Question # 1

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

Allotropic forms of carbon are:

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five

three

four

two

If R, T, M, V and P are gas constant, temperature, molar mass, volume and pressure then density is given by:

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M/V

RT/M

PM/RT

V/M

The boiling point of Kr is higher (-152.23°C) than that of helium (-268.6°C) due to

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Kr forms greater number of covalent bonds

greater polarizability of Kr than He

Kr has lowest freezing point

Kr is in liquid state at ordinary temperature

Some substance are good conductors of electricity in both the solid and liquid states. These substance are generally:

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molecular solids

ionic substances

metallic substances

covalent network solids

Which one of the following does not show isomerism?

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Propane

Hexane

Butane

Pentane

Which alcohol is most reactive towards sodium metal?

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Ter Butyl alcohol

n-Propyl alcolol

Isopropyl alcohol

Have same reactivity

Molten lead and iead (II) bromide both conduct electricity. Which one of the following statements relating to this is true?

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Both undergo chemical change when they conduct

Both conduct by the movement of charge particles

Both will also conduct in the solid state

Both contain mobile electrons

2-propanol on Oxidation gives

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Aldehyde

Carboxylic Acid

Ketone

Alcohol

At constant pressure, if the original volume is 546 cm³at which temperature the volume of gas 552 cm³

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1°C

2°C

3°C

4°C

The standard reduction potential of Zinc is

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0.76V

0.34

-0.34V

-0.76V

Catalyst used for ammonia synthesis is

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Cu

Co

Zn

Fe

The B.P of glycerine at 760 torr pressure is

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200°C

290C°

250C°

262C°

In dilatometric method is directly proportional to extent of reaction

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Change in concentration

Change in pressure

Chang in volume

Change in temperature

The geometry of diamonds is

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tetragonal

cubic

rhombohedral

none of these

The rate of diffusion of a gas is:

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Inversely proportional to its density.

Inversely proportional to square root of its molecules mass.

Directly proportional to molecular mass.

Directly proportional to its density.

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

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ion-dipole forces

dipole-dipole forces

dipoles-induced dipole forces

instantaneous dipole-induced dipole

The diffusion of gasses at absolute zero will be:

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Slightly decrease

unchanged

Slightly increased

Zero

Vapour pressure of a substance does not depend upon:

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physical state of matter

temperature

intermolecular forces

surface area

Which one is an isomorphic pair?

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NaNO3, CaCO3,

NaF, MgO

K2SO4 ,K2Cr2O7

Zn, Cd

London forces are more affective at

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low temperature

high temperature

low pressure

low temperature and high pressure

The mono atomic gas molecules are ______ gas molecules

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Halogen

Zero

Noble

Both b and c

Which if the following will have the same number of molecules at S.T.P?

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280cm³ of CO₂ and 280cm³ of N₂O

11.2dm³ of O₂and 32g of O₂

44g of CO₂and 11.2dm³ of CO

28g of N₂and 5.6dm³ of oxygen

Gases exert pressure on walls of container because the gas molecules:

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Obey gas laws.

Have definite volume.

Collide with the walls of container.

Collide with each other.

Intermolecular forces exist between molecules of group 7 elements which of the following sequence represents the strength of the intermolecular forces?

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Cl₂> Br₂> I₂

Br₂> Cl₂> I₂

Cl₂> Br₂> I₂

I₂> Br₂> Cl₂

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

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 solubility product of AgCl is
2.0 x 10(-10) mol2 dm(-6). The maximum concentration Ag+ ions in the solution is:

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1.41 × 10(-5) mol. dm(-3)

1.41 × 10(-10) mol. dm(-3)

2.0 × 10(-10) mol. dm(-3)

4.0 × 10(-20) mol. dm(-3)

The reason that diamond and graphite have different physical properties is

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density

color

bonding

hardness

A crystal system in which the unit cell has different all cell lengths but all angles equal to 90° it is called as

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orthorhombic

triclinic

monoclinic

cubic

lonic bond is produced after complete transfer of

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nucleus

neutrons

electrons

protons

The material possessing superconducting properties is

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Yb Ba₂ Cu₂ O₈

Hg Be₂ Ca₂ Cu₂ O₈

Y Ba₂ Cu₃ O₇

Y B₂ Cu₃ O₇

According to Boyle's law at constant temperature, the product of pressure and volume of a given mass of gas is:

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a constant

fraction

whole number

a multiple

CO2 and SO2 are both triatomic molecules, but heat of vaporization of SO2 is greater than that of CO2. This is due to

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greater electronegative character of sulphur

greater size of SO2 molecule

SO2 is polar and CO2 is non-polar

SO2 is more acidic in nature than CO2

Which of the following solid is amorphous

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NaCl

diamond

glass

MgO

Which pair of molecules have debye force

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Ne and Ne

Argon and water

Na⁺ion and water

Water and water

Inside every fluorescent lamp there is present a:

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Gas

Plasma

Liquid

Solid

The nature of l₂crystals are

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Metallic

Covalent

Ionic

Molecular

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

Which of the following are responsible for the colour developed in transition elements compounds?

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s-orbitals

p-orbitals

d-orbitals

f-orbitals

The average kinetic energy of an ideal gas per molecule is SI units at 25°C will be

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6.17 x 10^-21 KJ

6.17 x 10^-21 J

6.17 x 10^-20 J

7.16 x 10^-20 J

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

According to Boyles law, at constant temperature the product of pressure and volume of a given mass of gas is

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whole number

a constant

fraction

a multiple

The state of matter which exist only within a relatively narrow range of temperature and pressure

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Solid

Gas

Liquid

Plasma

The total K.E. of one mole of an ideal gas is given by:

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1/2 RT

3/2 RT

1/2 KT

3/2 KT

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

At different temperature, the vapour pressure of water is

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different

same

low

high

The Complete oxidation of ethanol produces first Ethanal than

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Ethanal

Propanone

Ethanoic acid

Benzoic acid

Formalin contains-------% alcohol.

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37

80

8

52

On ascending the electrochemical series strength as reducing agent

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Increases

Decreases

Remains same

not determinable

One kilo calorie is equal to

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4.184J

1000J

4184J

1kJ

Hydrogen bonding is extensively present in proteins which form the spiral. The hydrogen bond being produced is between

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nitrogen and hydrogen atom

oxygen and hydrogen atom

carbon and hydrogen atom

oxygen and carbon atom

Which of the following has isomorphous structure with MgO

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NaF

S

Sn

N

Freshly cut metals have a shining surface because

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electrons excited, then excited electrons release energy as light

metals have brittle nature

metals conductivity increases

metals are malleable and ductile

If pressure is increased from a 2 atm to 4 atm on a gas then its volume will decrease from:

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3L to 1L

4L to 2L

6L to 4L

8L to 2L

Whenever a reaction is endothermic, then it means that

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Heat is transferred system to the surrounding

Heat is transferred from surrounding to the system

Heat content of the products is less than that of reactants

Heat content of the reactants is greater than the products

According to Avogadros law 1 mole of gas at S.T.P has a volume of

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22.4 dm³

24 dm³

24000 cm³

2m³

Which of the following liquid has high vapour pressure?

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H₂O

ether

CH₃OH

C₂H₅OH

Potassium crystallizes with a

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Orthogonal lattice

Cubic lattice

Triclinic

Ortho rhombic lattice

The oxidation of SO2 to SO3 is exothermic reaction. The yield of SO3 will be maximum if

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Temperature is increased and pressure is kept constant

Temperature is reduced and pressure is increased

Both temperature and pressure are increased