- 1(current)
Q. No.The standard heat of formation, in kcal/mol of \(Ba^{2+}\) is :
[Given : standard heat of formation of \(SO^{2-}_4\) ion (aq) \(= -216~ \text{kcal/mol}\), standard heat of crystallisation of \(BaSO_4 (s)= -4.5~\text{ kcal/mol,}\) standard heat of formation of \(BaSO_4 (s)= -349 ~\text{kcal/mol]}\)
[Given : standard heat of formation of \(SO^{2-}_4\) ion (aq) \(= -216~ \text{kcal/mol}\), standard heat of crystallisation of \(BaSO_4 (s)= -4.5~\text{ kcal/mol,}\) standard heat of formation of \(BaSO_4 (s)= -349 ~\text{kcal/mol]}\)
| 1. | \(+133.0 \) | 2. | \(+220.5\) |
| 3. | \(-128.5 \) | 4. | \(-133.0\) |
Subtopic: Thermochemistry |
Level 3: 35%-60%
NEET - 2025
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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
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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
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- 1(current)
Q. No.
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