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Is Matter Around Us Pure — Science STD 9 — Question

Gujarat 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.
  • ✓
    Hydrogen.
  • C
    Oxygen.
  • D
    Carbon.
✓

Answer

Correct option: B.
Hydrogen.
Washing soda $($soda ash$), Na _2 CO _3$ contains $Na , C$ and $O$ , whereas baking soda, $\text{NaHCO} _3$, 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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