Alkali metals react vigorously with cold water resulting in the displacement of ___________.

This question was previously asked in
SSC CHSL 2020 Official Paper 9 (Held On: 15 April 2021 Shift 3)
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  1. hydrogen
  2. oxygen
  3. carbon dioxide
  4. nitrogen

Answer (Detailed Solution Below)

Option 1 : hydrogen
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SSC CHSL Exam 2023 Tier-I Official Paper (Held On: 02 Aug 2023 Shift 1)
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Detailed Solution

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The correct answer is hydrogen.

Important Points 

  • Alkali Metals:
    • Alkali metals react vigorously with cold water resulting in the displacement of hydrogen.
    • Hydrogen (H), lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr) are called alkali metals.
    • Alkali metals are soft, shiny, low-melting, highly reactive metals, which tarnish when exposed to air. 
    • Alkali metals are very reactive, they are found in their elemental form in nature, and are usually found as ionic compounds (except for hydrogen).
    • They have only one valence electron in the highest-energy orbitals (ns1). 
    • They have low melting points.
    • These elements react vigorously with water and produce metal hydroxide, hydrogen gas, and heat. 
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