Thermochemistry Chapter 7 Chemistry 11th Class MCQ Test Preparation Punjab

Total Questions: 20

Total Marks: 20

Time: 20 Mins

Question # 1

The enthalpies of atomization are always _____.

positive
zero
negative
unity

Question # 2

The reaction given in the figure causes the temperature of its surroundings to increase. This reaction is _____, and therefore heat is _____ by the reaction.

exothermic, released
endothermic, released
exothermic, absorbed
endothermic, absorbed

Question # 3

Work done by a system on the surrounding is taken to be _____.

negative
positive
unity
zero

Question # 4

Work done on a system is taken to be _____.

unity
negative
positive
zero

Question # 5

Two fundamental ways to transfer energy are _____.

heat and volume
heat and work
pressure and temperature
pressure and volume

Question # 6

In case of nonspontaneous reaction, the reaction favoured is _____.

forward
None of these
reverse
both forward and reverse

Question # 7

Lattice energy can be calculated by means of _____.

Question # 8

BornHaber cycle is an application of _____.

Hesss law
second law of thermodynamics
first law of thermodynamics
first law of thermochemistry

Question # 10

What type of chemical reaction absorbs energy from the surrounding to occur?

Endothermic as well as exothermic reactions
Endothermic reaction
Exothermic reaction
Synthesis

Question # 11

In view of Born-Haber cycle, energy change in cyclic process is always _____.

Question # 12

What type of reactions does not require initial energy to occur?

Endothermic as well as exothermic reactions
Endothermic reaction
Exothermic reaction
Decomposition

Question # 13

When two chemicals mix their temperature rises:

endothermic
exothermic

Question # 14

The change in internal energy of a system at constant volume is equal to heat absorbed.

FALSE
TRUE

Question # 15

A system has constant volume ( Δ V=0) and the heat around the system increases by 38 J. What is Δ U equal to?

Question # 16

The enthalpy change when one mole of a substance is completely burnt in excess of oxygen under STP:

Question # 17

All bonds in the compound are _____ in atomization.

formed
broken

Question # 18

Which statement correctly describes Hess's Law?

The enthalpy change of a reaction is independent of the route taken.
The enthalpy of all reactants in their standard states is defined as zero.
Exothermic reactions occur quickly, endothermic reactions occur slowly.
The enthalpy change of a reaction may only be calculated at 1 atm pressure and 25° C.
Enthalpy changes may only be calculated if one or more of the reactants is an element.

Question # 19

When one mole of a strong acid neutralises one mole of a strong base, the enthalpy change is _____.

Question # 20

If a reaction finishes with more energy than it started, it must be an _____ reaction.