- 1(current)
Q. No.Find the standard heat of formation of Ba²⁺(aq) using the following data:
Given:
ΔH°f(SO₄²⁻, aq) = −216 kcal mol⁻¹
Heat of crystallisation of BaSO₄(s) = −4.5 kcal mol⁻¹
ΔH°f(BaSO₄, s) = −349 kcal mol⁻¹
| 1. | +133.0 | 2. | +220.5 |
| 3. | -128.5 | 4. | -133.0 |
Subtopic: Thermochemistry |
Level 3: 35%-60%
NEET - 2025
Please attempt this question first.
Hints
Please attempt this question first.
At standard conditions, if the change in the enthalpy for the following reaction is –109 kJ mol–1
H2(g)+Br2(g)2HBr(g) and the bond energy of H2 and Br2 is 435 kJ mol–1 and 192 kJ mol–1 respectively, what is the bond energy (in kJ mol–1) of HBr?
| 1. | 368 | 2. | 736 |
| 3. | 518 | 4. | 259 |
Subtopic: Thermochemistry |
57%
Level 3: 35%-60%
NEET - 2020
Hints
Links
Calculate the heat released when 5 L of a gaseous mixture of methane (CH₄) and propane (C₃H₈) is completely combusted at 0°C and 1 atm, given that 16 L of oxygen is consumed.
Enthalpy of combustion: ΔHc(CH₄) = 890 kJ mol⁻¹, ΔHc(C₃H₈) = 2220 kJ mol⁻¹.
Enthalpy of combustion: ΔHc(CH₄) = 890 kJ mol⁻¹, ΔHc(C₃H₈) = 2220 kJ mol⁻¹.
| 1. | 38 | 2. | 317 |
| 3. | 477 | 4. | 32 |
Subtopic: Thermochemistry |
64%
Level 2: 60%+
NEET - 2013
Hints
The enthalpy of fusion of water is 1.435 kcal/mol. The molar entropy change for the melting of ice at 0 oC is:
| 1. | 10.52 cal/(mol K) | 2. | 21.04 cal/(mol K) |
| 3. | 5.260 cal/(mol K) | 4. | 0.526 cal/(mol K) |
Subtopic: Thermochemistry |
81%
Level 1: 80%+
AIPMT - 2012
Hints
- 1(current)
Q. No.
© 2026 GoodEd Technologies Pvt. Ltd.