Question # 1

Which of the following statements about amorphous solids is incorrect?

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They melt over a range of temperature

They are anisotropic

There is no orderly arrangement of particles

They are rigid and icompressible

The attractive forces which are created due to repulsion of electronic cloud of the molecules are

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dipole-dipole forces

ion dipole forces

instantaneous dipole-induced dipole forces

dipole-induced dipole forces

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

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Celsius

Fahrenheit

Kelvin

Rickey

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

Acetaldchyde and ketone form addition product with

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Phenyl hydrazine

Hydroxylamine

Hydrazine

hydrogen cyanide

Which gas diffuses more rapidly?

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O₂

SO₃

NH₃

H₂

Zinc reacts with dilute acids to liberate hydrogen. This is because:

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Zn2+ ion is a powertul osidising agent than H' ion

H+ ion is a powerful oxidising agent than Zn ion

Zn2+ ion is a powerful reducing agent than H' ion

H+' ion is a powerful reducing agent than Zn- ian

The B.P. of compound is mostly raised by

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dipole-induced dipole interactions

london dispersion forces

intramolecular H-bonding

intermolecular H-bonding

In which of the following compounds hydrogen bonding is not present

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water

ethanol

ether

ammonia

The sole produets of combustion analysis are

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CO2 and NH3

H2O and Mg(CIO4)2

CO2 and KOH

CO2 and H2O

At same temperature which substance has high kinetic energy:

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Liquid water

N₂gas in a container

Solid piece of iron

Solution of alcohol and water

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

Which thermometer will have its reading 273 degrees greater than that of thermometer C?

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A

B

B has 273 degrees greater than A

C has greater reading than all other thermometers

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

NaNO₃and CaCO₃crystals are Rhombohedral isomrophism is due to

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both soluble in water

their cations belong to S block element

same shape of NO₃^-1and CO₃^-2ions which is triangular planar

same number of O atoms

All the Hydrolytic reactions are

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First order

Second order

Third order

pseudo-first order

The conversion of molecules of A to B follows a second order kineties. Doubling the concentration of A will inerease the rate of formation of B by a factor of

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2

4

1/2

1/4

Which of the following reactions are usually slow?

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Neutralization of acids and bases

Displacement Reactions

Organic substitution reaction

Free radical reactions

Gases show uniform behavior towards their:

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Internal conditions.

External conditions.

Internal and external conditions.

None of above.

The concentration of product is increasing from 30 mole/dm3 to 40mol/dm3 in 0.5 sec then rate of reaction will be------moledm-3sec-1

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0

20

15

25

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

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Na

Sr

Cs

Rb

The minimum temperature recorded by Kelvin scale is:

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273K

373K

Absolute scale is unable

0K to record this temperature

Which of the following solid is amorphous

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NaCl

diamond

glass

MgO

Bonding in MgO is an example of

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lonic bond

Polar bond

Covalent bond

Coordination covalent bond

Relationship between volume of a gas and prevailing conditions of temperature and pressure are called

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Gas laws

Equilibrium laws

Rate laws

None of these

Choose the correct equation among the following given by clauslus to understand to behaviour of molecules:

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PV =nRT

C_r.m.s= √3RT/M

d = PM/RT

PV = 1/3mnc^-2

A doubly bonded carbon is

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cannot be sp2 hybridized

can be sp hybridized

can attach with three carbons

can attach with three hydrogens

Which one of the following is a powerful electrophile used to attack on the electrons of benzene ring?

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FeCl2

Cl+

FeCl-4

Cl2

The graph between P onγ-axis and 1/V at x-axis for a given mass of a gas at temperature T is a

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straight line

curved upward

curved downward

circular

The bond angle between any two sp hybrid orbitals is A.109.28°

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107.09°

120°

90°

80°

Lattice energy is also termed as

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ionization

crystal energy

dissociation

bond energy

In the electronic configuration of Cr one electron from 4s sub-shell is transferred to 3d sub-shell because

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The 3d orbital is of lower energy than 4s

The half-filled d-subshell is more stable than 4 electrons having d-subshell

The 4s orbital is of equal energy to 3d orbital

6 unpaired electron make Cr more paramagnetic

The forces of attraction between ions and water molecules are known as

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dipole-dipole forces

London forces

dipole- induced dipole forces

ion-dipole forces

The protein component of enzyme ls called

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apoenzyme

proenzyme

holoenyme

co-enzyme

The vapour pressure of a liquid depends upon

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amount of the liquid

surface area

temperature

size of container

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

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NaAlH

NaBH4

Al

Red P

This is known fact that the molar volumes of different gases at S.T.P. are

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much larger than the molar volumes of liquids and solids

little bit less than the molar volumes of solids

about the same as the molar volumes of liquids

little bit greeter than the molar volumes of liquids

Formation of Picric acid from phenol needs heating, one possible reason for it is

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acidity of phenol

e- donating nature of-OH

acidity of picric acid

e- with drawing effect of- NO2

The alkaline hydrolysis of bromoethane shown below gives alcohol as the product: H3C-CH2-Br-------H3C-CH2-OH

The reagent and the condition used in this reaction may be:

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H20 at room temperature

KOH in alcohol

Ethanol. heat

Dilute NaOH(aq) warm

Which of the following solids has a simple molecular lattice?

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magnesium oxide

sodium

silicon(IV) oxide

sulphur

What is the formula of magnesite?

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PbS

MgSO4. 7H2O

MgCO3

CaCO3

Stronger the oxidizing agent, higher is

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Redox potential

Standard reduction potential

Reduction potential

_{Oxidation potemial}

An alcohol is converted to an aldehyde with same number of carbon atoms as that of alcohol in the presence of K2Cr2O7/H2S04 the alcohol is

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CH3C(CH3)2OH

(CH3)3COH

CН3СН2СН2OH

(CH3)2CHOH

Which of the following is the unit for pressure of a gas in system international

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Nm^-2

mm of Hg

atmosphere

torrr

The number of moles of CO2 which contain 16g of oxygen

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0.25

1.00

1.50

0.50

To prepare ethane by Wurtz synthesis the suitable alkyl halide is

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Ethyl iodide

any alkyl iodide

Ethyl chloride

Methyl bromide

In a crystal a ≠ b ≠ c,a = y 90° and β ≠ 90° it is

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Monoclinic

Rhombic

Trigonal

Tetragonal

Buffer solutions are used in except

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Clinical analysis

Nutrition

Soil science

Qualitative analysis

Which of the following alcohols is least reactive with respect to 0-H bond

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CH3OH

CH-CH2-OH

(CH3)2-CH-OH

(CH3)3OH

choose the best example of diffusion of gases:

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vapour condensing on moist surface

spreading of small from a scent bottle

hot air rising above a candle

bubbling in soda bottle

Reaction of alcohol with hydrogen chloride, in the presence of Zinc chloride yields

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Ketone

Carboxylic

Alkyl halide

Ester

The maximum hydrogen bonding is in:

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diethyl ether

ethanol

water

benzene

Which of the following is not a category of proteins based upon their function?

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genetic

Regulatory

nucleo

structural

The number of molecules in 22.4 dm3 of gas at 0°C and 1 atm are

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6.02×10(23)

6.02× 10(25)

6.02×10(22)

6.02×10(21)

Which impurity makes the shape of NaCl crystal needle like

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MgSO4

urea

glucose

MgCO3

Van der Waal's forces exist in

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Polar compounds

Non-polar

Covalent

All types of atoms and molecules

During the nitration of benzene the nitrating agent is

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NO3

NO2+

NO2-

HNO3

Cyclobutane structure is categorized under

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Aromatic compounds

Aliphatic compounds

Alicyclic compounds

Heterocyclic compounds

An ideal gas cannot be liquefied because:

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It solidify before becoming a liquid

Its critical temperature is always above 0^oC

It is molecule are relatively smaller in size.

Forces operative between its molecules are negligible

The volume of 2.8 g of carbon monoxide at 27°C and 0.821 atm pressure is (R = 0.0821 lit.atm.Mol^-1 K^-1)

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30 L

3 L

0.3 L

1.5 L

Crystals can be classified into

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7 crystal systems

4 crystal systems

3 crystal systems

14 crystal systems