Question # 1

Which attractive forces cause molecular solids to be formed?

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lonic

Metallic

Covalent

van der Waals

NaCI has face centered cubic structure. The Na ion at the face of the unit cell is shared by

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2-unit cells

4-units cells

only one unit cell

8-unit cells

At constant temperature, volume of given mass of gas in inversely proportional to pressure on it. This statement is according to:

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Hook's law

Graham's law

Bolye's law

Charle's law

A student mixed ethyl alcohol with small amount of sodium dichromate and added it to the hot solution of dilute sulphuric acid. A vigorous reaction took place. He distilled the product formed immediately. What was the product?

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Aceton3

Dimethyi ether

Acetic acid

Acetaldehyde

Which of the following is not a property of enzymes?

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extraordinary speciffcity

reversibility of reactions

high efficiency

minimum activity at optimum T

If 250 cm³of hydrogen gas is cooled from 127°C to -73°C at constant pressure then new volume of gas is ______ dm³

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0.25

0.375

0.125

0.0625

The actual volume of gas molecules is considered negligible at following pressures

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2atm

4atm

6 atm

8 atm

The reaction C2H5CI + aqueous KOH---------C2H5OH+ KCI is

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Electrophilic addition

Nucleophilic addition

Electrophilic substitution

Nucleophilic substitution

Choose the gas law which gives relationship between volume and pressure:

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Bolye,s law

Graham,s law

Dalton,s law

Charles,s law

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

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Urease

Zymase

Invertase

Sucrase

According to Boyle's law at constant temperature, the product of pressure and volume of a given mass of gas is:

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a constant

fraction

whole number

a multiple

LiF is a crystalline substance and has

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ionic crystal

metallic crystal

covalent crystal

molecular crystal

Enthalpy of a reaction can be measured by

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Glass calorimeter

Barometer

Manometer

Thermometer

Diamond is a bad conductor because

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it has light structure

it has a high density

there are no free electron present in the crystal of diamond to conduct electricity

it transparent to light

Elements of II-A group are called alkaline earth metals due to the reason that

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they occur in earth only

they form divalent cations only

they have ns2 electronic configuration

their oxides and hydroxides are alkaline in nature and metals are present in earth crust

The enthalpy change for the reaction C2H2 + 5/2 O2 --------> 2CO2 + H2O is known as enthalpy of

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Fomation of CO2

Fusion ofC2H4

Combustion of C2H4

Vaporization of C2H2

solubility of carboxylic acids decreases in water with increase in molar mass because

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Bigger molecules are more polar

bigger molecules have bigger non-polar groups

bigger molecules make more hydrogen bonds

bigger molecules can form lesser hydrogen bonds/molecule

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

In diamond, the carbon atoms are arranged in a

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tetrahedral manner

hexagonal manner

square planar manner

octahedral manner

Sugar crystals belong to the system

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cubic

monoclinic

triclinic

orthorhombic

Reaction of acetic acid with LiAIH4 gives

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Ethanol

Ethanal

Ethane

Ethyl acetate

The number of molecules in one dm³of water is close to:

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6.02/22.4 x10²³

12.04/22.4 x10²³

18/22.4x 10²³

55.6x6.02x10²³

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)

In graphite crystal, carbon is

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sp hybridized

sp²hybridized

sp³hybridized

None

When 2-bromobutane reacts with alcoholic KOH, the reaction is called

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Chlorination

Halogenation

Dehydrohalogenation

Hydrogenation

Glyoxal molecule has?

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two carbonyl groups

One aldehydic and one carbonyl group

Two aldehydic groups

Two carboxyl group

which chlorine compound has bonding that can be described as ionic with some convalent character?

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NaCI

MgCI₂

AICI₃

SiCI₄

Gases are effused through a whole due to ______ motion

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Vibration

Rotaional

Translational

Chaotic

Among the following, which one is nucleophile

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H+

Ca2+

OH-

Na+

Liquids are less common than:

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Solids.

Plasmas.

Gases.

All of above.

In crystal of sodium chloride, a Cl-1 ion present at the corner of cube is shared between how many cubes?

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8

4

6

10

A system absorbs 100 kJ heat and performs 50 kJ work on the surroundings. The increase in internal energy of the system is

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50kJ

100 kJ

150kJ

5000 kJ

Which of the following gives silver mirror with ammonicaT AgNO3

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Benzyl alcohol

Benzene

Benzoic acid

Benzaldehyde

The spreading of ink on blotting paper is due to

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capillary action

hydrogen bonding

intermolecular forces of the ink

intermolecular forces of the ink and paper

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

What is the formula of talc or soapstone?

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Na2B4O7.10H2O

H2Mg3(SiO3)4

Cu2S

NaNO3

Which ion is most polarising?

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AI³⁺

Ba²⁺

Mg²⁺

Na⁺

Which one of the following equations represents the 1st ionization energy of Na?

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Na(s) ---->Na⁺ (g) + e^-

Na(g) --->Na⁺ (g) + e^-

Na(s) --->Na⁺ (s) + e^-

Na (s) + e^- ---> Na⁺ (g)

The volume of gas depends upon the------- moleules

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Size of

Space between

Molecular weight

both a and b

Cholestryl benzoate tums into milky liquid at

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140°C

145°C

148C°

149°C

What is the co-ordination number of face centered cubic structure?

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12

8

6

10

The forces which are present between the ions and the water molecules are known as

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dipole-induced dipole forces

dipole-dipole forces

ion-dipole forces

London dispersion forces

Viscosity of a liquid is measured by

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barometer

thermometer

viscometer

manometer

All of the following substances are crystalline except:

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carbon

ice

plastic

sucrose

Which of the following reagents reaet in same manner with HCHO, CH3CHO andCH3COCH3

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HCN

Cu2(OH)2/ NaOH

Ammonical AgNO3

Cu(OH)2 only

Which of the compounds cannot show positional isomerism?

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Alkanes

Alkenes

Alkynes

Alcohols

Alpha helix and beta pleated sheath are secondary structures of protein which are maintained by

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dipole forces

non-polar interactions

ionic bonds

Hydrogen bonds

in diamond a unit cell is tetrahedral and averall crystai structure is

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face centred cubic

body centred cubic

tetrahedral

hexagonal

Hydrogen bonding is not present in which of following compound?

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Ammonia

Ethanol

Ether

Water

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

Which one the following is not postulated in the kinetic molecular theory of gases

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molecules of all the gases have same size and same mass

molecules are in chaotic motion

all molecular collisions are elastic

the volume of the molecules is negligible

Which of the following is not a correct postulate of the kinetic theory of gases

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the gas molecules are in random motion

the collision between the molecules are perfectly elastic

the average kinetic energies of different gases are equal at a particular temperature

the pressure exerted on the walls of the container is due to intermolecular forces

Air can be distilled fractionally because the constiltuents of the air:

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have different densities

can be liquefied

are gases at room temperature

have different boiling points

The elements for which the value of ionization energy is low can

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Gain electrons readily

Lose electron less readily

Gain electrons with difficulty

Lose electron readily

Hydration of ethene is an example of

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

The existing property of an element in to more than are crystalline state is termed as:

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isomorphism

polymorphism

isotropy

allotropy

At constant temperature, volume of given mass of a gas is inversely proportional to pressure on it. This is statement of

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Charles law

Boyle's law

Hooks law

Grahams law

K2SO4, and K2Cr2O4, are isomorphous solids and exist in

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cubic form

orthorhombic form

trigonal form

tetragonal

Which of the following is a pseudo solid?

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CaF₂

glass

NaCl

all these

Which volume of gas has minimum value

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Apparent volume

Actual volume

Excluded volume

All have equal value

Chloroform (CHCl3) is?

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Primary alkyl halide

Secondary alkyl halide

Tertiary alkyl halide

a liquid