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Is Matter Around Us Pure — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure1 Mark
MCQ
The element which is not common between the compounds called baking soda and soda ash is:
  • A
    Sodium.
  • B
    Hydrogen.
  • C
    Oxygen.
  • D
    Carbon.
✓

Answer

  1. Hydrogen.

Explanation:

Washing soda (soda ash), Na2CO3 contains Na, C and O, whereas baking soda, NaHCO3, is made up of Na, C, H and O. So, the element, which is not common in the two, is hydrogen.

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