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Thermodynamics · Question 6

NEET (UG) 2025MCQMedium📈 Topic in 12% papers+4−1
1

The standard heat of formation, in kcal/mol of Ba2+ is : [Given : standard heat of formation of SO42- ion (aq) = -216 kcal/mol, standard heat of crystallisation of BaSO4(s) = -4.5 kcal/mol, standard heat of formation of BaSO4(s) = -349 kcal/mol]

  1. +133.0
  2. +220.5
  3. -128.5
  4. -133.0

Answer

(3) -128.5

Solution

Heat of crystallisation: Ba2+(aq) + SO42-(aq) BaSO4(s); H = -4.5 kcal/mol

∵ r H = f H(products) - f H(reactants)

⇒ -4.5 = -349 - [ f H( Ba2+) + (-216)]

⇒ f H( Ba2+) = -349 + 216 + 4.5

⇒ f H( Ba2+) = -128.5 kcal/mol

Answer: (3)

NEET (UG) 2025

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2

C(s) + 2H2(g) CH4(g); H = -74.8 kJ mol-1. Which of the following diagrams gives an accurate representation of the above reaction? [R reactants; P products]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2025
3

In which of the following processes entropy increases? Choose the correct answer from the options given below:

  1. A and C
  2. A, B and D
  3. A, C and D
  4. C and D
NEET (UG) 2024
4

Match List I with List II. Choose the correct answer from the options given below:

  1. A-IV, B-III, C-II, D-I
  2. A-IV, B-II, C-III, D-I
  3. A-I, B-II, C-III, D-IV
  4. A-II, B-III, C-IV, D-I
NEET (UG) 2024
5

The work done during reversible isothermal expansion of one mole of hydrogen gas at 25 from pressure of 20 atmosphere to 10 atmosphere is (Given R = 2.0 cal K-1 mol-1)

  1. 0 calorie
  2. -413.14 calories
  3. 413.14 calories
  4. 100 calories
NEET (UG) 2024
6

Choose the correct statement for the work done in the expansion and heat absorbed or released when 5 litres of an ideal gas at 10 atmospheric pressure isothermally expands into vacuum until volume is 15 litres :

  1. Both the heat and work done will be greater than zero
  2. Heat absorbed will be less than zero and work done will be positive
  3. Work done will be zero and heat will also be zero
  4. Work done will be greater than zero and heat will remain zero
RE-NEET (UG) 2024
7

For an endothermic reaction: Choose the correct answer from the options given below:

  1. B and D
  2. C and D
  3. A and B
  4. A and C
RE-NEET (UG) 2024
8

For the following reaction at 300 K A2(g) + 3B2(g) 2AB3(g) the enthalpy change is +15 kJ, then the internal energy change is :

  1. 19988.4 J
  2. 200 J
  3. 1999 J
  4. 1.9988 kJ
RE-NEET (UG) 2024
9

Which amongst the following options is the correct relation between change in enthalpy and change in internal energy?

  1. H = U + ng RT
  2. H - U = - n RT
  3. H + U = n R
  4. H = U - ng RT
NEET (UG) 2023
10

Which of the following p-V curve represents maximum work done?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2022
11

One mole of an ideal gas at 300 K is expanded isothermally from 1 L to 10 L volume. U for this process is : (Use R = 8.314 J K-1 mol-1)

  1. 0 J
  2. 1260 J
  3. 2520 J
  4. 5040 J
NEET (UG) 2022 (Phase 2)

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