- 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.
If the standard enthalpy of neutralization reaction of \(\text{HCl }\) and \(\mathrm{NaOH}\) is \(-57.3 \mathrm{~K}{\mathrm{J}}~ \mathrm{mol}^{-1}\), then find out the enthalpy of neutralization of \(0.25 \mathrm{~mol}\) of \(\text{HCl }\)by \(0.25 \mathrm{~mol}\) of \(\mathrm{NaOH}\) :
1. \(-57.3~ \mathrm{kJ} ~\mathrm{mol}^{-1}\)
2. \(-28.3 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
3. \(-14.32 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
4. \(+57.3~ \mathrm{kJ}~ \mathrm{mol}^{-1}\)
1. \(-57.3~ \mathrm{kJ} ~\mathrm{mol}^{-1}\)
2. \(-28.3 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
3. \(-14.32 \mathrm{~kJ} \mathrm{~mol}^{-1}\)
4. \(+57.3~ \mathrm{kJ}~ \mathrm{mol}^{-1}\)
Subtopic: Thermochemistry |
61%
Level 2: 60%+
NEET - 2024
Hints
Consider the following reaction:
\(\mathrm{2H_2(g) + O_2(g) \rightarrow 2H_2O(g); ~\Delta_rH^\circ = -483.64~ kJ }\)
What is the enthalpy change (in KJ) for the decomposition of one mole of water?
\(\mathrm{2H_2(g) + O_2(g) \rightarrow 2H_2O(g); ~\Delta_rH^\circ = -483.64~ kJ }\)
What is the enthalpy change (in KJ) for the decomposition of one mole of water?
| 1. | 120.9 | 2. | 241.82 |
| 3. | 18 | 4. | 100 |
Subtopic: Thermochemistry |
89%
Level 1: 80%+
NEET - 2023
Hints
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
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