Question # 1

Critical temperature of argon's gas is low. the reason is that

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it contains four lone pairs

it is mono atomic gas

it has as smell signed

its polarizability is low

Real gases deviate at low temperature from ideal behaviour due to

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there is transitional motion of molecule

the collissions between the molecules are decreased

volume of gas is decreased

the inter molecular attractive forces become significant

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

The value of van der Waal s constant a for gases CO₂, N₂, and SO₂, are 3.59 ,1.39, 1.36, and 6.17 atm dm⁶ mol^-2respectively the gas which can be most easily liquefied is

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CO₂

O₂

N₂

SO₂

Equal volumes of ideal gases contain equal number of molecules at:

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Same temperature

Same pressure

Same environmental conditions

Both (A) and (B)

A gas is heated in such a way that its volume and absolute temperature both are doubled. the pressure of gas:

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Becomes 4 time

Becomes half

Becomes 2 time

Remains same

A temperature at which two cyrstalline forms of a substances coexist in equilibrium is called

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standard temperature

critical temperature

transition temperature

absolute temperature

The ionization energy of hydrogen atom is

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Zero

131.3kJmole

13.13kJ/mole

1313kJ/mole

When does average rate become equal to instantaneous rate of reaction

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At the start of reaction

time interval is zero

at the end of reactior

time interval approaches zero

Pressure of 1Nm^-2 is equal to

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One bar

1 psi

One pascal

One atmosphere

When water freezes at 0°C, its density decreases due to

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cubic structure of ice

empty spaces present in the structure of ice

change of bond lengths

change of bond angles

What is the formula of dolomite?

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CaMg3 (SiO3)4

MgCO3

MgCO3.CaCO3,

MgSO4

London forces are

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stronger than dipole-dipole interactions

weaker than dipole-dipole interactions

equal to dipole-dipole interactions

sometimes stronger and sometimes weaker than dipole-dipole interactions

The highest oxidation state of manganese is

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+7

-7

+6

+4

Areal gas obeying Van der Waal's equation will resemble ideal gas ilf the:

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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

The major binding force of diamond,silicon and quartz is

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Electostatic force

Electical attraction

Ceobalent bond force

Non convalent bond force

Most of the reactions which give stable products are

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Endothermic

Exothermic

Isothermal

Non of these

The molecules of CO₂is dry ice form the

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ionic crystals

covalent crystals

molecular crystals

any type of crystal

The ratio of volume to temperature on Kelvin scale is constant according to:

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Charle's law

Newton's law

Coulomb's law

Boyle's law

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

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vapour pressure

osmotic pressure

partial pressure

atmospheric pressure

The radioactive disintegration of 238U92 is

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First order

Second order

Third order

Zero order

The maximum possible number of hydrogen bonds in which a H₂O molecule can participate is:

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1

2

3

4

which of the following is a typical transition metal?

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Sc

Y

Ra

Co

The rate of reaction between A and B increases by a factor of 100, when the concentration of A is increased 10 folds, the order of reaction with respect to A is

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10

1

4

2

Which if the following will have the same number of molecules at S.T.P?

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280cm³ of CO₂ and 280cm³ of N₂O

11.2dm³ of O₂and 32g of O₂

44g of CO₂and 11.2dm³ of CO

28g of N₂and 5.6dm³ of oxygen

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

The motion imparted to the gas molecules by gravity is

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very small

very large

negligible

appreciable

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

Paramagnetic behaviour is caused by the presence of

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Unpaired electrons

Paired electrons

Paired protons

Paired electrons in an atom. molecule or ion

covalent network of crystals has:

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lower melting point than molecular crystals

higher melting point than molecular crystals

H-bonding

Which of the following is the element not present in all proteins?

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Carbon

Hydrogen

Nitrogen

Sulphur

The reduction potentials of non-metals are A =+0.54V, B=+1.08V, C=+1.36V. D= +2.87V Which non -metal can displace all other from aqucous solution of their salts

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A

C

B

D

If Cl2 is passed through hot NaOH. NaCIO3 is formed and the oxidation number of CI changes from

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-1 to 0

0 to +5

0 to-1

0 to +1

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

Which order of vapour pressure in the following liquids is correct

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water > ethanol > acetone > ether

ether > acetone > ethanol > water

ether > ethanol > acetone > water

water > ether > acetone > ethanol

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.

Glucose is converted into ethanol by the enzyme present in the yeast

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Urease

Zymase

Invertase

Sucrase

At same temperature which substance has high kinetic energy:

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Liquid water

N₂gas in a container

Solid piece of iron

Solution of alcohol and water

The non polar gases of low polarizability have a very:

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Low critical temperature

Stable critical temperature

High critical temperature

The attractive forces which exist between ionic compounds and water molecules are

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dipole-dipole forces

ion diopole forces

istantaneous dipole-induced dipole forces

dipole-induced dipole forces

Which thermometer will have its reading 273 degrees greater than that of thermometer C?

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A

B

B has 273 degrees greater than A

C has greater reading than all other thermometers

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

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Yellow

Blue

Violet

Red