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Chemistry — Stream SX/SB

Organic mechanisms, electrochemistry, and advanced physical chemistry for Class 12 / college

Key Concepts
  • Chemical thermodynamics and spontaneity
  • Chemical and ionic equilibrium
  • Electrochemistry and the Nernst equation
  • Organic reaction mechanisms
Important Formulae
Gibbs free energy ΔG = ΔH − TΔS
Nernst equation E = E° − (RT/nF) ln Q
pH pH = −log[H⁺]
Quick Tips
  • ΔG < 0 means spontaneous; ΔG = 0 means equilibrium.
  • For organic problems, identify the nucleophile and electrophile first.
Sample Practice Questions

  1. At 25 °C, pH + pOH equals:

    • 7
    • 10
    • 14
    • 1
    Show answer

    Answer: 14

  2. Oxidation is defined as the:

    • Gain of electrons
    • Loss of electrons
    • Gain of protons
    • Loss of neutrons
    Show answer

    Answer: Loss of electrons

  3. A reaction with ΔG < 0 is:

    • Non-spontaneous
    • Spontaneous
    • At equilibrium
    • Impossible
    Show answer

    Answer: Spontaneous

  4. The Nernst equation relates electrode potential to:

    • Temperature only
    • Concentration
    • Pressure only
    • Colour
    Show answer

    Answer: Concentration

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Practice Questions

Practise KVPY questions on Chemistry — Stream SX/SB. Answers are revealed after each question.

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Chemistry