Question # 1

NaOH+HCI- NaCI+ H2O. Enthalpy change in the above reaction is called

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Enthalpy of reaction

Enthalpy of Neutralisation

Enthalpy of formation

Enthalpy of combustion

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

Molten lead and iead (II) bromide both conduct electricity. Which one of the following statements relating to this is true?

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Both undergo chemical change when they conduct

Both conduct by the movement of charge particles

Both will also conduct in the solid state

Both contain mobile electrons

Lithium differs from rest of members of its group due to which of following reasons

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High E.N of Li+1

Small radius

High charge density

All above are correct

The basic distinction between solids, liquids and gases lies in difference between.

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Strength of the bonds

Size of molecules

space which the molecules occupy

All of above

Pressure remaining constant at which temperature the volume of a gas will become twince of what it is at 0∘C.

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546∘C

200∘C

546K

273K

Geometry of NH3 is

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^Tetrahedral

Square planer

Pyramidal

Linear

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

The structure normally associated with ionic bonding is:

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a giant lattice

a simple molecule

a giant molecule

a regular arrangement of ions surrounded by a sea , or cloud, of electrons

At absolute zero the molecules of hydrogen gas will have

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Only translatioral motion

Only vibrational motion

Only rotational motion

All the motion are ceased

Which reagent is responsible for the conversion of ketone to secondar alcohul

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NaAlH

NaBH4

Al

Red P

The hydrocarbon with maximum B.P is

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CH4

C6H14

C4H10

C2H6

Which of the following does not represent a type of crystal system

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Triclinic

Monoclinic

Rhombohedral

Isotropical

Triple point of water is

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273 K

373 K

203 K

193 K

The temperature of the gas is raised from 27°C to 927°C the root mean square velocity is

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√927/27 times the earlier value

Same as before

Halved

Doubled

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

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one bar

one pascal

stalagmometer

one aomosphere

The curve which is obtain from Boyle's law is called as

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Isochoric

Isotherm

Adiabatic

All of these

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

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CCI4

CO2

CO

CH4

If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of the gas will

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remain unchanged

increase four times

reduce to 1/4

be doubled

Which of the following is an example of body centred cube?

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Magnesium

Zinc

Copper

Sodium

The original volume of a gas at 0° is 273 cm³at constant pressure, its volume at 273°C becomes

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zero cm³

546 cm³

446 cm³

346 cm³

Estyl butyrate has flavour like

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Banans

Jasmine

Pineapple

Orange

At equilibrium, the concentration of reactants and products are

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Constant

Maximum

Different

Equal

The products of electrolysis of which of the followings are known

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Fused electrolyte

Aqueous solution of eleetrolyte

Solid electrolyte

Solid metal

Metals are good conductor of electricity, but their conductivity decreases by increase in temperature because

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electrons attracted strongly by the nuclei which resists their free motion

atoms form ionic bond and no free electrons

electrons go to the iocalized orbital not free

positive metal ions begin to oscillate and their motion hinders the free movement of electrons

The temperature of a gas is directly proportional to its

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average translational kinetic energy

enthalpy

internal energy

hydration energy

Which one of the following is an appropriate indication of positive iodoform test?

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Formation of H2O

Brick red precipitate

Release of H2 gas

Yellow precipitate

Which is an intermediate in SN1 reaction

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Ethoxide ion

Carbocation

alkyl halide

alkene

SN2-reactions can be usually observed in

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Primary alkylı halide

secondary alkyl halide

Tertiary alkyl halide

Both A. and B

When stress is applied to the metals, the metals are malleable and ductile because

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their layers slip pass each other

atoms lose electrons

mobility of electrons increased

none of the above

The diffusion of gasses at absolute zero will be:

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Slightly decrease

unchanged

Slightly increased

Zero

For an endothermic reaction, enthalpy of reactants

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Is smaller than that of the products

Is greater than that of the products

Must be greater or smaller than that of the products

Is equal to that of the products

The nature of the attractive force in acetone and chloroform are

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dipole-induced dipole forces

dipole-dipole forces

ion-dipole forces

instantaneous forces

Alcohols of low molecular weight are:

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Soluble in water

Insoluble in water

Soluble in water on heating

Insoluble in all solvents

One of the following compound reacts with its own oxidation product (an oxidation involves no loss of carbon) to give sweet odour liquid

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Propanal

Propanone

1-propanol

Propanoic acid

The values of ∆H for the process l(g)+e-1--------->
I-1(g) is:

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>0

<0

0

None

In which of the following types of reactions are the carbonyl compounds and alkene are similar in behaviour

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Nucleophilic addition

Electrophilic addition

Nucleophilic suhstitution

Catalytic hydrogenation

Stronger is the oxidizing agent, stronger is the

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emf of cell

Oxidation potential

Reduction potential

The gas which obey's the gas laws at all conditions of temperature and pressure is called:

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Perfect gas

Super gas

Ideal gas

Real gas

Stalagmometer is used to measure

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the resistance to flow of a liquid

capillary action of a liquid

Meniscus of the liquid

surface tension of the liquid

What will be the shape of a molecule which containstwo sigma bond pairs and one lone pair?

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Linear

V shape

Tetragonal

Triangular

Ethanoic acid reacts with all of these to produce water except

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Ethanol

Sodium

Caustic soda

Sodium hydrogen carbonate

Which element differs from rest of elements of its group?

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Ba

Mg

Ca

Be

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

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Acetaldehyde

Propanal

Acetone

Propanoic acic

Image a man is sitting in a room. The room is closed from all sides, no entry no exit of any gas. If the room expands suddenly then:

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he will be frightened

he will feel cool

his blood pressure will decrease

he will feel warmth

Which solids are called true solids

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Crystalline

Vitreous

Amorphous

Metallic

The value of critical temperature of a gas depends upon its:

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Size

Intermolecular forces in it

Shape

All of above

Identify the compound, which give iodoform test

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Methanol

3- Hexanol

Methyl ketone

Propionaldehyde

Alkanes do not show geometrical isomerism due to

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Hyperconjugation

Resonance

Rotation around single hond

Restricted rotation around doubled bond

All gases can be compressed by:

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Keeping constant pressure

Decreasing pressure

Increasing pressure

None of above

Which one of following statement about three about three states of matter is incorrect?

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in solids the particles vibrate about fixed positions

energy is released when a gas turns back to a liquid

particles in gases move in a random manner

the closer particles are together, smaller the force of attraction between them

The enthalpy change AH of a process is given by the relation

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ΔΗ =ΔΕ + P∆V

ΔH=ΔE +W

ΔH =ΔΕ-ΔnRT

ΔΕ =ΔΗ + P∆V

Deep sea divers take oxygen with:

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A heavy gas

A lighter gas

An inert gas

All of above

An amine is produced in the following reaction
C2H5l+2NH3-------C2H5NH2 +NH4l. What is mechanism?

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

Dipole-dipole forces and London forces are collectively called

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hydrogen bonding

Vander Waals forces

Covalent bonding

Ionic bonding

A basic buffer solution can be prepared by mixing

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Strong acid and its salt with weak base

Weak base and its salt with strong acid

Strong base and its salt with weak acid

Weak acid and its salt with strong base

Glass is a

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Micro-crystalline solid

Super-cooled liquid

Gel

Polymeric mixture

Which does not affect vapour pressure

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Nature of liquid

intermolecular forces

Temp

None of these

The mass of 8.5 dm³of oxygen gas at 0.0821 atm and -1°C is

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100 g

10 g

1 g

0.1 g

The Complete oxidation of ethanol produces first Ethanal than

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Ethanal

Propanone

Ethanoic acid

Benzoic acid

At different temperature, the vapour pressure of water is

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different

same

low

high