Question # 1

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

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2

3

4

5

One degree on Celsius scale is ______ time greater then Fahrenheit scale

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9/5

5/9

6/5

5/6

Covalent bonds are

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directional

Bidirectional

Multidirectional

Non directional

Elements of II-A group are called alkaline earth metals due to the reason that

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they occur in earth only

they form divalent cations only

they have ns2 electronic configuration

their oxides and hydroxides are alkaline in nature and metals are present in earth crust

L-asparginase is helpful in treatment of

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skin disease

blood cancer

heart failure

obstructive jaundice

Which of the following is the simplest form of matter?

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Gaseous state

Liquid state

Solid state

All of above

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

Energy of atom in compound is

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Higher than individual atom

Lower than individual atom

equal to individual atom

Impossible to predict

Consider gas is measure in bars then the units of rate of reaction is

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Mole dm-3 sec

Bars sec

Mole dm-3 sec-1

Bars sec-1

When purely alcoholic solution of sodium/potassiumhydroxide and halogenoalkanes are reacted an alkene is formed, what is the mechanism of reaction?

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Elimination

Debromination

Dehydration

Reduction

The vapour density of a gas is 11.2.The volume occupied by 11.2 g of this gas at N.T.P is

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22.4 litres

11.2 litres

1 litre

2.24 litres

A substances has M_r74.5, a melting point of 772°C and a boiling point of 1407°C. It conducts electricity only when in the liquid state.What is the bonding present in this substances?

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covalent

ionic

metallic

hydrogen bonding

Which one of the following is not true relationship

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Ethanoic acid reacts with PCI5, to give ethanoyl chloride. HCI and a third compound What is the third compound

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H3PO3,

POCI3

SO2

COCl2

An acid that exists as a cyclic dimer in benzene and shows a molar mass of 120g/mol is

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СН3СOOH

HCOOH

CI2CHCOOH

Сl3CCOOH

A real gas obeying Vander Waal's equation will resemble ideal gas if

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Both a and b are large

Both a and b are small

a is small and b is large

a is large and b is small

Keeping the temperature constant, if the gas is expended:

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Kinetic energy of molecules will increase.

Number of gas molecules increases.

Temperature will increase.

Pressure will decrease.

In the reaction A2 (g) + 4B2 (g) <-----------> 2AB4 (g) such that ∆H < 0, the formation of AB4(g) will be favoured at

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Low temperature and high pressure

Low temperature and low pressure

High temperature and low pressure

High temperature and high pressure

Higher the surface area available for reaction

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slower the reaction

faster the reaction

constant the reaction

lower the Ea

Water may boil at 120 °C when external pressure is:

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100 mm of Hg

700 mm of Hg

760 mm of Hg

1489 mm of Hg

The amount of energy released when gaseous ions of opposite charges combine to give one mole of a crystalline ionic compound is called

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bond energy

heat of formation

lattice energy

ionization energy

Amino acids react together to form the primary structure of proteins which is accompanied by

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addition of water

addition of ammonia

removal of ammonia

removal of water

The derivatives that cannot be prepared directly from the acetie acid

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Acetamide

Acetic anhydride

Ethyl acetate

Ester

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

A pressure of 1Nm^-2 is equal to:

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one bar

one pascal

stalagmometer

one aomosphere

Doubling the pressure in a liquid phase reaction

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Will double the rex

Will increase the rex

Will decrease the rex

Will not alter the concentration of reactant

The density of neon will be highest at

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STP

0°C, 2 atm

273°C, 1 atm

273°C, 2 atm

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

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CO2

H2

CO

Both a &b

R = 0.08205:

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atm dm³mol^-1k^-1

J mole^-1k^-1

Nm mol^-1k^-1

cal. mol^-1k^-1

.Both aldehydes and ketones are planar to the neighborhoods of carbonyl (C-0) group. Which one of the following bonds is distorted towards the oxygen atoms?

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pi-bond of C and O

Sigma bond of C and O

Sigma bond of C and H

Sigma bond of C and C

Which of the following is the unit for pressure of a gas in system international

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Nm^-2

mm of Hg

atmosphere

torrr

Ethyl and methyl groups are equidistant in a chain, the preference is given to?

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Ethyl

methyl

both ethyl and methyl

methyl mostly

One dm3 of H2 and O2: has different masses but no. of particles are

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same

H2 has greater

different

O2 has greater

The arrangement ABC, ABC .... is referred as

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cubic close packing

octahedral close packing

hexagonal close packing

tetrahedral close packing

A teacher told his student that air is a mixture. This is due to the reason that suddenly a student raised his hand and said:

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it has different properties from its constituents

oxygen can be removed from it

it is colourless

its composition is different at different altitudes.

At 100 atm, CH₄ develops:

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Ideal attitude

Non-ideal attitude

Serious attitude

Laughing attitude

The compressibility factor of an ideal gas is

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0

1

2

4

During oxidation process, oxidation number of an element

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Decreases

Increases

Remains constant

Both a and b

At constant temperature, volume of given mass of gas in inversely proportional to pressure on it. This statement is according to:

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Hook's law

Graham's law

Bolye's law

Charle's law

Honey contains glucose and fructose along with some other ingredients. It has greater viscosity due to:

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irregular shape of the molecules

greater molecular size and strong intermolecular forces

H-bonding

irregular shape of the molecules

Substance which is formed as well as consumed during a chemical reaction and have temporary existence.

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Reactant

product

Catalyst

Intermediate

Equal masses of methane and oxygen are mixed in an empty container at 25∘C.

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1/3

8/9

1/9

16/17

Which one is best buffer those have

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pH = pKa

pH > pKa

pOH < pKb

pKa =0

Which of the following metal oxides is antiferromanetic in nature?

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MnO₂

TiO₂

NO₂

CrO₂

At STP,a container has 1 mole of Ar,2 moles of CO₂,3 moles of O₂ and 4 moles of N₂.Without changing the total pressure if one mole of O₂ is removed,the partial pressure of O₂

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Is changed by about 26%

Is halved

Is unchanged

Change by 33%

The angle between the unhybridized 2pz orbital and the three sp2 hybrid orbitals in ethene is

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180°

120°

90°

60°

What will be the pH of 1.0 mol dm-3 of NH4OH, which is 1% dissociated

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2

12

0

2.7

Half-lives required to convert 100% reactant to produet for a first order reaction are

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10

1000

100

Infinity

Which of the following is exact relationship between °F and C°

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°F= 5/9[°C-32]

°C = 5/9 [°F]+32

°F = 9/5°C+32

All

Name the compound, which shows geometric isomerism

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I-bromo-2-chloropropene

2.3-dimethy lpropene

2-pentene

Both A & B

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

Rte of evaporation of petrol is greater than that of water at room temperature. This is due to the reason that:

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petrol is an organic compound

water molecules have small size

petrol molecules do not have

petrol molecules have greater size

Point out the substance which has maximum vapour pressure at a given temperature?

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Acetone

Water

Ethanol

Acetic acid

Compressibility factor for an ideal gas is

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1.5

1.0

2.0

0.5

The diffusion of gasses at absolute zero will be:

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Slightly decrease

unchanged

Slightly increased

Zero

Which of the substance is not going to react the sodium metal:

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Acetic acid

Methanol

Di methyl ether

Ethanol

C-H bond length in the benzene is

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0.99A°

1.09A°

1.12A°

1.34A°

The rate of diffusion of two gases are inverselly proportional to the square roots of their densities or molecular weights, is a statement of

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Charle's Law

Boyle's Law

Graham's Law

Dalton's Law

Which of the following are not known to form compounds in more than one oxidation state?

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Transition metals

Halogens

Alkali metals

Noble gases

If pressure is increased from a 2 atm to 4 atm on a gas then its volume will decrease from:

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3L to 1L

4L to 2L

6L to 4L

8L to 2L

The amount of heat required to convert one mole of solid into liquid is called

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molar heat of fusion

heat of fusion

heat of vaporization

heat of liquefaction