Question # 1

Which of the following is electrophile for alkylation?

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NO+2

SO3

R+

Both a & b

Equal volumes of gases at the same temperature and pressure contain equal number of particles.This statement is direct consequence of

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Perfect gas law

Partial law of volumes

Charle's law

Ideal gas equation

Which of these are isomrophous to one another NaCl, NH₄Br, K₂CrO₄, K₂SO₄

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NaCl and NH₄Br both cubic

NH₄Br and K₂SO_{4 both tetragonal}

K₂CrO_{4 and}K₂SO₄orthorhombic

NaCl and K₂SO₄both rhobohedral

The pi-electrons in the styrene are

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13

10

8

6

250cm of 0.2 molar potassium sulphate solution is mixed with 250cm of 0.2 molar KCI solution. The molar concentration of K ions is:

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0.2 molar

0.25 molar

0.3 molar

0.35 molar

All 3d series elements show an oxidation state of oxidation state

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+1

+2

+3

Zero

Which of the following undergoes easy dehydration?

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3-MethyIbutan-2-ol

Ethanol

2.Methylpropan-2-ol

Methanol

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

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180°

120°

90°

60°

The volume of a real gas

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is constant

increases with T decrease

becomes zero at absolute zero

never becomes zero

4.4 g of CO₂ contains how many litres of CO₂ at STP?

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2.4 litre

2.24 litre

44 litre

22.4 litre

Deep sea divers breath air under increased pressure, therefore they use a mixture of

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96% N₂and 4% O₂

96% O₂and 4% N₂

94% N₂and 6% O₂

94% 0₂and 6% N₂

The molarity of 2% W/V NaOH solution is

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2

0.25

0.05

0.5

In order to mention boiling point of water at 110∘C the external pressure should be:-

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between 760 torar an 1200 torr

between 200 torr and 760 torr

765 torr

any value of preessure

Which one is not related with evaporation

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Continuous

Cooling

Exothermic

Spontaneous

The examples of a hexagonal system is

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sugar

graphite(a=b not equal to c) {Alpha =beta. not equal to gamma}

sulphur

diamond

London forces are more affective at

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low temperature

high temperature

low pressure

low temperature and high pressure

By convention, the standard heat of formation of all elements is assumed to be

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Zero

positive

Negative

Infinity

How temperature affects the electrical conductivity of metals?

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Does not change at all

Decreases with increasing temperature

Increases with increasing temperature

Decreases with decreasing temperature

Which of the following is a strong acid

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CH3COOH

C2H5OH

HCOOH

Phenol

The boiling of water may be 120°C, when the external pressure is

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greater than 760 torr

less than 760 torr

equal to 760 torr

variable

what is it difficult to cook food at high as compared to at sea level? Choose the correct reason.

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H-bonding in H₂O changes with height

temperature at the top of mountain is low

density of water decreases at the mountain

boiling point of water decreases at the mountain

Amount of heat absorbed when one mole of a solid melts into liquid form at its melting point is called:

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heat of vaporization

latent heat of fusion

molar heat of fusion

molar heat of sublimation

Which of the following compounds is not known?

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SbCl

NCl3

Nl3

NCl5

When vapour pressure is equal to atmospheric pressure than it is called

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Evaporation

M.P

B.P

Freezing point

The protein component of enzyme ls called

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apoenzyme

proenzyme

holoenyme

co-enzyme

Gases are effused through a whole due to ______ motion

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Vibration

Rotaional

Translational

Chaotic

When the temperature is raised, the viscosity of the liquid decreases.This is because of

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Decreased volume of the solution

Increase in temperature increases the average kinetic energy of molecules which overcome the attractive force between them

Decreased covalent and hydrogen bond forces

Increased attraction between the moelcules

The vapour pressure of a liquid depends upon

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amount of the liquid

surface area

temperature

size of container

Which element exists as discrete small molecules in the solids state

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Aluminum

Silicon

Iodine

Sodium

The Complete oxidation of ethanol produces first Ethanal than

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Ethanal

Propanone

Ethanoic acid

Benzoic acid

Air at sea level is dense.This is a practical application of

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Boyle's law

Charle's law

Avogadro's law

Dalton's law

Air contains 78% N₂, 21% O₂ and 1% other gases at sea level the partial pressure of O₂ is

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760 torr

159 torr

592 torr

7.6 torr

Enzymes consist of

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proteins only

proteins and non-protein parts

fats only

futs and non-fatty components

Pressure of 1Nm^-2 is equal to

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One bar

1 psi

One pascal

One atmosphere

A basic buffer solution can be prepared by mixing?

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Weak acid and its salt with strong base

Weak base and its salt with strong acid

Strong acid and its salt with weak base

Strong base and its salt with strong acid

Formalin is used as:

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Fungicide

Germicide

Sterilizing of surgical instruments

All three

Which of the following govern the diffusion of gases

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Dalton's law

Avogadro's law

Graham's law

Newton's law

Which of the following alcohol is more soluble in H2O

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Propanol

Butanol

Pentanol

Hexanol

London dispersion forces are also called

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Ion-dipole forces

Dipole-induced dipole forces

Dipole-dipole forces

Instantaneous dipole induced dipole forces

Lattice energy is also termed as

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ionization

crystal energy

dissociation

bond energy

Enthalpy of a reaction can be measured by

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Glass calorimeter

Barometer

Manometer

Thermometer

If the reaction "P+Q→R+S' is deseribed as being of zero order with respect to P, it means that

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P is catalyst in this reaction

P molecules do not possess sufficient energy to react

The concentration of P does not change during the reaction

The rate of reaction is independent of the concentration of P

The number of atoms in 0.004 g of magnesium is close to

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24

2 x 10²⁰

10²⁰

6.02 x 10²³

Which of the following gases diffuse quickly:

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N₂

NH₃

CO₂

Cl₂

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

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T₁= T₂= T₃

T₁< T₂< T₃

T₁> T₂> T₃

T₁> T₂= T₃

If the number of gas molecules are doubled in the certain volume the pressure is:

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Increased to four times

Remains unchanged

Doubeld

Decrease to half

The hexagonal closed packing is associated with

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Ag, Cu, Au

Zn, Cd, Hg

Li, Na, K

NaCl, KBr

The state of matter which exist only within a relatively narrow range of temperature and pressure

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Solid

Gas

Liquid

Plasma

Bond will be covalent when electronegativity difference of bonded atom is

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Equal to 1.7

between 0.5 to l.7

Greater to 1.7

zero

Which one of the following will behave least like an ideal gas at high temperature and low pressure?

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hydrogen fluoride

helium

oxygen

carbon dioxide

Which one of the following elements is not an alkali metal?

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Na

Sr

Cs

Rb

Total pressure of mixture of two gases is:

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The ratio of their partial pressure

The product of their partial pressure

The difference partial pressure

The sum of their partial pressure

An element from the given below exists as discrete small molecules in the solid state. Which is that?

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Sodium

Silicon

lodine

lron

If a reaction involves only solids and liquids, which of the following is true?

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ΔH = ΔE

ΔΗ =ΔΕ

ΔH>ΔΕ

AH =AE +nRT

Equal masses of CH₄and O₂are mixed in a 10 dm³container at 25°C. The partial pressures of CH₄and O₂are in the ratio of

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1 : 2

2 : 1

1 : 1

2 : 3

Atoms having same mass number but different atomic numbers are called.

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Isotopes

isobars

Isotones

isomers

Which one of the following has zero dipole moment

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NH3

CHCI3

H2O

BF3

The energy difference of d-orbitals varies from

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Atom to atom

lon to ion

Electron to electron

proton to proton

If temperature is 73K and volume is 146 cm3 then calculate the value of K=V/T

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5

4

3

2

Primany aleohols sornally give us aldehyde when oxidized in the presence of acidified Na2Cr2O7, what will be the product, when the secondary alcohols are oxidized in same condition?

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Alkenes

Alkyl halide

Alkynes

Ketones