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Hydrogen and s - block Elements — Syllabus

Telangana Open School (TOSS) · Class 12 · Chemistry

What Hydrogen and s - block Elements covers in Telangana Open School (TOSS) Class 12 Chemistry: 4 topics, for the 2026-27 session.

46 questions30 flashcards4 concepts

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4 Topics · Telangana Open School (TOSS) Class 12 Chemistry · 2026-27

Topics in Hydrogen and s - block Elements

1

Hydrogen: Position and Isotopes

  • Hydrogen has electronic configuration 1s¹ and resembles both alkali metals (ns¹) and halogens (gains one electron to form H⁻).
  • It is placed separately in the periodic table due to its unique behavior.
  • Three isotopes: Protium (¹H), Deuterium (²H or D), Tritium (³H or T).
2

Compounds of Hydrogen

  • Hydrides are binary compounds of hydrogen: ionic (e.g., NaH), covalent (e.g., CH₄), and metallic (e.g., LaH₂.₈₇).
  • Water (H₂O) is polar and forms hydrogen bonds; ice floats due to open cage-like structure.
  • Heavy water (D₂O) is used as a moderator in nuclear reactors.
3

s-Block Elements: Alkali Metals (Group 1)

  • General electronic configuration: ns¹.
  • Reactivity increases down the group due to decreasing ionization enthalpy.
  • Form +1 ions; compounds are mostly ionic.
4

s-Block Elements: Alkaline Earth Metals (Group 2)

  • General electronic configuration: ns².
  • Form +2 ions; reactivity increases down the group.
  • Less electropositive than alkali metals.

Key Concepts

Central concept: Hydrogen and s-Block Elements

HydrogenWater and Heavy WaterHydrogen Peroxide (H₂O₂)s-Block ElementsCompounds of s-Block ElementsHard and Soft WaterBiological Importance of Na, K, Mg, Ca

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Frequently Asked Questions

What are the important topics in Hydrogen and s - block Elements for Telangana Open School (TOSS) Class 12 Chemistry?
Key topics in Hydrogen and s - block Elements include Hydrogen: Position and Isotopes, Compounds of Hydrogen, s-Block Elements: Alkali Metals (Group 1), s-Block Elements: Alkaline Earth Metals (Group 2). Study these first, then practise questions on each for the Telangana Open School (TOSS) Class 12 board exam.
How should I revise Hydrogen and s - block Elements for the Telangana Open School (TOSS) Class 12 board exam?
Learn the core ideas first, then work through the 46 practice questions on Hydrogen and s - block Elements. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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