NEET Chemistry: Thermodynamics — MCQ Test 19

Q6. Calculate \(\Delta H\) for \(C(s) + CO_2(g) \rightarrow 2CO(g)\) using: \(C(s) + O_2(g) \rightarrow CO_2(g)\), \(\Delta H = -393.5 \, \text{kJ/mol}\); \(CO(g) + \frac{1}{2}O_2(g) \rightarrow CO_2(g)\), \(\Delta H = -283 \, \text{kJ/mol}\).

Q7. Calculate the bond enthalpy of \( C=O \) in \( CO(g) \) given: \( \Delta H_f^\circ (CO,g) = -110.5 \, \text{kJ/mol} \), \( \Delta H_a (C,g) = 715.0 \, \text{kJ/mol} \), \( \Delta H_a (O,g) = 249.0 \, \text{kJ/mol} \).

Q8. For a reaction with \(\Delta H = 90 \, \text{kJ/mol}\) and \(\Delta G = 30 \, \text{kJ/mol}\) at 300 K, what is \(\Delta S\)?

Q9. Using Hess’s law, calculate \(\Delta H\) for \(C(graphite) + 2H_2(g) \rightarrow CH_4(g)\), given: \(C(graphite) + O_2(g) \rightarrow CO_2(g)\), \(\Delta H = -393.5 \, \text{kJ/mol}\); \(H_2(g) + \frac{1}{2}O_2(g) \rightarrow H_2O(l)\), \(\Delta H = -285.8 \, \text{kJ/mol}\); \(CH_4(g) + 2O_2(g) \rightarrow CO_2(g) + 2H_2O(l)\), \(\Delta H = -890.3 \, \text{kJ/mol}\).

Q10. Calculate \(\Delta S_{sys}\) when 1 mol of an ideal gas is compressed isothermally from 25 L to 5 L at 350 K. (\(R = 8.314 \, \text{J/mol·K}\))

NEET ChemistryThermodynamics

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Which of the following is a state function?

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About this NEET MCQ Test

This page provides a free online MCQ test for NEET Chemistry preparation, focusing specifically on the chapter Thermodynamics. It contains 10 carefully selected multiple-choice questions (MCQs) designed to test your conceptual understanding and exam readiness.

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Key concepts covered in this specific test include Following, Function, Enthalpy, Combustion, Released, and Calculate.

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Preview of Questions in this Test

Q1. Which of the following is a state function?

  • A. Internal energy
  • B. Work done
  • C. Heat absorbed
  • D. Rate of reaction

Q2. The enthalpy of combustion of benzene is -3267.6 kJ/mol. What is the heat released when 39 g of benzene is burnt? (Molar mass = 78 g/mol)

  • A. 1633.8 kJ
  • B. 3267.6 kJ
  • C. 816.9 kJ
  • D. 6535.2 kJ

Q3. Calculate \( \Delta S_{sys} \) when 2 mol of an ideal gas expands isothermally from 1 atm to 0.25 atm at 300 K. (\( R = 8.314 \, \text{J/mol·K} \))

  • A. 11.5 J/K
  • B. 16.6 J/K
  • C. 23.0 J/K
  • D. 46.1 J/K

Q4. Calculate \(\Delta S_{sys}\) when 1 mol of an ideal gas expands isothermally from 4 L to 16 L at 500 K. (\(R = 8.314 \, \text{J/mol·K}\))

  • A. 5.76 J/K
  • B. 11.52 J/K
  • C. 23.04 J/K
  • D. 8.314 J/K

Q5. Which of the following is always true for an exothermic process at constant pressure?

  • A. \(\Delta H < 0\)
  • B. \(\Delta U < 0\)
  • C. \(\Delta S > 0\)
  • D. \(\Delta G < 0\)

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