Question # 1

The pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature and still at higher temperature turbidity completely disapp-ears.The behaviour is a characteristic of substance forming

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Allotropic crystal

Liquid crystals

Isomeric crystals

Isomorphous crystals

Which of the following compound is least reactive

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HCHO

CH3CHO

CH3COCH3

C6H5CHO

What is the formula of clay?

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Asbestos

Talc

H2Al2(SiO4)2.H2O

Na2SiO3

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

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

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

In an electrochemical series, elements are arranged on the basis of

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pH scale

pKa scale

pOH scale

Hydrogen scale

Vapour pressure of a liquid

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increasing with increase of temperature

increases with decrease of temperature

increases with size of container

increases with volume of liquid

Substituted phenyl group are called

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Arene groups

Alkyl groups

Aryl groups

Acyl groups

A crystal system in which the unit cell has different all cell lengths but all angles equal to 90° it is called as

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orthorhombic

triclinic

monoclinic

cubic

Someone is saying that glass must be a super cooled liquid. The reason that he might have in his mind is that glass has :

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definite shape

definite-volume

crystalline structure

no crystalline structure

Evaporation of liquid takes place at every temperature. What when temperature becomes constant?

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the rate of condensation is greater than teh rate of condensation

it depends upon the nature of the liquid

rate of evaporation is greater than the rate of condensation

the rate of condensation and evaporation become equal

In dilatometric method is directly proportional to extent of reaction

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Change in concentration

Change in pressure

Chang in volume

Change in temperature

Which type of motion is exhibited by gases?

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Vibrational

Transitional

Rotational

All of them

Octyl acetate has the flavor of

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Orange

Pineapple

Banana

Apple

The ratio of close packed atoms to tetrahedral holes in cubic close packing is

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1 : 1

1 : 2

1 : 3

2 : 1

The solid particles posses only ______ kinetic energy

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Translational

Rotational

Viberational

Circular

Glass is a

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Micro-crystalline solid

Super-cooled liquid

Gel

Polymeric mixture

Variable Oxidation state of is related to transition elements

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empty d-subshells

Completely filled

Partially filled d-subshell

d-d transition

Moles of protons in 20g of SO3

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10

20

40

80

Elements of group IA and IIA are

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electronegative

neutral

electropositive

non-metals

Under what conditions do real gases show close to ideal gas behavior?

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low pressure, low temperature

high pressure, low temperature

low pressure, high temperature

high pressure, high temperature

which of the following is not a symmetrical ketone

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4-heptanone

Butanone

Propanone

3-pentanone

Which of the following is a non-typical transition element?

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Cr

Zn

Mn

Fe

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

The electrochemical series is based on

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pH scale

Redox scale

Hdrogen scale

Arrhenius scale

As gases can adopt the shape of the container. Therefore gases have:

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different shapes

fixed shapes

no fixed shapes

definite shapes

The height of the peak in the mass spectrum shows

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Number of isotopes

Relative abundance

Mass number

Number of protons

When we dissolve 15.8 g of KMnO4 in 1000g of H20. The solution is

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, 0.1 M

0.1 M

0.2 M

Out of monochloro, monobromo and mongiodo derivatives of ethane, the mos reactive compound towards nucleophilic substitution will be

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C2H5Br

C2H5Cl

C2H5I

All are equally reactive

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

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Acetone

Water

Ethanol

Acetic acid

Naturally occurring isotopes of silver are

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,Two

, Four

, Forty seven

, sixteen

Equal volumes of all gases at STP contain equal no of molecules is called

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Dalton's law of partial pressure

Graham'a law of diffusion

Avogadro's law

None

What is true about an alcohol and phenol

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Both are more acidic than water

Both react with NaOH

Both produce CO2 with Na2CO3

Both, produce H2 with Na

Buffer action can be explained by except

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Common ion effect

Le-Chatelier's principle

Law of mass action

Solubility product

In a period the atomic radii

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increase

decrease

remain same

first increase, then decreased

d-d transition cannot be observed in

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Cr

Cu

Mn

Zn

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

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Na

Sr

Cs

Rb

For a gas the isotherm is the graph between

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V and T

T and P

n and T

P and V

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

Which state about gases is not correct?

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They spread throughout the vessel.

Pressure is due to collision.

There are larger spaces between the molecules.

Molecules are arranged regularly.

According to charles law there will be a change in the volume of a given mass of a gas by 1/273 of its original volume at 0°C if the temperature of the gas is changed by

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10°

1°C

100°C

2°C

A covalent bond may be

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100% covalent

Partial ionic

100% ionic

Both a and b

Which of the following configurations corresponds to alkaline earth metals?

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[Ar] 3d10, 4s2

[Ne] 3d2, 3p2

[Ar] 4s2

[Ar], 3d10, 4s1

Units of van der Waals constant a is

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atm dm⁶/mol² & Nm⁴/mol²

atm dm⁴/mol² & Nm⁴/mol²

atm dm⁴/mol² & Nm⁶/mol²

None of these

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

Pressure remaining constant, at which temperature the volume of a gas will become twice of what it is at 0°C

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546°C

200°C

546 K

273 K

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

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2

3

4

5

A mixture of H₂, H2 and CH₄has total number of 0.51 mole and total pressure of 1 atmosphere. If the mass of H₂is 0.8 gram, then its partial pressure is

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0.4 atm

0.6 atm

0.776 atm

0.667 atm

Hardness of diamond is attributed to the

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strength of the ionic bonds in the structure

three-dimensional network of covalent bonds

absence of valence electrons in carbon atoms

The general electronic configuration of group IV-A elements is

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ns2, np6

ns2, np4

ns2, np3

ns2, np2

Which is an intermediate in Svl

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Ethoxide ion

Alkene

Alkyl halide

Carbocation

Which one of the following molecules show maximum hydrogen bonding?

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H₂O

H₂Se

H₂S

HF

The value of R is SI units is

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0.0821 dm³. atm. J^-1mole^-1

62.4 dm³torr K^-1mole^-1

8.31 dm³atm. K^-1mole^-1

8.31 JK^-1mole^-1

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

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Magnesium

Zinc

Copper

Sodium

What are the conditions under which the relation between volume (V) and number of moles (n) of gas is plotted? (Pressure; T-temperature)

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constant P and T

constant P and V

constant T and V

constant n and v

Which attractive forces cause molecular solids to be formed?

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lonic

Metallic

Covalent

van der Waals

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.

The molecules of CO₂is dry ice form the

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ionic crystals

covalent crystals

molecular crystals

any type of crystal

The most suitable temperature for preparing ammonia gas is

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250℃

450℃

350℃

550℃

Covalent bonds are

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directional

Bidirectional

Multidirectional

Non directional