Question # 1

The no. of electrons in the valence shell of alkali metals is

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1

2

4

7

Intermolecular forces are of three types and are collectively called ____________

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Nelson' forces

Vander Waal's forces

Neurons

Nil

_________ can be separated by physical means.

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Mixture

Compound

Solution

Nil

Bronze (alloy) is a ____________

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Slolution

Mixture

a & b

Nil

The number of electrons in K shell of O is ________________

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9

10

2

1

Electrolyte is ____________ solid form.

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in

Sometimes in

Never in

Always in

the homogeneous mixture of two or more substances is ____________.

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Solution

Stronger

Suspension

None

The solution in which one component is aqueous ____________ solution.

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Aqueous

Binary

All

None

A _________ is a pure substance is made up of two or more elements.

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Mixture

Elements

Solution

Compound

The vapour pressure of a liquid increase with the:

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increase pressure

increase of temperature

increase of intermolecular forces

increase of polarity of molecules

The symbol of lead us

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As

Pb

Sb

Na

Molecular formula of butyne is .

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C₄H₆

C₃H₄

C₄H₇

C₄H₈

The smell of photocopies machine is due to the presence of.

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Chlorine gas

Neon gas

Helium gas

Ozone gas.

Water molecule has a structure:

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Ionic

Non polar

Tetrahedral

Polar

Water has a maximum density at 4 ^oC

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12 cm^-3

2 g cm^-3

1 g cm^-3

4 gcm^-3

The removal of Mg⁺² and Ca⁺² Ion which are responsible for the hardness of water is called.

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Temporary hardness

Permanent hardness

Water softening

Hydrogen bonding

Which diseases cause by the deficiency of vitamin E?

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Rickets

Anemia in babies

Scurvy

Night blindness

By the increase in the concentration of CO₂ in air.

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Decrease in heat energy

Increase in heat energy.

Heat energy remains same

None of them

Who proved that the presence of hydrogen as the main constituent of all acids.

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Lavoisier

Humphrey Davy

Dalton

Arrhenius

Swimming pools are cleaned by a process:

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Hydrogenation

Bromination

Chlorination

Nitration

In an irreversible reaction dynamic equilibrium:

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Never establishes

Established before the completion of reaction

Establishes after the completion of reaction

Establishes readily

Chemical formula of chloroform.

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CH₃Cl

CH₂O₂

CHCl₂

CCl₄

In order to mention the B.P. of water at 110°C, the external pressure should be

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Between 760 torr and 1200 torr

Between 200 torr and 760 torr

760 torr

Any value of pressure

An excess of aqueous silver nitrate is added to aqueous barium chloride and precipitate is removed by filtration. What are the main ions in the filtrate

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Conductivity of metal decreases by increasing temperature because.

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Atoms are converted to ions

Atoms oscillates and hinder the movement of free electrons.

Ions are converted into atoms

Velocity of mobile electrons increases

The S.I. units for the molar heat capacity are

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Joule Cm^-3degree^-1

Joule deg^-1atm^-1

Joule deg^-1mol^-1

Joule deg^-1kg^-1

The molecules of a gas show more deviation from ideal behaviour at low temperature, because

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Attractive force dominate at low temperature

Kinetic energies are increased

Collisions become less frequent

Densities of the gases increase

Standard enthalpy of combustion of carbon is -394 kJ mol-1 than, which is the standard enthalpy of formation of CO2

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+394 kJ

-394 kJ

0 kJ

+197 kJ

Dipole Moment of H2O is.

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1.61 D

1.85 D

0.95 D

1.49 D

VSEPR theory was proposed by

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Nyholn and Gillespie

Kossel

Lewis

Sidwick

Down the VII -A group, polarizability generally.

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Increases

Decreases

Remain constant

Negligible

In a solution 7.8 g of benzene and 46 g of toluene is present The mole fraction of benzene is.

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1/2

1/3

1/5

1/6

The volume occupied by 1.4 g on N₂at S.T.P is

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2.24 dm³

22.4 dm³

1.12 dm³

112 cm³

Which of the following elements is not present abundantly in earth's crust.

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Silicon

Aluminium

Sodium

Oxygen

What is effect of solubility of carboxylic acid in water by increasing their molecular masses.

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Decreases

Increase

Remain constant

Non effected

In primary alkyl halides, the halogen atom is attached to a carbon which is further attached to how many carbon atoms.

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One

Two

Three

Four

Which one of the following compound has octane number 100.

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2,2,4-trimethyl petane

n- pentane

2,4-dimethyl pentane

2- methyl pentane

Which one of the following is inorganic polymer

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Graphite

Rubber

DNA

Protein

The oxides of beryllium are

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Basicity

Rancidity

Amphoteric

none of all

The chief of aluminum is

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Na₃AlF₆

Al₂O₃.2H₂O

Al₂O₃

Al₂O₃.H₂O

Catalyst used to reduce carboxylic acid to alcohol is

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H₂/ Ni

H₂/ pt

NaBH₄

LiAIH₄

Which one of the following species is a nucleophile

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CH3

(CH3)2 C

BF3

OH-

The region of earth capable of supposing life is called.

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Atmosphere

Bisphere

Dithosphere

Hydrosphere

Ionization energy of calcium is.

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Lower than that of barium

Lower than that of magnesium

Higher than that of beryllium

Lower than that of strontium