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Is Matter Around Us Pure? — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure?1 Mark
Question
The element which is not common between the compounds called baking soda and soda ash is:
  1. Sodium.
  2. Hydrogen.
  3. Oxygen.
  4. 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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