Question # 1

The reaction which is responsible for the production of electricity in the voltaic cell is

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Hydrolysis

Oxidation

Reduction

Redox

Which does not affect vapour pressure

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Nature of liquid

intermolecular forces

Temp

None of these

Which of the following tests helps to distinguish between alkyne and alkene?

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Lucas test

Tollen's reagent test

Baeyer's test

Fehling's solution test

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

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9/5

5/9

6/5

5/6

The units of ionic product of H2O is

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Mole dm-3

Mole2 dm-6

Mole-1 dm-3

Mole-2 dm-6

The specifie substance (metabolite) that fits on the enzyme surface and is converted to products is called

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Co-factor

Isoenzyme

Prosthetic group

Substrate

The deviation of a gas from ideal behaviour is maximum at

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-10°C and 5.0 atm

100°C and 2.0 atm

-10°C and 2.0 atm

0°C and 2.0 atm

Pyridine is an example af

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Homocyclic compound

Heterocyclic compound

Carbocyclic compound

Aliphatic compound

The exothermic process is

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Evaporation

Sublimation

Respiration

Boiling

Which set of elements is good loser of electrons

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F2. Cl2, Br2

N, P. As

O. S, Se

Li, Na, K

NH₃gas is liquefied more easily than N₂Hence

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Van der Waals constants a and b of NH₃> that of N₂

Van der Waals constants a and b of NH₃< that of N₂

a(NH₃) > a (N₂) but b (NH₃) < b(N₂)

a (NH₃) < a (N₂) but b (NH₃) > b (N₂)

Which gas diffuses more rapidly?

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O₂

SO₃

NH₃

H₂

Which is the incorrect value of gas constant R?

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2.987 cal k^-1 mol ^-1

3.313 Nmk^-1 mol^-1

62400dm³ atm k^-1 mol^-1

1.10821atm dm3k^-1 mol^-1

In a closed vessel a gas is heated from 300 K to 600K The kinetic energy becomes remains

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Double

Same

Half

Four times

All of the following have cleavage planes except:

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molecular crystals

metallic crystals

covanent crystals

ionic crystals

The product of pressure and volume remains constant when temperature and quantity of gas is:

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Zero

Variable

Kept constant

None of above

The mono atomic gas molecules are ______ gas molecules

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Halogen

Zero

Noble

Both b and c

Which of the following is primary alkyl halide

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IsopropyI halide

Sec-butyl halide

Tert-buryi halide

Neo-pentyl halide

Which one of the following pair of atoms is most likely to form an inoic bond?

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Na and F

C and F

N and F

O and F

To prepare ethane by Wurtz synthesis the suitable alkyl halide is

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Ethyl iodide

any alkyl iodide

Ethyl chloride

Methyl bromide

All of following acids have hydrogen bond in liquid state except:

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nitric acid

sulphuric acid

hydrochloric acid

hydrofluoric acid

The oxidation of 1 - propanol in the presence of H2SO4, +K2Cr207 produces final product

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Acetaldehyde

Propanal

Acetone

Propanoic acic

The height of the peak in the mass spectrum shows

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Number of isotopes

Relative abundance

Mass number

Number of protons

The conversion of tertiary alcohols into alkenes in the presence of K2Cr2O7 + H2SO4 is

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Addition reaction

C-H bond cleavage

Elimination reaction

Combustion reaction

The strongest conjugate base is

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OH-

CH3O-

C6H5O-

CH3COO-

Benzene reacts with Ethyl chloride in presence of AICls to give

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Benzalchloride

Benzyl chloride

Ethyl benzene

Benzotrichloride

The pressure exerted by the vapours in equilibrium with its pure liquid at given temperature is called the

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equilibrium pressure

atmospheric pressure

vapour pressure

external pressure

The crystal system which has all cell angles equal, but not 90°and less than 120° , the system is

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orthorhombic

monoclinic

hexagonal

rhombohedral

CO₂gas is dissolved in water due

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dipole-dipole interactions

higher molecular mass of CO₂

ion dipole attractive forces

hydrogen bonding

Acording to the kinetic theory of gases

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The pressure exerted by a gas is proportional to mean square velocity of the molecules

The pressure exerted by the gas is proportional to the root mean square velocity of the molecules

The root mean square velocity is inversely proportional to the temperature

The mean translational KE of the molecule is directly proportional to the absolute temperature

What is true for a molecule with standard geometry

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It lacks a Ip

It can't be a donor

It can be an acceptor

All

2,5-dimethyl-1-hexene has

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Two sp2 hybridized carbons

Six sp2 hybrid carbons

Two double bonds

Four pi electrons

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.

If empirical formula of a compound is CH2 and its molecular mass is 56amu. What will beits molecular formula

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CH2

C3H6

C2H4

C4H8

At what temperature, would N₂molecules have the same average speed as He-molecules at 300 k?

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1100 K

2100 K

420 K

None

Which compound is obtained hy the elimination reaction on bromoethane?

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Butene

Ethene

Propene

Propane

The average kinetic energy of an ideal gas per molecule is SI units at 25°C will be

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6.17 x 10^-21 KJ

6.17 x 10^-21 J

6.17 x 10^-20 J

7.16 x 10^-20 J

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

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allotropy

isomorphism

polymorphism

isotropy

Gases of air, always remain in random motion and do not settle due to:

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Difference of molecules masses of air gases.

Difference in partial pressure of gas molecules.

Unequal number of different gas molecules.

Elastic collision of gas molecules.

A graph between P and 1/V at constant temperature and number of moles of a gas meets the:

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Y-axis

X-axis

Origin

None of above

In homocyclic compounds the ring consists of

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Carbon and oxygen atoms

Carbon and nitrogen atoms

Only carbon atoms

Carbon atoms with one hetero atom

When HCI gas is passed through saturated solution of rock salt, the solubility of NaCl

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Increases

May increase or decrease

Decreases

None of these

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⁺

At freezing point of water, the density decreases due to

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change of bond angles

change of bond lengths

cubic structure of ice

empty spaces present in the structure of ice

Among the following molecules, which one has coordinate covalent (dative) bond?

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CCI4

CO2

CO

CH4

Charles's law is only obeyed at which temperature scale

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Celsius

Kelvin

Fahrenheit

both A&B

what is the exact value of angle in BF3

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90

104.51

119.5

120°

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 density of methane at 2.0 atmosphere pressure at 27°C is

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0.13 gL^-1

0.26 gL^-1

1.30 gL^-1

26.0 gL^-1

The volume of given mass of gas is directly proportional to absolute temperature when pressure is kept constant this is called

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Boyle's law

Charles's law

Graham's law

Dalton's law

What is not correct about ∆HF

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It is always negative

Ìts value gives an idea about the relative stability of reactants and the products.

Its value can be greater or less than zero

Value depends upon nature of bonds

The correct order of increasing attractive strength for weak intermolecular forces is....

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dipole-dipole interaction hydrogen bonding, van der Waals forces

van der waals forces dipole- dipole interaction, hydrogen bonding

hydrogen bonding, dipole-interaction, van der Waals forces

hydrogen bonding, van der Waals forces, dipole-dipole interaction

which of the following d blocks element can showthe highest oxidation number is its ompound

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Chromium

iron

Copper

Manganese

The deviation of a gas from ideal behavior is maximum at:

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-10∘C and 5.0 atm

-10∘C and 2.0 atm

100∘C and 2.0 atm

0∘C and 2.0 atm

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

All gases liquefly before reaching at

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273°K

373°K

0 K

73°C

Most reactive among the following

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Li

Mg

Ca

Na

Pressure of 1Nm^-2 is equal to

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One bar

1 psi

One pascal

One atmosphere

Hydrogen bonding is extensively present in proteins which form the spiral. The hydrogen bond being produced is between

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nitrogen and hydrogen atom

oxygen and hydrogen atom

carbon and hydrogen atom

oxygen and carbon atom

The vapour pressure of a liquid depends upon

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amount of the liquid

surface area

temperature

size of container

Instantaneous dipole-induced dipole forces are also known as:

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dipole-dipole interactions

hydrogen bonds

covlent bonds

Van der Waals forces