Question

The element which is not common between the compounds baking soda and soda ash is:A.NitrogenB.HydrogenC.OxygenD.Sulphur

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Hint:
The common name compounds which have the word ‘soda’ in the are usually compounds consisting of the element Sodium.

-Both soda ash and baking soda are common sodium compounds or salts that we use often in our day to day lives.
-Soda ash is the common name for the sodium salt whose chemical name is sodium carbonate.
-Similarly, baking soda is a more generic term for a sodium salt with the chemical name as sodium bicarbonate.
-The chemical formula for baking soda or sodium bicarbonate is $NaHC{O_3}$, while the chemical formula for soda ash or sodium carbonate is $N{a_2}C{O_3}$.
-From the above chemical formulae, we can determine that the common element between these two sodium compounds are
Sodium (Na)
Carbon (C)
Oxygen (O)
-Hydrogen is not common between the two compounds, it is present in at least one of them, unlike sulphur.

Hence, Option B is the correct option.

Note:
Although baking powder is known as sodium bicarbonate, the bicarbonate nomenclature does not indicate the existence of 2 carbonate molecules.