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Chemistry — Stream SA

Atomic structure, periodic table, chemical bonding, and basic reactions for Class 11

Key Concepts

  • Atomic structure and quantum numbers
  • Mole concept and stoichiometry
  • Periodic trends in the elements
  • Basics of chemical bonding

Important Formulae

Number of moles n = m/M
Ideal gas law PV = nRT
Max electrons in a shell 2n²

Quick Tips

  • Balance every equation before doing stoichiometry.
  • Learn periodic trends as patterns, not isolated facts.

Sample Practice Questions

  1. The atomic number of an element equals the number of:

    • Neutrons
    • Protons
    • Electrons and neutrons
    • Nucleons
    Show answer

    Answer: Protons

  2. Avogadro's number is approximately:

    • 6.022×10²³
    • 3.0×10⁸
    • 1.6×10⁻¹⁹
    • 9.8
    Show answer

    Answer: 6.022×10²³

  3. The most abundant gas in the Earth's atmosphere is:

    • Oxygen
    • Nitrogen
    • Carbon dioxide
    • Hydrogen
    Show answer

    Answer: Nitrogen

  4. An acidic solution has a pH that is:

    • Less than 7
    • Equal to 7
    • Greater than 7
    • Equal to 14
    Show answer

    Answer: Less than 7

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Practice Questions

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Frequently Asked Questions

What are the key concepts in Chemistry — Stream SA for KVPY?

Atomic structure and quantum numbers; Mole concept and stoichiometry; Periodic trends in the elements; Basics of chemical bonding.

Which formulae are important for Chemistry — Stream SA in KVPY?

Number of moles: n = m/M; Ideal gas law: PV = nRT; Max electrons in a shell: 2n².

How can I practise KVPY Chemistry — Stream SA questions for free?

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Chemistry