Question # 1

What is the mass of 10²⁰molecules of CO₂at STP?

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7.3 x 10^-3g

7.9 x 10^-3g

3.2 x 10^-3g

4.9 x 10^-3g

Which of the following molecules have a permanent dipole

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CH₄

CHCl₃

CCl₄

CO₂

All are dicarboxylic acids except

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Oxalic acid

Malonic acid

Picric acid

Tartaric acid

Rise in vapour pressure of water from 30 to 60°C is only 32 torr to 149.4 torr (117.4 torr) but from 60 to 90°C is 149.4 to 527.8 torr (378.4 torr).it is due to

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change in geometry of H₂O molecules at higher temperature

decrease in volume takes place at higher temperature

vapour pressure of liquids increases rapidly closer to their boiling points

boiling starts

The standard reduction potential of Zinc is

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0.76V

0.34

-0.34V

-0.76V

Fe+2 is the co-factor for

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Chrome oxidase

Glucose-6-phosphatase

Carbonic anhydrase

Hydrolase

Which pair of following pair is metalloid?

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Antimony and bismuth

Phosphorous and arsenic

Nitrogen and phosphorous

Arsenic and antimony

^{Reaction of ethyl bromide with ammonia}

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Completes in a single step

Completes in two steps

Continues till N is left with no lone pair

is reversible

Ethyl alcohol reacts with PCL and produces:

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Haloalkane

Alkyl halide & H3PO3,

Alkyl halide & POCl3

Alkyl halides &H3PO4.

A compound that has a nucleophilic carbon?

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C2H2

C2H4

C3H8

C6H6

Acetaldchyde and ketone form addition product with

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Phenyl hydrazine

Hydroxylamine

Hydrazine

hydrogen cyanide

NH³ shows a maximum boiling point among the hydrides of V-A group elements due to :

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very small size of nitrogen

lone pair of electrons present on nitrogen

enhanced electronegative character of nitrogen

pyramidal structure of NH³

One degree on Celsius scale is ______ time greater then Fahrenheit scale

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9/5

5/9

6/5

5/6

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

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remains unchanged

increases unchanged

reduces to 1/4

increases 4 times

Strong dipole-dipole forces among the liquid molecules are responsible for

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very high heat of vaporization

very low heat of vaporization

cannot be predicted

negligible forces are these

In [Ti (H2O)]3+ which colour is transmitted

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Yellow

Blue and red

Blue and yellow

red and yellow

In which of the following Equilibria will Kc and Kp have not the same value

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2HI <--------> H2+I2

2SO2 + O2 <--------> 2SO3

N2 + O2 <---------> 2NO

All of these

Propanone does not undergo

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Oxime formation

Reduction of Fehling solution

Hydrazone formation with hydrazine

Reaction with HCN

Real gases deviate at low temperature from ideal behaviour due to

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there is transitional motion of molecule

the collissions between the molecules are decreased

volume of gas is decreased

the inter molecular attractive forces become significant

Which is correct?

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1 mm Hg = 1 torr = 1 atm

1 mm Hg = 760 torr = 1 atm

760 mm Hg = 760 torr = 1 atm

760 mm Hg = 1 torr = 1 atm

The molecules of air don't settle down. This is due to:

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non-polar nature of gases

different molar mass

elastic collisions of gas molecules

pressure of dust particles in air

In proteins, the alpha-helix and Beta-pleated sheet are examples of

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^{Primary Structure}

Secondary Structure

Tertiary Structure

Quaternary Structure

Octyl acetate has the flavor of

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Orange

Pineapple

Banana

Apple

Enthalpy of neutralization (∆H°n) per mole of H2SO4/ Ba(OH)2 is

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+57.4 kJmol-1

-114.8 kJmol-1

-57.4 kJmol-1

Cholestryl benzoate tums into milky liquid at

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140°C

145°C

148C°

149°C

The solubility of Fe(OH)3 is 'x' mole per dm3. Its Ksp would be

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9X3

3X4

27X4

9X4

The rate of diffusion of a gas is proportional to

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P /√d

√p/d

P/d

√ P/d

The formation of acetic anhydride from acetic acid follows the mechanism

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SN

AN

SE

AE

All 3d series elements show an oxidation state of oxidation state

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+1

+2

+3

Zero

A solid has a sharp melting point slightly above room temperature and is a poor thermal and electrical conductor, its crystal classification by bond type is

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Ionic

Metallic

Molecular

Covalent

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

The units of ionic product of H2O is

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Mole dm-3

Mole2 dm-6

Mole-1 dm-3

Mole-2 dm-6

Which of the following reactants will be required to form ethene from ethyl chloride

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_{Alcoholic KOH}

Alkaline KMnO4

Aqucous KOH

Aqucous NaOH

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 number of atoms in 0.004 g of magnesium is close to

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24

2 x 10²⁰

10²⁰

6.02 x 10²³

A molecule that has polar bonds but is overall non - polar

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IF

CCl4

PCI3

All

Ionic crystals are brittle because

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they have cubic geometry

they are bad conductors of electricity

coordination number of cations and anions is same

cations and anions are arranged in alternate positions in layers

A gas is heated in a closed vessel. Which of the following statement is not true for the gas?

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the intermolecular forces between particles weaken

the kinetic energy of particles increases

the total internal energy of the gas remains constant

the total internal energy of the gas increases

The general electronic configuration of group IV-A elements is

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ns2, np6

ns2, np4

ns2, np3

ns2, np2

A basic buffer solution can be prepared by mixing?

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Weak acid and its salt with strong base

Weak base and its salt with strong acid

Strong acid and its salt with weak base

Strong base and its salt with strong acid

The cell which converts electrical energy to chemical energy is called

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Electrochemical cell

Voltaic cell

Galvanic cell

Down's cell

Polarizability is responsible for intermolecular forces and it

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increases down the group

decreases down the group

almost remains the same

increased along a period

Which one of the following molecules show maximum hydrogen bonding?

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H₂O

H₂Se

H₂S

HF

Ethane when completely halogenated in excess of chiorine can form

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Hexachloroethane

Dichloroethane

Pentachloroethane

1.1.2.2-terachloroethane

Which of the following is not the application of plasma

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Fluorescent light bulb

Removal of hazardous chemical

Neon signs

Corrosion effective

Hydrogen bonding is involved in

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Solubility

Detergents

Biological molecules

All the above

A compound X has all of the properties below. It is a liquid at 25°C it mixes completely with water it reaets with aqueous sodium hydroxide, What could X be?

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_{Ethanoic acid}

Ethene

Ethanol

Ethyl ethanoate

Substance that does not show the process of sublimation is

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K2Cr2O7

iodine

naphthalene

NH4CI

One atmosphere is equal ___________ Pascal

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760

101325

14.7

1.01325

In NaCl cyrstal Na⁺ion is surrounded by how many ions of Cl^-

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4

6

8

10

Indicate the number of open chain isomers of C6H14

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4

5

6

7

Equal masses of CH₄and O₂are mixed in a 10 dm³container at 25°C. The partial pressures of CH₄and O₂are in the ratio of

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1 : 2

2 : 1

1 : 1

2 : 3

Grey tin crystals belong to

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tetragonal

cubic

orthorhombic

rhomtrohedral

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

The number of Na+, ions which surround each Cl- ion in the NaCl crystal lattice is

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8

12

6

10

What is the formula of talc or soapstone?

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Na2B4O7.10H2O

H2Mg3(SiO3)4

Cu2S

NaNO3

Which of the following has the lowet solubility in water

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НСOOH

CH3СООН

CH3-CH2-СООН

C3H7-COOH

Evaporation occurs at all temperatures and is effected by

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surface area

temperature

intermolecular forces

all of these

Vapour pressure of a liquid is more if

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the intermolecular forces between the molecules of the liquid are strong

the intermolecular forces between the molecules of the liquid are weak

more liquid is present in a container

liquid has more surface area to evaporate

Boiling point of water remains 100°C although heat is continuous supplied. it is because

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decomposition of water takes place

hydrogen bonding is increased

external atmospheric pressure is not changing

kinetic energy of H₂O molecules is increasing

Which of the following is not heterocyclic compound?

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Naphthalene

Furan

Pyridine

Pyrrole