Chemistry Chapter 7 Thermochemistry Mcqs Test Online Punjab 11th Class

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Question 1 of 12

Chemistry

1. A bomb calorimeter is used in __________ calorimetric

Constant pressure

Constant temperature

Both a and b

Constant volume

Question 1 of 12

Question 2 of 12

2. Calorie is equivalent to

4.18J

0.418J

0.418KJ

4.18KJ

Question 2 of 12

Question 3 of 12

3. Which of the following substances have zero value for their standard enthalpy of formation.

O₃

ZnO

H₂O

None of these

Question 3 of 12

Question 4 of 12

4. For writing a thermochemical equation for enthalpy of combustion of an element requires,
(a) 1 mole of element as reactant
(b) 1 mole of oxide of element as product
(c) Standard states of all the substances
(d) Balanced equation of 1 mole of element

a, b

a, b, c, d

a

a, c, d

Question 4 of 12

Question 5 of 12

5. q = ∆H when

∆E = 0

∆V = 0

None of these

P = 0

Question 5 of 12

Question 6 of 12

6. Total heat content of a system is called

Enthalpy

State Function

Internal energy

Heat

Question 6 of 12

Question 7 of 12

7. Which of the following is not a state function of a system.

Internal energy

Work done

Thermal energy at constant pressure

Enthalpy

Question 7 of 12

Question 8 of 12

8. A balloon filled with oxygen is placed in a freezer. Identify system:

All of these

Freezer

Balloon

Oxygen

Question 8 of 12

Question 9 of 12

9. Boron Haber cycle is used to determine lattice energies of

Ionic solids

Metallic solids

Molecular solids

Covalent solids

Question 9 of 12

Question 10 of 12

10. Heat of ________ of a substance is always negative

Solution

Decomposition

Combustion

Formation

Question 10 of 12

Question 11 of 12

11. Enthalpy of combustion for C is – 393.5 KJmole⁻¹ C(s) + O₂(g) → CO₂(g)  ∆H°_combustion = -393.5 KJmole⁻¹ Enthalpy of formation of CO₂ would be

Zero

Cannot be predicted form the given equation

-393.5 KJ

+393.5 KJ

Question 11 of 12

Question 12 of 12

12. Enthalpy of neutralization of all the strong acids and strong basis has the same value due to:

The complete ionization of acids and bases

The formation of salt

The formation of salt and water

The combination of H⁺ and OH ions to form water

Question 12 of 12

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