Acid changes the colour of blue litmus to ________.

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SSC CGL 2022 Tier-I Official Paper (Held On : 08 Dec 2022 Shift 1)
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  1. yellow
  2. red
  3. pink
  4. orange

Answer (Detailed Solution Below)

Option 2 : red
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The correct answer is Red.

Key Points

  •  Acid
    • Acid changes the colour of blue litmus to Red.
    • A Brnsted-Lowry acid or Lewis acid is a molecule or ion that can either donate a proton (the hydrogen ion, H+) or establish a covalent bond with an electron pair. Proton donors, also known as Brnsted-Lowry acids, are the first class of acids.
    • Proton donors, also referred to as Arrhenius acids, generate the hydronium ion H3O+ under the unique situation of aqueous solutions.
    • The Arrhenius theory was expanded upon by Brnsted and Lowry to take non-aqueous solvents into account.
    • A hydrogen atom is typically bound to a chemical structure in a Brnsted or Arrhenius acid that is still energetically advantageous after the loss of H+.

Additional Information

  • Aqueous Arrhenius acids have distinguishing characteristics that serve as a useful definition of an acid. Acids can turn blue litmus red, produce aqueous solutions with a sour taste, and react with bases and some metals (like calcium) to generate salts.
  • The Latin word acidus, which means "sour," is where the word acid comes from. While the technical definition solely refers to the solute, an aqueous solution of an acid with a pH lower than 7 is sometimes commonly referred to as "acid" (as in "dissolved in acid"..
  • Higher acidity and, thus, a higher concentration of positive hydrogen ions in the solution are indicative of a lower pH
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