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Indian Navy Pilot Equilibrium Constant — practice questions

Explore 30 free Equilibrium Constant questions in Indian Navy Pilot Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Equilibrium Constant questions and exercises with answers

Showing questions 1–30 of 30.

For the reaction N2 + 3H2 ⇌ 2NH3, increasing pressure favours:Read the answer and worked solution →A weak base BOH has Kb = 1.8 × 10⁻⁵. pH of 0.1 M solution is approximately:Read the answer and worked solution →For the reaction H2(g) + I2(g) ⇌ 2HI(g) with Kc = 50 at 800 K, if [H2] = [I2] = 0.01 M initially, equilibrium [HI]:Read the answer and worked solution →As per your syllabus, if the reaction quotient Q is LESS than the equilibrium constant K, the reaction proceeds in which direction?Read the answer and worked solution →As per your syllabus, if Kc > 10³, what does this magnitude indicate about the reaction at equilibrium?Read the answer and worked solution →As per your syllabus, the conjugate base of a STRONG acid is necessarily which kind of base?Read the answer and worked solution →Match each scientist to their contributionRead the answer and worked solution →Ionic or covalent?Read the answer and worked solution →Complete the driver of bond formationRead the answer and worked solution →Single, double and triple bondsRead the answer and worked solution →True or false: Lewis structuresRead the answer and worked solution →Complete the definition of resonanceRead the answer and worked solution →Tap every bond parameter the chapter namesRead the answer and worked solution →True or false: ionic solidsRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Bonded pair or lone pair?Read the answer and worked solution →Flip and pair: term with meaningRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Order the reasoning: why resonance is neededRead the answer and worked solution →Reading the definitions backRead the answer and worked solution →True or false: what bond parameters affectRead the answer and worked solution →Bond parameters in useRead the answer and worked solution →Which parameter answers this?Read the answer and worked solution →True or false: resonanceRead the answer and worked solution →Order the steps: draw a Lewis structureRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Assertion and reason: structureRead the answer and worked solution →Flip and pair: parameter with what it measuresRead the answer and worked solution →

Worked practice questions

For the reaction N2 + 3H2 ⇌ 2NH3, increasing pressure favours:

  1. Forward (fewer moles on RHS)
  2. Random direction
  3. No effect
  4. Reverse
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Correct answer: A. Forward (fewer moles on RHS)

Reactants have 4 moles of gas (1 N2 + 3 H2), products have 2 moles (2 NH3). Increasing pressure shifts equilibrium toward fewer moles, hence toward products. This is the basis of Haber's process.

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A weak base BOH has Kb = 1.8 × 10⁻⁵. pH of 0.1 M solution is approximately:

  1. 9
  2. 11
  3. 3
  4. 8
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Correct answer: B. 11

[OH-] ≈ √(Kb × C) = √(1.8 × 10⁻⁶) ≈ 1.34 × 10⁻³. pOH = -log(1.34 × 10⁻³) ≈ 2.87. pH = 14 - 2.87 ≈ 11.13.

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For the reaction H2(g) + I2(g) ⇌ 2HI(g) with Kc = 50 at 800 K, if [H2] = [I2] = 0.01 M initially, equilibrium [HI]:

  1. 0.020
  2. 0.005
  3. 0.014
  4. 0.010
Show answer and solution

Correct answer: C. 0.014

Let x = HI formed. Then [H2] = [I2] = 0.01 - x/2. Kc = x²/((0.01-x/2)²) = 50. So x/(0.01-x/2) = √50 ≈ 7.07. x ≈ 7.07(0.01 - x/2) = 0.0707 - 3.535x. 4.535x = 0.0707, x ≈ 0.0156. Approximate [HI] ≈ 0.014 M.

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