Spectroscopy, Thermodynamics and Electrochemistry

JKPSC Assistant Professor (Chemistry) · Chemistry · 120 practice questions with answers and explanations: 43 Easy, 77 Medium, 0 Hard.

Sample questions

Sample Easy question 1

How many moles are there in 32 g of CH₄? (Molar mass = 16 g/mol)

  1. 3
  2. 2
  3. 1
  4. 4
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Answer: B. Moles = mass/molar mass = 32/16 = 2.

Sample Easy question 2

What is the mass of 5 mol of NaOH? (Molar mass = 40 g/mol)

  1. 200
  2. 45
  3. 100
  4. 400
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Answer: A. Mass = moles × molar mass = 5 × 40 = 200 g.

Sample Easy question 3

What volume (in litres) do 2 moles of an ideal gas occupy at STP? (Molar volume 22.4 L)

  1. 44.8
  2. 11.2
  3. 24.4
  4. 22.4
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Answer: A. V = n × 22.4 = 44.8 L.

Sample Medium question 4

The Le Chatelier principle states that a system at equilibrium:

  1. Is unstable
  2. Shifts to oppose a change
  3. Is unaffected
  4. Moves to the right
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Answer: B. It applies to changes in P, T and concentration.

Sample Medium question 5

The Joule–Thomson coefficient is zero at the:

  1. Melting point
  2. Boiling point
  3. Critical point
  4. Inversion temperature
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Answer: D. The gas neither heats nor cools.

Sample Medium question 6

The unit of the rate constant of a first-order reaction is:

  1. mol L⁻¹ s⁻¹
  2. mol s⁻¹
  3. s⁻¹
  4. L mol⁻¹ s⁻¹
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Answer: C. Rate = k[A] gives k in time⁻¹.

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