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NEET UG Chemical Thermodynamics — practice questions — page 2

Explore 45 free Chemical Thermodynamics questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Chemical Thermodynamics questions and exercises with answers

Showing questions 31–45 of 45.

If K_c for a reaction is 4, the equilibrium constant for the reverse reaction is:Read the answer and worked solution →For N₂ + 3H₂ ⇌ 2NH₃, increasing the total pressure shifts the equilibrium:Read the answer and worked solution →Adding an inert gas at constant volume to a gaseous equilibrium:Read the answer and worked solution →For an exothermic reaction at equilibrium, raising the temperature:Read the answer and worked solution →The pH of a 0.01 M HCl solution is:Read the answer and worked solution →K_w (ionic product of water at 25 °C) is:Read the answer and worked solution →A buffer solution is most resistant to pH change when:Read the answer and worked solution →K_sp of a sparingly soluble salt AB at 25 °C is 4 × 10⁻¹⁰. Molar solubility s of AB is:Read the answer and worked solution →The atomic number Z of an element is defined asRead the answer and worked solution →The radius of the nth Bohr orbit of hydrogen is proportional toRead the answer and worked solution →The energy of the electron in the nth Bohr orbit of hydrogen isRead the answer and worked solution →The maximum wavelength in the Lyman series of the hydrogen spectrum (transition n₂ → 1) corresponds to n₂ =Read the answer and worked solution →Which series of the hydrogen spectrum lies in the visible region?Read the answer and worked solution →The relationship E = hν (Planck) between photon energy and frequency contains constant h that is approximatelyRead the answer and worked solution →For a hydrogen-like ion of atomic number Z, the energy of the nth level isRead the answer and worked solution →

Worked practice questions

If K_c for a reaction is 4, the equilibrium constant for the reverse reaction is:

  1. 4.00
  2. −4.0
  3. 0.25
  4. 16.0
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Correct answer: C. 0.25

1. K_reverse = 1 / K_forward. 2. = 1 / 4 = 0.25. 3. Negative K is meaningless; squaring relates to doubling the equation, not reversing. _Source: syllabus Chem Ch 7 §7.4 Reverse Reaction_

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For N₂ + 3H₂ ⇌ 2NH₃, increasing the total pressure shifts the equilibrium:

  1. Towards the reactants
  2. Reaction stops here
  3. No shift either way
  4. Towards the products
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Correct answer: D. Towards the products

1. Apply Le Chatelier: a pressure increase favours the side with FEWER moles of gas. 2. Left side has 4 moles (1 + 3) of gas, right has 2 (NH₃). 3. So equilibrium shifts towards products (NH₃ formation). 4. This is why the Haber process runs at high pressure. _Source: syllabus Chem Ch 7 §7.6 Factors Affecting Equilibrium_

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Adding an inert gas at constant volume to a gaseous equilibrium:

  1. Shifts equilibrium towards products
  2. Shifts equilibrium towards reactants
  3. Does not shift the equilibrium
  4. Stops the reaction
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Correct answer: C. Does not shift the equilibrium

1. At constant volume, partial pressures of the reacting species do not change when an inert gas is added. 2. Total pressure rises, but P_A, P_B etc are unchanged. 3. Reaction quotient Q = K_p still — no shift. 4. At constant PRESSURE (not volume), inert gas addition decreases reactant partial pressures and CAN shift equilibrium. _Source: syllabus Chem Ch 7 §7.6 Effect of Inert Gas_

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