Question # 1

Which of the following laws study the pressure-volume relationship of a gas at constant temperature,we get

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a straight line

a curve with different peaks

straight line parallel to x-axis

a curve called isotherm

Which of the following is a non-typical transition element?

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Cr

Zn

Mn

Fe

Which one of the following elements is most electropositive out of group I -A and II-A group?

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K

Mg

Na

Ca

Which forms metallic crystals

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Cu

NaCI

SO₂

NH₄CI

The hexagonal closed packing is associated with

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Ag, Cu, Au

Zn, Cd, Hg

Li, Na, K

NaCl, KBr

During sudden expansion of a gas energy is needed to overcome the intermolecular:

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Vibrations

Attractions

Repulsions

All of above

The molecules of CO2, in dry ice form the

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covalent crystals

molecular crystals

none of these crystals

ionic crystals

Which of the following is a strong acid

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CH3COOH

C2H5OH

HCOOH

Phenol

Which of the follwing dnes not give brick red precispitate wits Fehling's solution

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Acetaldehyde

Formalin

prorionaldehyde

Acetone

The origin ofacidic nature of alkyne is?

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small size of C

Small size of H

polarity of triple bond

sp hybridization

In a closed vessel a gas is heated from 300 K to 600K The kinetic energy becomes remains

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Double

Same

Half

Four times

The critical temperature of NH₃ is greater than CO₂ due to its:

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Greater polarity

Stable polarity

Lesser polarity

None of above

The ionization energy

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generally increases from left to right in a period

increases from top to bottom in a group

does not change in a period

does not change in a group

At freezing point of water, the density decreases due to

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change of bond angles

change of bond lengths

cubic structure of ice

empty spaces present in the structure of ice

If reactants are conductor of electricity, then method is used to measure the change in concentration of reaction

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Optical rotation

Refractrometric

Dilatometric

Electrical conductivity

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

Structure of CrO4(-2) is'

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triclinic

cubic

octahedral

tetrahedral

Which is the incorrect value of gas constant R?

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2.987 cal k^-1 mol ^-1

3.313 Nmk^-1 mol^-1

62400dm³ atm k^-1 mol^-1

1.10821atm dm3k^-1 mol^-1

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

One mole of SO2 contains

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6.022 x 10(23) atoms of oxygen

6.022x 10 ê23 atoms of sulfur

18.1x 10 (23) molecules of SO2

4 g molecule of SO2

Which one of the following is not true relationship

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Temperature required for the dehydration of ethanol into ethene in the presence of HaSOu is

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130°C

170°C

175°C

180°C

At constant temperature when pressure of a gas is plotted against volume, the curve is:

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Slanting straight line.

Parabolic.

Straight line, parallel to pressure axis.

Of neither type.

There is more deviation in the behaviour of a gas from the ideal gas equation PV = nRT

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At high temperature and low pressure

At low temperature and high pressure

At high temperature and high pressure

At low temperature and low pressure

To cook the food at a high mountain is difficult as compared to at sea level. The reason is that:

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the temperature at the top of the mountain is low

the density of water decreases at the mountains

the boiling point of water decreases at the mountain

the hydrogen bonding in water changes with the change of height

At what temperature, would N₂molecules have the same average speed as He-molecules at 300 k?

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1100 K

2100 K

420 K

None

Which of the following may be called as London dispersion forces?

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instantaneous dipole-induced dipole forces

dipole-dipole forces

ion-dipole forces

dipole-dipole forces

A molecule which contains two lone pairs and two bond pairs of electrons in valence shell of central atom, geometrical shape of molecules will be

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Tetrahedral

Trigonal pyramidal

Angular

Linear

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

The number of Cl- ions per unit cell of NaCl are

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6

4

2

8

The rate of diffusion of a gas is inversely proportional to:

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Density of a gas

Velocity of the gas

Viscosity of the gas

All of above

Which of the following is a pseudo solid?

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CaF₂

glass

NaCl

all these

Which of the following bonds is not present in NH4CL

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lonic bond

Covalent bond

Co-ordinate covalent bond

De-localized covalent bond

A substances has M_r74.5, a melting point of 772°C and a boiling point of 1407°C. It conducts electricity only when in the liquid state.What is the bonding present in this substances?

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covalent

ionic

metallic

hydrogen bonding

Higher the surface area available for reaction

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slower the reaction

faster the reaction

constant the reaction

lower the Ea

Covalent bonds are

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directional

Bidirectional

Multidirectional

Non directional

The lattice energy of NaCl is

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787 j/ mole

790 kj/mol

780 kJ/ mol

-787 kI / mole

In a given system, water and ice are in equilibrium, if the pressure is applied to the above system then

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Morc ice is formed

Amount of ice and water will remain the same

more ice is melted

both A and B

Ethene C₂H₄and N₂gases diffuse at the same rate at room temperature. it is due to the reason

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these are non polar gases

their molecular masses are same

both are covalent molecules

both have multiple bonds

A basic buffer solution can be prepared by mixing

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Strong acid and its salt with weak base

Weak base and its salt with strong acid

Strong base and its salt with weak acid

Weak acid and its salt with strong base

pi-bond can be formed by sideways overlap of

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s-orbital

d-orbital

p-orbital

sp orbital

Which value is designated as absolute zero or zero of the Kelvin scale?

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-273.15°C

-173.15°C

273°C

none of these

When liquid solute is dissolved in liquid solvent, then the best unit of concentration is?

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% W/W

% W/V

% V/V

%V/W

Vapour pressure is not affected by

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Surface area

Intermolecular forces

Temperature

Nature of liquid

Intermolecular forces are _________ than binding forces

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stronger

Equal

Weaker

None

Which of the following is not the property of liquid crystal

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anisotropic

isotropic

three dimensional arrangement

fluidity

Amorphous solids

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have sharp melting points

undergo clean cleavage when cut with knife

have perfect arrangement of atoms

can possesses small regions of orderly arrangements of atoms

Absolute temperature of a gas is proportional to:

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Rotational Kinetic energy

Translational Kinetic energy

Vibrational Kinetic energy

Potential energy

Choose from the followings the correct statement about Born Haber cycle

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Born Haber cycle is different from Hess's law

The energy changes in a cyclic process is not zero

The lattice energy of crystalline substances can be calculated easily

None

Phenol can be diatingushed from ethyl alcohol by all of the following reagents except

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lodoforrn test

Na

Br2 /H2O

NaOH

By increasing pressure two times and decreasing temp. two times the volume of gas

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Volume increases 4 times

Volume decreases 4 times

Volume increases 2 times

Volume decreases 2 times

d-d transition cannot be shows by

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Cu+1

Sc+3

Zn+2

All

Substituted phenyl group are called

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Arene groups

Alkyl groups

Aryl groups

Acyl groups

Inside every fluorescent lamp there is present a:

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Gas

Plasma

Liquid

Solid

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

Fe+2 is the co-factor for

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Chrome oxidase

Glucose-6-phosphatase

Carbonic anhydrase

Hydrolase

Dehydrohalogenation of secondary butyI bromide will give

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Propene

1-Butene

Butene

2-Butene

H-bonding is maximum in:

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ethanol

benzene

diethyl ether

water

Electrolytic products of dilute aqueous solution of sodium sulphate is

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Na. SO2

H2. S02

Na. O2

H2,O2

Acording to the kinetic theory of gases

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The pressure exerted by a gas is proportional to mean square velocity of the molecules

The pressure exerted by the gas is proportional to the root mean square velocity of the molecules

The root mean square velocity is inversely proportional to the temperature

The mean translational KE of the molecule is directly proportional to the absolute temperature