Question # 1

The best concentration unit used for K⁺ ions present in potable water is

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ppm

Mole fraction

Molarity

Molality

In order to determine ∆H (latt) of ionic compound which is correct relationship

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∆H latt. = ∆Hf - ∆Hx

∆H latt. = ∆Ha + ∆Hv

∆H latt. = ∆Hf + ∆Hx

∆H latt. = ∆Hf - ∆H sol.

The number of atoms or molecules whose concentrations determines the rate of a chemical reaction is called the

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Molecularity of the reaction

specific activity of the reaction

Order of the reaction

rate constant of the reaction

One kilo calorie is equal to

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4.184J

1000J

4184J

1kJ

In the reaction A+B→ Products, if B is taken in excess, then it is an example of

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Second order reaction

zero order reaction

Pseudo first order reaction

first order reaction

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

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Hydrolysis

Oxidation

Reduction

Redox

Dipole-induced dipole forces are also called

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dipole-dipole forces

ion-dipole forces

Debye forces

London-dispersion forces

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

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Propyne

Propanal

Propene

Propane

A gas has non-ideal behaviour at:

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high temperature and high pressure

low temperature and low pressure

high temperature and low pressure

low temperature and low pressure

The strongest conjugate base is

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OH-

CH3O-

C6H5O-

CH3COO-

An example of ion-dipole force is the solution of:

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bromine inbenzene

ethanol is water

NaCl in water

glucose in water

S.I units for measurements of pressure

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Pascal

mm of Hg

atm

Torr

Joule is a unit of energy which is defied as

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Kgm^-2s^-2

Kgm²s^-1

Kgms^-2

Kgm²s^-2

C-H bond length in the benzene is

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0.99A°

1.09A°

1.12A°

1.34A°

In order to mention boiling point of water at 110∘C the external pressure should be:-

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between 760 torar an 1200 torr

between 200 torr and 760 torr

765 torr

any value of preessure

If increase in temperature and volume of an ideal gas is two times, then the initial pressure P changes to

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4P

P

2P

3P

The volume of a gas that is occupied by its one mole at S.T.P. is known as:

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atomic volume

molar volume

normal volume

total volume

Ti+3 shows minimum absorption (maximum transmittance) at-------and-------wavelength

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Yellow, Green

Red. Yellow

Blue. Green

Red. Blue

Which reactant does hnof liberate water on reaction with alcohol

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NH3

K2Cr2O7/15H2O

HCI

PCI3

Moles of protons in 20g of SO3

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10

20

40

80

What is correct about heat of combustion

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It is applicable to gaseous substances only

It is always negative

It is always positive

It is positive in some cases while negative in other

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

2,5-dimethyl-1-hexene has

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Two sp2 hybridized carbons

Six sp2 hybrid carbons

Two double bonds

Four pi electrons

Identify the compound, which give iodoform test

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Methanol

3- Hexanol

Methyl ketone

Propionaldehyde

Benzene in the presence of AICl3 produces acetophenone when reacts with

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AcetyI chloride

EthyI benzene

Acetic acid

Ethanoic acic

In elimination reaction i.e, in the formation of alkene, the reactivity of alkyl halide is in the order:

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CI>Br>I

I>Br>Cl

Br>CI>I

I>CI> Br

Number of H+ ions when 0.1 mole of sulfuric acid is completely ionized in water

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4x6.022x10ê23

1×6.022x10ê23

2x6.022 x10ê23

2x6.022x10ê22

The motion imparted to the gas molecules by gravity is

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very small

very large

negligible

appreciable

Smell of cooking gas during leakage from gas cylinder is detected because of the property of:

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Effusion

Evapotration

Diffusion

Conduction

Which of the following solids has a simple molecular lattice?

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magnesium oxide

sodium

silicon(IV) oxide

sulphur

Soda lime is often employed to remove both

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H2O and NO2

CO2, and NO2,

H2O and CO2

H2S and CO2

Which of the following statements is false?

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Avogadro number = 6.02 x 10²¹

The relationship between average velocity (v) and root mean square velocity (u) is v = 0.9213 u

The mean kinetic energy of an ideal gas is independent of the pressure of the gas

The root mean square velocity of the gas can be calculated by the formula (3RT/M)^1/2

The compressibility factor of an ideal gas is

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0

1

2

4

When graph is plot between P and 1/V at constant temperature. A straight line obtains which move toward ______ when temperature increase

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Pressure axis

Volume axis

1/V axis

1/P axis

The ionization energy of hydrogen atom is

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Zero

131.3kJmole

13.13kJ/mole

1313kJ/mole

Which statement explains why the boiling point of methane is higher than that of neon?

[A_r:H.1:c,12:Ne,20]

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A molecule of methane has a greater mass than a molecule of neon

Molecules of methane form hydrogen bonds but those of neon do not

Molecule of methane have strongel intermolecular forces than those of neon

The molecule of methane is polar, but that of neon is not

Which of the following compound is least reactive

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HCHO

CH3CHO

CH3COCH3

C6H5CHO

The critical temperature of CO₂______°C at 73 atm critical pressure

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21.142

28.892

31.142

35.452

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

Which compound is not formed as a result of reaction between acetic acid & HI & red phosphorous

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Ethanol

Water

lodine

Ethane

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

Which pair of molecules have debye force

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Ne and Ne

Argon and water

Na⁺ion and water

Water and water

During esterifcation, the alcobol molecule acts as:

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Oxidizing agent

Electrophile

Reducing agent

Nucleophile

An ideal gas expands according to PV=constant. On expansion, the temperature of gas

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will rise

will drop

cannot be determined because the exteral pressure is not known

will remain same

The kinetic theory of gases predicts that total kinetic energy of a gaseous assembly depends on

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Pressure of the gas

Temperature of the gas

Volume of the gas

Pressure,temperature,and volume of the gas.

The ideal gas law holds best under the conditions of

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high pressure and high temperature

low pressure and high temperature

low pressure and low temperature

high pressure and low temperature

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

In Boyle's law which of the following pair is variable:

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Temperature and quantity of a gas.

Pressure and volume.

Volume and quantity of a gas.

Pressure and quantity of a gas.

The highest temperature at which gas can be liquefied and above which liquefaction is impossible is called

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Boiling temperature

Upper consulate temperature

Transition temperature

Critical temperature

Carboxylic acids reacts with sodium carbonate, & gas evolved in this reaction

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CO2

H2

CO

Both a &b

In the presence of hot alkaline potassium permanganate solution 2-butene will give

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Formic acid +acetic acid

Two moles ethanoic acid

Two moles of methanoic acid

Ethylene glycol

The nature of crystals formed due to London forces of interaction are

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molecular

metallic

ionic

covalent

Geometry of NH3 is

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^Tetrahedral

Square planer

Pyramidal

Linear

Which is most acidic?

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H2O

C2H5OH

C4H9OH

CH3-CH2-CH2OH

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

According to kinetic molecular theory, kinetic energy of molecules increases when they are:

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melted from solid to liquid state

frozen into a solid

condensed into liquid

mixed with other molecular at low temperature

Haemoglobin molecule is how many times heavier than helium atom

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68000 times

17000 times

,34000 times

, 1700 times

Which one of the following is not a form of chemical bonding?

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covalent bonding

hydrogen bonding

ionic bonding

metallic bonding

Rate of which reaction increases with temperature?

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Exothermic and endothermic reactions

Endothermic reactions

Exothermic reactions

None of these

In all oxidation reactions, atoms of an element in a chemical species lose electrons and increases their

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Oxidation states

Reduction states

Electrode

Negative charges

How many electrons have to be removed to ionize 1.0 x 10(-6) moles of Ne atoms to Ne+ ions in a neon advertising tube:

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6.02x10ê23/1.0x10ê-6

1.0x 10ê-6 x 6.02x 10ê23

1.0x10ê-6 x 6.02×10ê23/20.2

1.0x10ê-6 x 6.02x10ê23/9.65x10ê-1