Question # 1

Ice float over water because.

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Its structure is diamond like

Its density is maximum at 4 ^oC

It is less dense than water

It has no regular arrangement of molecules.

Colligative properties are used to determine the

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Freezing points

Boiling point

Atomic mass of an element

Molar mass of solute

Which of the following solutions will have the highest boiling point

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0.1 M NaCI

0.1 M CaCI₂

0.1 M FeCI₃

0.1 M glucose

a zero order reaction is one is which

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Reactants do not react

One reactant is in large excess

Concentration of reactant do not change with passage of time

Rate is of affected by changing concentration of reactants

The Number of moles of CO2 which contain 8.0 of oxygen.

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0.25

0.15

0.35

1.45

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

18 g of glucose is dissolved in 90 g of water. The relative lowering of vapour pressure is equal to

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1/5

5.1

1/51

6

When a chemical reaction is completed the

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Instantaneous rate > average rate

Instantaneous rate = average rate

Instantaneous rate is zero

Both average and instantaneous rates become zero

Azeotropic mixture

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Obey Raoult's law

Do not obey Raoult's law

Boils at low temperature only

Boils at high temperature only

Fuel cells are the means by which chemical energy may be converted into

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Heat energy

Magnetic energy

Sound energy

Electric energy

If the salt bridge is not used between two half cells, then the voltage

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Decreases rapidly

Decreases slowly

Does not change

Drops to zero

Dipole moment of CO2 is.

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1.25 D

1.85 D

3.1 D

Zero

Dipole moment is defined as.

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Charge x distance

Charge x Debye

Charge x displacement

Charge x bond energy

The lightest value of lattice energy is for which one of these ionic compounds.

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NaI

NaF

NaBr

NaCl

Molarity of pure water is

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1

18

55.5

6

Vapour pressure of a substance does not depend upon.

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Temperature

Intermolecular forces

Surface area

Physical state of water

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 net change in a chemical reaction is same whether it takes place directly or indirectly is

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Henry's law

Charles's

Hess's lass

Graham's law

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