Question # 1

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

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

When light is exposed to transtion element, then electrons jump from lower orbitals to higher orbitals in

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Orbitals of s-subshell

Orbitals of d-subshell

Orbitals of p-subshell

between different shells

d-d transition cannot be observed in

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Cr

Cu

Mn

Zn

At higher temperature what is true for gases

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pressure is decreased

volume is decreased

number of moles are decreased

KE is increased

The dehydration of ethyl alcohol with concentrated H2SO4 at 140°C gives

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Ethene

Alcohol

Diethyl ether

Carboxylic acid

Octyl acetate has the flavor of

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Orange

Pineapple

Banana

Apple

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

During the electrolysis of Fused NaCI, the products are

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Na and H2

Na and Cl2

Na and O2

H2 and Cl2

The surface formed by the breakage of a crystal is called _____ plane

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Crystal

Unit

Cleavage

None

One Joule is equivalent to

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4.184 cal.

0.4184cal.

1/2 cal.

1/4.184 cal

The formation of acetic anhydride from acetic acid follows the mechanism

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SN

AN

SE

AE

Which of the following is pure substance

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Distilled water

, Sea water

, NaCl (aq)

Brass

1 gram molecule refers to amount in grams

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Equivalent to 1 mole of an atom

Equivalent to 1 mole of a molecule

Equivalent to 1 mole of an ionic species

Of an ionic compound

In which molecule. all atoms are coplanar?

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CH4

BF3

NH3

PH3

Which one of the following has the lowest pH values

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0.1 M HCI

0.01 M HCl

0.1 M KOH

0.01 M KOH

1 gram formula refers to

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Amount in grams equivalent to 1 mole of a atom

Amount in grams equivalent to 1 mole of a covalent compound

Amount in grams equivalent to 1 mole of a ionic compound

Amount in grams equivalent to 1 mole of an ion

The volume of a real gas

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is constant

increases with T decrease

becomes zero at absolute zero

never becomes zero

On ascending the electrochemical series strength as reducing agent

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Increases

Decreases

Remains same

not determinable

There are three different substances argon hydroiodic acid and hydroiodic acid.

the correct sequence in which the boiling point increases is:

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HI > Ar > HCI

Ar < HCI < HI

HI > HCI > Ar

HCI < HI < Ar

1-chloropropane and 2.chlorpropane are isomers of each other, the type of isomerism in these two is called

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Cis-trans isomerisn

Position isomerism

Chain isomerism

Functional group isomerism

Which one is best buffer those have

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pH = pKa

pH > pKa

pOH < pKb

pKa =0

The shielding effect of inner electron is responsible for

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Having no effect on ionization energy

Decreasing ionization energy

Increasing ionization energy

Increasing electronegativity

Which is not mineral of AI?

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Diaspore

Corrundam

Bauxite

Galena

Plaster of Paris is obtained from

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marble

bauxite

gypsum

limestone

The number of reacting molecules whose concentration change during reaction is called

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Activated molecule

Rate of reaction

Order of reaction

half-life

Formula of sodium beryllite is

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Na2B4O7

Na2BeO2

BeONa

Na2B4O7 .10 H2O

When calcium formate and calcium acetate are dry heated they form

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НCOOH

C2H5OH

CH3CHO

HCHO

Which of the following formula is correct for density of any gas

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d = RT/PM

d = PM/RT

d = MT/PR

d = RM/PT

Ice floats on water because

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the hydrogen bonding in ice is stronger than that of in water

empty spaces are left in ice

ice has two-dimensional structure

the bond length of the oxygen and hydrogen bond is different in water and ice

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

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NaAlH

NaBH4

Al

Red P

The largest number of molecules are present in

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3.6 g of H2O

4.6 g of C2H5OH

2.8 g of CO

5.4 g of N2O5

The crystals formed due to London forces of interaction are

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ionic

covalent

molecular

metallic

NH₃gas is liquefied more easily than N₂Hence

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Van der Waals constants a and b of NH₃> that of N₂

Van der Waals constants a and b of NH₃< that of N₂

a(NH₃) > a (N₂) but b (NH₃) < b(N₂)

a (NH₃) < a (N₂) but b (NH₃) > b (N₂)

Enthalpy of a system can be calculated by which of following relationship

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q=ΔΕ

q=m×S×∆T

q=pv

q=m×v×∆T

Which one of the following is not true of metallic bonding?

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it gives rise to excellent electrical conductivity

electrons are following to move throughout the structure

the strength of metallic bonds increases down a group

the strength of metallic bonding affects the boiling point of metals

How many balloons of 0.25 dm³capacity at I atmospheric pressure can be filled from a hydrogen gas cylinder of 5 dm³capacity at 10 atmospheric pressure

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50

90

180

200

Charle's law only obeys when temperature takes in ______ scale

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Celsius

Fahrenheit

Kelvin

Rickey

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

Gases deviate from ideal behaviour at high pressure.Which of the following is correct for non-ideality?

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at high pressure the gas molecules move in one direction only

at high pressure the collisions between the gas molecules are increased manifold

a high pressure the volume of the gas become insignificant

at high pressure, the intermolecular attraction becomes significant

In s solution 7.8 g of benzene ( C6H6 ) and 46g of toluene (C6H5CH3) is present. The mole fraction of toluene is

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1/3

1/5

2/3

5/6

The enzymes that bring about exchange of functional groups like phosphate are called

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Ligases

Lyases

Isomerases

Transferases

Which of the following statement about graphite is not true?

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The coordination number of carbon atoms is 4.

the carbon atoms are arranged layers.

the layers in graphite are attracted to each other weak forces.

the corbon atoms use only three of their four outer electrons for covalent bonding.

Aniline is the derivative of the benzene containing the

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Hydroxyl group

Amino group

Amido group

Imido group

which of the following d blocks element can showthe highest oxidation number is its ompound

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Chromium

iron

Copper

Manganese

An electron with drawing group attached to e-position in phenol

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makes it basic

Stabilises the phenoxide ion

decreases its basicity

allows it to precipitate in aqueous solution

Under which condition CO has the maximum molar volume

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high T and P

Low T and High p

high T and low P

Low T and low P

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

The reaction which is responsible for the production of electricity in the voltaic cell is

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Hydrolysis

Oxidation

Reduction

Redox

Which of the following does not give yellow precipitate with I2+ NaOH

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Acetone

Benzaldehyde

Acetildehyde

Acetophenone

A line parallel to x-axis is obtained when graph is drawn between

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Volume on abscissa & pressure on ordinate

Volume on abscissa & PV on ordinate at all conditions

Pressure on abscissa & PV on ordinate at constant temperature

None of these

The nature of crystal of diamond is

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metallic

molecular

covalent

ionic

Which one of the following molecules show maximum hydrogen bonding?

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H₂O

H₂Se

H₂S

HF

Tertiary alcohols are the easiest to dehydrate because

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They form stable carbocation

They have less hydrogen

They have bigger size

They are polar

The most suitable temperature for preparing ammonia gas is

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250℃

450℃

350℃

550℃

Oxidation of secondary alcohol produces

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Aldehyde

Ketone

Alkyl halide

Ester

One Pascal is equal to

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1 Nm^-2

1 Nm

1 Nm^-1

1 Nm²

Anthracene contains number of fused benzene rings

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1

2

3

4

CH3CH2CH2OH--------A---------B Here B is

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Propyne

Propanal

Propene

Propane

The graph between pressure and volume at constant temperature for gas is:

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Isobaric

Isothermal

Isotherm

None of above

When HCI gas is passed through saturated solution of rock salt, the solubility of NaCl

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Increases

May increase or decrease

Decreases

None of these