (g) + e^-

Na(g) --->Na⁺ (g) + e^-

Na(s) --->Na⁺ (s) + e^-

Na (s) + e^- ---> Na⁺ (g)

Under which condition CO has the maximum molar volume.

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high T and P

Low T and High p

high T and low pressure

Low T and low P

Which of the following is not a property of crystalline solid

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geometric shape

cleavage plane

anisotropy

isomerism

Liquids are less common than:

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Solids.

Plasmas.

Gases.

All of above.

Which statement explains why the boiling point of methane is higher than that of neon?

[A_r:H.1:c,12:Ne,20]

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A molecule of methane has a greater mass than a molecule of neon

Molecules of methane form hydrogen bonds but those of neon do not

Molecule of methane have strongel intermolecular forces than those of neon

The molecule of methane is polar, but that of neon is not

Glycerine is a polar compound. It boils at 290°C under one atmospheric pressure. It should be distilled under reduced pressure due to reason that

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there are strong intermolecular forces between molecules of glycerine

it decomposes at 290°C

low pressure makes the liquid to boil at high temperature

the reduced pressure decreases the boiing point of liquids

Water may boil at 170C when external pressure is

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760 torr

170 torr

2115 torr

700 torr

A graph between P and PV constant temperature and number of moles is parallel to:

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Y-axis

X-axis

Z-axis

Pressure axis

An ideal gas, obeying Kinetic theory of gases cannot be liquified, because

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its critical temperature is above 0°C

its molecules are relatively small in size

It solidifies before becoming a liquid

Forces acting between its molecules are negligible

Acetaldchyde and ketone form addition product with

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Phenyl hydrazine

Hydroxylamine

Hydrazine

hydrogen cyanide

The crystal of diamond is

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ionic

molecular

covalent

metallic

The stoichiometric calculations for a chemical reaction results in

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Actual yield

Percentage yield

Theoretical yield

Selectivity

What is the formula of dolomite?

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CaMg3 (SiO3)4

MgCO3

MgCO3.CaCO3,

MgSO4

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

Prosthetic groups are

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helical structures in protein

sulphur containing parts of protein

non-protein parts in compound proteins

sites for hydrogen bonding

The total pressure exerted by a mixture of gases is the sum of the partial pressure of all the gases present is a statement of

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Charle's Law

Boyle's Law

Dalton's Law

Graham's Law

Which one of the following statements is wrong for gases?

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gases do not have a definite shape and volume

volume of the gas is equal to volume of container confining the gas

confirmed gas exerts uniform pressure on the walls of its container in which it is enclosed

mass of gas cannot be determined by weighing a container in which it is enclosed

Which one of the following doesn't exhibit allotropy?

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Bi

As

N

P

Which one of the following is a powerful electrophile used to attack on the electrons of benzene ring?

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FeCl2

Cl+

FeCl-4

Cl2

The long chains of amino acids are coiled around one another into a spiral by

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ionic bond

Van der Waal's forces

hydrogen bonding

overlapping of orbitals

The attractive forces between molecules of a gas and their sizes can be ignored at

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high pressure

low temperature

low temperature and high pressure

low pressure and high temperature

Which one is an isomorphic pair?

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NaNO3, CaCO3,

NaF, MgO

K2SO4 ,K2Cr2O7

Zn, Cd

suppose that an ocean of mercury replaced all the air of the air of the earth . How deep would this ocean have to be to exert the same pressure as the air:

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77cm

76cm

79cm

78cm

Which of the follwing dnes not give brick red precispitate wits Fehling's solution

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Acetaldehyde

Formalin

prorionaldehyde

Acetone

The kinetic energy of 4 moles of nitrogen gas at 127°C is? cals.(R = 2 cal mol^-1 K^-1)

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4400

3200

4800

1524

The diffusion of gasses at absolute zero will be:

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Slightly decrease

unchanged

Slightly increased

Zero

During space flights, astronauts ohlained water from

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Nickel cadmium cells

Lead accumulator

Fuel Cell

Alkaline battery

An ideal gas obeying kinetic gas equation can be liquefied if

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Its temperature is more than critical temperature

Its pressure is more than critical pressure

Its pressure is more than critical pressure but temperature is less than critical temperature

It cannot be liquefied at any value of P and T

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 arrangement ABC, ABC .... is referred as

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cubic close packing

octahedral close packing

hexagonal close packing

tetrahedral close packing

In Boyle's law which of the following pair is variable:

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Temperature and quantity of a gas.

Pressure and volume.

Volume and quantity of a gas.

Pressure and quantity of a gas.

Carboxylic acids reacts with sodium carbonate, & gas evolved in this reaction

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CO2

H2

CO

Both a &b

TiCl4 is used as catalyst for manufacture of

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Sulphuric acid

Plastics

Ethanol

Tetraethyl lead

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

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Yellow

Blue

Violet

Red

A student mixed ethyl alcohol with small amount of sodium dichromate and added it to the hot solution of dilute sulphuric acid. A vigorous reaction took place. He distilled the product formed immediately. What was the product?

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Aceton3

Dimethyi ether

Acetic acid

Acetaldehyde

The value of general gas constant R is derived from:

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Newton's Cooling law

Maxwell's law

Avogadro's law

Charle's law

For the purpose of interacts which one of the following arrangements represents the correct of increasing stability?

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covalent < hydrogen bonding < London forces < dipole-dipole

London forces < hydrogen bonding < dipole-dipole < covalent

London forces < dipole-dipole < hydrogen bonding < covalent

Dipole-dipole < London forces < hydrogen bonding < covalent

Which of the following is not a postulate of the kinetic theory of gases?

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when gas particles collide, their total kinetic energy increases

gases consist of molecules in a constant state of random motion

when gas particles collide their total kinetic energy does not change at all

The gas particles travel in straight lines unit they collide with one another or with the walls of the container

Which of the following gas will have lowest rate of diffusion

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CH₄

N₂

NH₃

CO₂

Which of the following are responsible for the colour developed in transition elements compounds?

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s-orbitals

p-orbitals

d-orbitals

f-orbitals

If a gas expands at constant temperature

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The pressure decreases

The Kinetic energy of the molecules remains the same

The kinetic energy of the molecules decreases

The number of molecules of the gas increase

What is distilled first?

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Liquid CO₂

Liquid N₂

Liquid O₂

Liquid H₂

Which molecule is least ionic"

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NaCI

HCL

HF

CsF

If volume of an ideal gas at 0C° 536cm3, what is volume at 1°C

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373 cm3

646 cm3

Becomes 0cm3

746 cm3

The existence of an element in more than one form is called

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allotropy

isomorphism

polymorphism

isotropy