Thermochemistry Chapter 7 Chemistry 11th Class MCQ Test Preparation Punjab

Total Questions: 20

Total Marks: 20

Time: 20 Mins

Question # 1

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

Question # 2

Lattice energy can be calculated by means of _____.

Question # 3

BornHaber cycle is an application of _____.

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

Question # 4

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 # 5

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

FALSE
TRUE

Question # 6

The enthalpies of atomization are always _____.

positive
zero
negative
unity

Question # 7

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 # 8

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

Question # 9

When two chemicals mix their temperature rises:

endothermic
exothermic

Question # 10

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

endothermic
exothermic

Question # 11

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

Question # 12

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

Endothermic as well as exothermic reactions
Endothermic reaction
Exothermic reaction
Synthesis

Question # 13

Work done on a system is taken to be _____.

unity
negative
positive
zero

Question # 15

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