4

+198.0 KJ

-198 KJ

-118.67 KJ

187.8 KJ

B. -198 KJ

4

5

9

99

0

4

high

low

average

very high

4

# The total heat content of a system is known as....

Enthalpy

Thermal Energy

Entropy

Activation Energy

4

# Heat of Reaction between sodium hydroxide and hydrochloric acid is 57.32 . So heat of dissociation of water is

-57.32 KJ $mol{e}^{-1}$

+23.7KJ $mol{e}^{-1}$

+57.32 KJ $mol{e}^{-1}$

-13.7KJ $mol{e}^{-1}$

4

# The solution energy of $A{I}^{+++}$ion is more than that of $M{g}^{+++}$ due to...

high ionisation energy of $A{I}^{+++}$ ion

greater size of $A{I}^{+++}$ ion

greater charge on $A{I}^{+++}$ ion

small size of $A{I}^{+++}$ ion

4

# Heat of reaction

depends on the rate of reaction

depends on pressure

is independent of temperature

may or may not depend on temperature

4

# The enthalpy of the elements in their standard states is taken as zero. So the enthalpy of formation of a compound may be

negative

positive

zero

negative or positive

4

+198.0 KJ

-198 KJ

-118.67 KJ

187.8 KJ

4

Thermometer

Ammeter

Voltameter

Calorimeter

4

728

448

142

224

4

# On burning hydrogen in an atmosphere of chlorine, 1.65 gm of HC1 was obtained and 1 Kcal of heat was liberated. The heat of formation of HC1 should be ?

-21.12 Kcal $mo{l}^{-1}$

-44.2 Kcal $mo{l}^{-1}$

500 cal $mo{l}^{-1}$

500 cal $g{m}^{-1}$

4

# The molar entropy of vaporisation of a liquid at its boiling point is

25 $J{K}^{-1}mol{e}^{-1}$

100 $J{K}^{-1}mol{e}^{-1}$

80 $J{K}^{-1}mol{e}^{-1}$

90 $J{K}^{-1}mol{e}^{-1}$

4

Zero

25 cal.

17.2 J

52.4 cal

4

27.3

31.7

15.7

13.7

4

HP < HR

HP > HR

2HP = 3HR

HP = HR

4

is constant

decreases

increases

is zero

4

+265.0

-165.0

-109.5

+109.5

4

2.5

+1.5

+297.5

3.5

4

# In a thermal decomposition reaction, sign of $∆H$ may be...

positive

negative

No sign

positive or negative.

4

# The factor that does not influence the heat of reaction is...

method by which reactants change to products

chemical state of the reactants and products

whether it is taking place at constant temperature

All the above

4

# Heat of combustion of methane and ethane are -291.7 Kcal & — 441.2 Kcal respectively:

Methane is a better fuel because ethane is poisonous

Methane is a better fuel than ${C}_{2}{H}_{6}$

Ethane is a better fuel than $C{H}_{4}$

Both are equally efficient as a fuel

4

# The highest temperature at which vapour pressure of a liquid can be measured is..

the boiling point of the liquid

critical solution temperature

ionisation temperature

inversion temperature

4

Isobaric

Isothermal

none of above

4

-2.09

2.09

-2.1%

2.196

4

728

448

142

224

4

-11.3 Kcal

+11.3 Kcal

-17.3 Kcal

125.5 Kcal

4

2.39 Cal

0.04184 Cal

1.390 Cal

0.239 Cal