Question # 1

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

What is not correct about ∆HF

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It is always negative

Ìts value gives an idea about the relative stability of reactants and the products.

Its value can be greater or less than zero

Value depends upon nature of bonds

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

∆H=∆E is true for which of the following reaction

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K+H2O----->KOH+H2

N2+3H2------>2NH3

AlCl3+3NaOH--->Al(OH)3+3 NaCl

4Na + O2----->2Na2O

Neutralization of acid-base is

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Spontaneous

Exothermic

Non spontaneous

Both "a" and "c

Enthalpy of formation of one mole of ionic compound form gaseous ion under standard condition is called

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Gibb's energy

Bond energy

Lattice energy

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

The net heat change in a chemical reaction is the same whether it is brought about in two or more different ways in one or several steps.it is known as

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Henry's law

Hess's law

joule's law

Law of conservation of energy

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

One kilo calorie is equal to

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4.184J

1000J

4184J

1kJ

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

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

How much heat is absorbed by 100 g of water when its temperature decreases from 25°C to 5°C? (heat capacity is 4.2 J/gK)

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84,000J

2000/4.2J

-2000/4.2j

-8400J

In order to determine ∆H (latt) of ionic compound which is correct relationship

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∆H latt. = ∆Hf - ∆Hx

∆H latt. = ∆Ha + ∆Hv

∆H latt. = ∆Hf + ∆Hx

∆H latt. = ∆Hf - ∆H sol.

What is correct about heat of combustion

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It is applicable to gaseous substances only

It is always negative

It is always positive

It is positive in some cases while negative in other

The enthalpy change for the reaction C2H2 + 5/2 O2 --------> 2CO2 + H2O is known as enthalpy of

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Fomation of CO2

Fusion ofC2H4

Combustion of C2H4

Vaporization of C2H2

If internal energy of the system is increased

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Change in state of the system may occur

Temperature of the system may rise

Chemical reaction may take place

All of these

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

Hess's law is analogous to

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Law of heat summation

law of increasing entropy

Law of heat exchange

Ist law of thermodynamics

The values of ∆H for the process l(g)+e-1--------->
I-1(g) is:

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>0

<0

0

None

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