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Acids, Bases and Salts — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceAcids, Bases and Salts1 Mark
MCQ
A student prepared 20% sodium hydroxide solution in a beaker containing water. The observations noted by him are given below.

  1. Sodium hydroxide is in the form of pellets.
  2. It dissolves in water readily.
  3. The beaker appears cold when touched from outside.
  4. The red litmus paper turns blue when dipped into the solution.

The correct observations are:

    • A
      I, II and III
    • B
      II, III and IV
    • C
      III, IV and I
    • D
      I, II and IV
    ✓

    Answer

    1. I, II and IV.

    ​​​​​​​Explanation:

    Sodium hydroxide is in the form of pallets and it readily dissolves in water to form a solution. Since, it is basic in nature, NaOH turns red litmus paper blue.

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