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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. In electrolysis, reduction occurs at the:

    • Anode
    • Cathode
    • Salt bridge
    • Electrolyte
    Show answer

    Answer: Cathode

  2. A reaction with ΔG < 0 is:

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

    Answer: Spontaneous

  3. Oxidation is defined as the:

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

    Answer: Loss of electrons

  4. The Nernst equation relates electrode potential to:

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

    Answer: Concentration

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Practice Questions

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Frequently Asked Questions

What are the key concepts in Chemistry — Stream SX/SB for KVPY?

Chemical thermodynamics and spontaneity; Chemical and ionic equilibrium; Electrochemistry and the Nernst equation; Organic reaction mechanisms.

Which formulae are important for Chemistry — Stream SX/SB in KVPY?

Gibbs free energy: ΔG = ΔH − TΔS; Nernst equation: E = E° − (RT/nF) ln Q; pH: pH = −log[H⁺].

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Chemistry