FSC Chemistry MCQs Chapter 7 Class 11

Created on February 10, 2022

Chemistry Ch 7 Class 11 Thermochemistry

1 / 56

Work done on the system is

PMC Sample 1
Chemistry
Thermochemistry
Elimination Tool:

A) Negative

B) depends upon Boundary Conditions

C) Positive

D) Zero

2 / 56

Transfer of heat from hot surroundings to a cold refrigerator is an example of:

NUMS 2014
Chemistry
Thermochemistry
Elimination Tool:

A) Spontaneous reaction

B) Non-Spontaneous reaction

C) First law of thermodynamics

D) All of the above options are correct

3 / 56

Thermochemistry is very important to learn about

PMC Sample 1
Chemistry
Thermochemistry
Elimination Tool:

A) Chemical Equilibrium

B) Chemical Bonding

C) Heat contents of a compound

D) All of these

4 / 56

Which enthalpy change is relevant in the following process

Na(s) -> Na (g) ΔH = +107

UHS 2019
Chemistry
Thermochemistry
Elimination Tool:

A) Enthalpy of atomization

B) Enthalpy of fusion

C) Enthalpy of vaporization

D) Enthalpy of formation

5 / 56

Energy for the endothermic reaction is given a ____ value?

PMC Practice 1
Chemistry
Thermochemistry
Elimination Tool:

A) Positive

B) Negative

C) Zero

D) Neither positive nor negative

6 / 56

Which one of the following equations correctly defines the enthalpy changes of formation of carbon monoxide:

NUMS 2018
Chemistry
Thermochemistry
Elimination Tool:

A) C(s) + 1/2 O2 -> CO(g)

B) C(g) + 1/2 O2-> CO(g)

C) C(s) + O(g)-> CO(g)

D) C(g) + CO2(g) -> 2CO(g)

7 / 56

For a chemical reaction A -> B, the threshold energy of the reaction is 37 kJ/mole. The average internal energy of A is 12 kJ/Mole. What will be the activation energy of A?

NTS 2016 SMBBMC
Chemistry
Thermochemistry
Elimination Tool:

A) 43 K.J/Mole

B) 37 K.J/Mole

C) 25 KJ/Mole

D) 19 K.J/Mole

8 / 56

Enthalpy of a compound is equal to its

NUMS 2016
Chemistry
Thermochemistry
Elimination Tool:

A) Heat of combustion

B) Heat of formation

C) Heat of solution

D) Heat of dilution

9 / 56

ΔH = ΔE + PΔV is the change in enthalpy at constant ________.

NUMS 2018
Chemistry
Thermochemistry
Elimination Tool:

A) Volume

B) Pressure

C) Temperature

D) Mass

10 / 56

Formation of carbon dioxide hinders in calculating the heat of formation of:

PMC Practice 1
Chemistry
Thermochemistry
Elimination Tool:

A) CCl4

B) O3

C) CO

D) C

11 / 56

What is the measure of activation energy in an endothermic reaction?

UHS 2019
Chemistry
Thermochemistry
Elimination Tool:

A) The energy of activation of backward reaction is less than that of forward reaction

B) The energy of activation of backward reaction is more that that of forward reaction.

C) The energy of activation of forward reaction is less than that of backward reaction.

D) The energy of activation of forward – backward reaction is same.

12 / 56

In chemistry the work is generally ___.

PMC Sample 1
Chemistry
Thermochemistry
Elimination Tool:

A) Done by Temperature change

B) Pressure – Temperature Work

C) Pressure Volume Work

D) None of these

13 / 56

Which of the following has the maximum specific heat?

Copper

Aluminium

Iron

Ice

14 / 56

Which ion will have a maximum value of the heat of hydration?

PMC Practice 1
Chemistry
Thermochemistry
Elimination Tool:

A) Al+3

B) Cs+

C) Ba+

D) Mg+2

15 / 56

A catalyst increases the rate of reaction by:

NTS 2019
Chemistry
Thermochemistry
Elimination Tool:

A) decreasing the activation energy

B) decreasing the concentration of reactants

C) decreasing the temperature

D) increasing the temperature

16 / 56

Which one is not related to evaporation?

NUMS 2015
Chemistry
Thermochemistry
States of Matter
States of Matter – Gases, Liquids and Solids
Elimination Tool:

A) Continuous

B) Endothermic

C) Exothermic

D) Spontaneous

17 / 56

Lattice Energy of ionic compounds are found by

PMC Sample 3
Chemistry
Chemical Bonding
Thermochemistry
Elimination Tool:

A) Hess' law

B) Born Habers Cycle

C) Law of Mass action

D) Law of conservation of mass

18 / 56

Which of following is NOT state variable of thermodynamics?

Entropy

Internal energy

Volume

Density

19 / 56

Through what phenomenons does heat flow?

PMC Sample 2
Chemistry
Thermochemistry
Elimination Tool:

A) Conduction

B) Convection

C) Radiation

D) All of these

20 / 56

The thermal energy at constant pressure is called:

PMC 2020
Chemistry
Thermochemistry
Elimination Tool:

A) Enthalpy

B) Internal Energy

C) Heat capacity

D) Work done

21 / 56

If pressure and volume of a gas are variable while temperature remains constant, this belongs to

PMC Sample 2
Chemistry
Thermochemistry
Elimination Tool:

A) Charles's law

B) Boyle's law

C) Avogadro's law

D) Pascal's law

22 / 56

Burning of fuel is a

Endothermic

Exothermic

Both a & b

None of these

23 / 56

Heat of vaporization of water is kcal/kg

574

674

474

364

24 / 56

Born Haber cycle is used to determine:

PMC 2020
Chemistry
Thermochemistry
Elimination Tool:

A) Electron affinity

B) Lattice energy

C) Crystal energy

D) All of the above

25 / 56

One Calorie is equivalent to:

NTS 2019
Chemistry
Thermochemistry
Elimination Tool:

A) 0.4184J

B) 41.84 J

C) 4.184 J

D) 418.4 J

26 / 56

When two moles of H2 and one mole of O2 react to form H2O, 484 KJ heat is evolved. What is Δ Hf for one mole of H2O?

NUMS 2019 Reconduct
Chemistry
Thermochemistry
Elimination Tool:

A) -484 KJmol-1

B) -242 KJmol-1

C) -121 KJmol-1

D) +242 KJmol-1

27 / 56

Which of the following values of heat of formation indicates that the product is least stable?

NTS 2017
Chemistry
Thermochemistry
Elimination Tool:

A) -393.5 KJ

B) -972.7 KJ

C) +89.9 KJ

D) +272.2 KJ

28 / 56

Molar heat of vaporization is the amount of heat required to convert one mole of:

NUMS 2020
Chemistry
Thermochemistry
Elimination Tool:

A) A liquid into its vapours at its boiling point

B) Liquids into its vapours

C) Solids into vapours

D) Solid into liquid at its melting point

29 / 56

Heat of Neutralization is defined as:

Heat of formation of one mole of salt

Both a and b

Heat of formation of one mole of water

None of these

30 / 56

In those reactions where determination of enthalpy value is difficult by experiments, in such cases enthalpy value can be calculated by:

NTS 2014
Chemistry
Thermochemistry
Elimination Tool:

A) Hess's law

B) Henry's law

C) Kirchoff's law

D) Clapeyron equation ‘

31 / 56

During a chemical reaction, heat of Formation Is:

Evolved

Absorbed

Either Evolved or Absorbed

None of the above

32 / 56

The enthalpy change of the reaction

H2(g) + ½ O2 -> H2O (l)

under standard conditions is:

NUMS 2017
Chemistry
Thermochemistry
Elimination Tool:

A) Enthalpy change of formation of water

B) Enthalpy change of neutralization

C) Both; Enthalpy change of combustion of Hydrogen and enthalpy change of formation of water

D) Enthalpy change of combustion of Hydrogen

33 / 56

If a graph is plotted between pressure on x- axis and volume on y- axis for Boyle’s law verification, the curve obtained is called

PMC Sample 2
Chemistry
Thermochemistry
Elimination Tool:

A) pseudotherm

B) isotherm

C) biotherm

D) all of these

34 / 56

If a system absorbs heat, the surrounding temperature

Increases

Remains same

Decreases

Decreases then suddenly Increases

35 / 56

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. This is known as:

NTS 2019
Chemistry
Thermochemistry
Elimination Tool:

A) Henry's law

B) Hess's law.

C) Joule's principle

D) Dalton's law

36 / 56

The reaction 2CO + O2 -> 2CO2 proceeds slower because activation energy is:

NTS 2018
Chemistry
Thermochemistry
Elimination Tool:

A) Equilibrium

B) Constant

C) Low

D) High

37 / 56

The measurement of heat absorbed or given out in a chemical reaction is referred to as:

NTS 2011
Chemistry
Thermochemistry
Elimination Tool:

A) Enthalpy

B) Endothermic reaction

C) Exothermic reaction

D) Thermochemistry

38 / 56

In an adiabatic process:

NUMS 2016
Chemistry
Thermochemistry
Elimination Tool:

A) Pressure is maintained constant

B) The gas is isothermally expanded

C) There is perfect heat insulation

D) System exchanges heat with the surroundings

39 / 56

Starting point of Kelvin scale is:

NUMS 2020
Chemistry
Thermochemistry
Elimination Tool:

A) 0 K

B) -400 K

C) -210 K

D) -273.15 K

40 / 56

The enthalpy change accompanying the gain of an electron by a neutral gaseous atom to form a negative ion is called:

NTS 2010
Chemistry
Thermochemistry
Elimination Tool:

A) Ionization potential

B) Electronegativity

C) Electron affinity

D) Lattice energy

41 / 56

One Calorie is equal to:

PMC 2020
Chemistry
Thermochemistry
Elimination Tool:

A) 4.18 KJ

B) 4.18 J

C) 0.418 KJ mol-1

D) 0.418 KJ

42 / 56

Anything under test or observation in laboratory is called

PMC Sample 2
Chemistry
Thermochemistry
Elimination Tool:

A) Surrounding

B) System

C) Confined space

D) None of these

43 / 56

Given the bond energy N ≡ N, N – H and H – H bonds are 945, 391, and 436 kJmol-1 respectively, the enthalpy of the reaction N2 (g) + 3H2(g) -> 2NH3 (g) is;

NUMS 2017
Chemistry
Thermochemistry
Elimination Tool:

A) -93 kJ

B) 102 kJ

C) 90 kJ

D) 105 kJ.

44 / 56

Which of the following are the fundamental ways of transferring energy?

NUMS 2014
Chemistry
Thermochemistry
Elimination Tool:

A) Pressure and work

B) Volume and pressure

C) Heat and work

D) Pressure and heat

45 / 56

Which of the following statements is NOT true for the first law of thermodynamics?

NTS 2014
Chemistry
Thermochemistry
Elimination Tool:

A) Total energy of the system and surrounding is conserved

B) Energy can neither be created nor destroyed

C) It is the same as law of conservation of energy

D) Total energy of the system is increasing

46 / 56

Exothermic Reactions heat is

PMC Sample 2
Chemistry
Thermochemistry
Elimination Tool:

A) Taken in

B) Give out to surroundings

C) Neither given nor lost

D) None of these

47 / 56

For a reaction given below

C(s) + O2 (g) -> CO2 (g) + 394 kJ / mol

The enthalpy of reaction is

NTS 2016 SMBBMC
Chemistry
Thermochemistry
Elimination Tool:

A) 394 kJ / mol

B) -394 kJ / mol

C) 197 kJ / mol

D) -197 kJ / mol

48 / 56

Which of the following condition is constant in Bomb calorimeter?

PMC Practice 1
Chemistry
Thermochemistry
Elimination Tool:

A) Pressure

B) Volume

C) Temperature

D) All of these

49 / 56

For a chemical reaction A + B, the threshold energy of the reaction is 31 KJ/mole. The average internal energy of A is 12 KJ/mole. What will be the activation energy of A?

NUMS 2018
Chemistry
Thermochemistry
Elimination Tool:

A) 43 KJ/mole

B) 37 KJ/mole

C) 25 KJ/mole

D) 19 KJ/mole

50 / 56

Heat evolved or absorbed in a chemical reaction does not depend upon?

NTS 2016 SMBBMC
Chemistry
Thermochemistry
Elimination Tool:

A) Amount of reactants

B) Pressure of reaction

C) Physical state of reactants and products

D) Temperature

51 / 56

The enthalpy of certain reactions at 273 K is -20.75 kJ. The enthalpy of the same reaction at 373 K (if heat capacities of reactants and products are the same) will be:

NTS 2017
Chemistry
Thermochemistry
Elimination Tool:

A) －20.75 kJ

B) -2075 kJ

C) Zero

D) －20.75 x 373/273 kJ

52 / 56

Two rocket fuels below are determined by their high performance.

N2H4(l) + O2(g) -> N2(g) + 2H2O(l) ΔH= -632 kJ

H2 (g) + ½ O2(g) -> H2O(l) ΔH = -286 kJ

If equal masses of hydrazine and hydrogen are used, which of the following has better performance?

NUMS 2019 Cancelled
Chemistry
Thermochemistry
Elimination Tool:

A) Hydrazine

B) Both have equal enthalpy of formation

C) Hydrogen gas

D) Cannot be compared

53 / 56

Some substances lack definite heats of fusion. These substances are:

NUMS 2020
Chemistry
Thermochemistry
Elimination Tool:

A) Isomorphs

B) Polymorphs

C) Amorphous solids

D) Crystalline solids

54 / 56

The heat of a reaction can be calculated by using:

NTS 2010
Chemistry
Thermochemistry
Elimination Tool:

A) Joule's Law

B) Ohm's Law

C) Hess's Law

D) Faraday's Law

55 / 56

Cl + e —-> Cl-

ΔH = -348kJ/mol

The value -348KJ/mol in this case will be:

NTS 2012
Chemistry
Thermochemistry
Elimination Tool:

A) Ionization energy

B) Electronegativity

C) Electron affinity

D) Entropy

56 / 56

Value of heat capacity of water is

4.51 J/g

4.18 J/g

4.921J/g

4.21J/g

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