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Class XI Chemistry Thermodynamics 5: Important Questions

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Question 1

The gas absorbs 100 J heat and is simultaneously compressed by a constant external pressure of 1.50 atm from 8 litres to 2 litres. Hence ΔE will be

Question 2

A pressure cooker reduces cooking time for food because

Question 3

A system is changed from state A to state B by one path and from B to A by another path. If ΔE₁ and ΔE₂ are the corresponding changes in internal energy, then -

Question 4

First four ionization energies of Ni and Pt are given below:
(IE₁ + IE₂) (IE₃ + IE₄)
Ni 2.49 × 10³ kJ mol^–1 8.8 × 10³ kJ mol^–1
Pt 2.66 × 10³ kJ mol^–1 6.7 × 10³ kJ mol^–1
From the data it can be concluded that

Question 5

The heat of combustion of sucrose, C₁₂H₂₂O₁₁(s) at constant volume is –1348.9 kcal mol^–1 at 25C, then the heat of reaction at constant pressure, when steam is produced, is

Question 6

Given the bond energies N ≡ N, H – H and N – H bonds are 945, 436 and 391 kJ mole^–1 respectively, the enthalpy change of the reaction -
N₂(g) + 3H₂(g) → 2NH₃(g) is -

Question 7

The standard enthalpy changes for the combustion of carbon and carbon monoxide are shown below.

C(s) + O₂(g)→ CO₂(g) ΔH = -394 kJ mol^-1CO(g) + 1/2 O₂(g)→ CO₂ (g) ΔH = -283 kJ mol^-1
What is the standard enthalpy change, in kJ, for the following reaction?

C(s) + 1/2O₂(g)→ CO (g)

Question 8

In the following table, which are correct–
ΔH ΔS Nature of reaction

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