Question # 1

A state function which describes together the internal energy and product of pressure and volume is called

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Enthalpy

internal energy

Work

Kinetic energy

The enthalpy change AH of a process is given by the relation

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ΔΗ =ΔΕ + P∆V

ΔH=ΔE +W

ΔH =ΔΕ-ΔnRT

ΔΕ =ΔΗ + P∆V

The enthalpies of all elements in their standard states are

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Unity

always +ve

always -ve

zero

The value of ∆V being very small. The term P∆V can be neglected for process involving

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Liquid and gas

Solids and gases

Liquid and solid

None of these

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

By convention, the standard heat of formation of all elements is assumed to be

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Zero

positive

Negative

Infinity

Enthalpy of neutralization (∆H°n) per mole of H2SO4/ Ba(OH)2 is

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+57.4 kJmol-1

-114.8 kJmol-1

-57.4 kJmol-1

One kilo calorie is equal to

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4.184J

1000J

4184J

1kJ

Which of the following has positive value of enthalpy

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Neutralisation

Atomization

combustion

All of the above

The measurement of enthalpy change at standard conditions means that we should manage the measurement at

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24°C at 1 atm

25°C at 1 atm

0C° at 1 atm

100C° 1 atm

The change in enthalpy when one mole of a substance is dissolved in a specified quantity of solvent at a given temperature is called

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Heat of reaction

Heat of solvation

Heat of combustion

Heat of solvent

If a reaction involves only solids and liquids, which of the following is true?

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ΔH = ΔE

ΔΗ =ΔΕ

ΔH>ΔΕ

AH =AE +nRT

Born-Haber cycle is an application of

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Hess's law

1" law of thermodynamics

Avogadro's law

1law of thermochemistry

Enthalpy of a reaction can be measured by

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Glass calorimeter

Barometer

Manometer

Thermometer

Enthalpy of a system can be calculated by which of following relationship

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q=ΔΕ

q=m×S×∆T

q=pv

q=m×v×∆T

ΔH° represent the enthalpy change at

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0°C and 1 atm pressure

25°Cand 1atm

0K and I atm pressure

25°C and 2 atm pressure

The exothermic process is

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Evaporation

Sublimation

Respiration

Boiling

NaOH+HCI- NaCI+ H2O. Enthalpy change in the above reaction is called

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Enthalpy of reaction

Enthalpy of Neutralisation

Enthalpy of formation

Enthalpy of combustion

The change in enthalpy of a system when one mole of the substance is completely burnt in excess of air or oxygen is called

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Heat of reaction

Heat of formation

Heat of atomization

Heat of combustion

Calorie is equivalent to

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0.4184J

4.184J

418.4J

40.18J

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