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Indian Navy Pilot Chemical Equilibrium — practice questions

Explore 59 free Chemical Equilibrium questions in Indian Navy Pilot Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Chemical Equilibrium questions and exercises with answers

Showing questions 1–30 of 59.

The radius of the $n$-th Bohr orbit of a hydrogen-like atom of atomic number $Z$ varies as:Read the answer and worked solution →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 →Which trend is followed by ionisation energy across a period?Read the answer and worked solution →Three elements B, Si and Ge areRead the answer and worked solution →Order the atomic models as they were proposedRead the answer and worked solution →Match each scientist to their modelRead the answer and worked solution →Match each model to what it could NOT explainRead the answer and worked solution →True or false: Rutherford's modelRead the answer and worked solution →True or false: Bohr's modelRead the answer and worked solution →Complete the reason Bohr's model failsRead the answer and worked solution →Which model does this belong to?Read the answer and worked solution →Match each quantum number to what it is calledRead the answer and worked solution →True or false: the quantum mechanical modelRead the answer and worked solution →Order the structure: from atom down to electronRead the answer and worked solution →Complete the (n + l) ruleRead the answer and worked solution →True or false: orbital energiesRead the answer and worked solution →Match each rule to what it forbids or requiresRead the answer and worked solution →Tap every statement Hund's rule requiresRead the answer and worked solution →The fundamental particlesRead 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 →Which principle is being described?Read the answer and worked solution →Flip and pair: symbol with meaningRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →

Worked practice questions

The radius of the $n$-th Bohr orbit of a hydrogen-like atom of atomic number $Z$ varies as:

  1. $r \propto n / Z^2$
  2. $r \propto Z / n^2$
  3. $r \propto n^2 / Z$
  4. $r \propto Z n^2$
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Correct answer: C. $r \propto n^2 / Z$

From Bohr's derivation, $r_n = \dfrac{n^2 h^2}{4\pi^2 m k Z e^2}$, hence $r_n \propto n^2 / Z$. **Therefore higher orbits are larger ($n^2$) and higher-$Z$ atoms hold their electrons in tighter orbits ($1/Z$).**

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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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More Chemistry topics

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