Is Matter Around Us Pure? — Science STD 9 — Question
Rajasthan BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure?1 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$), \ce{Na2CO3}$ contains $Na, C$ and $O,$ whereas baking soda$, \ce{NaHCO3},$ 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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