Question on: JAMB Chemistry - 2024
The element which can combine with oxygen to form an acid anhydride of the form XO₂ is
A
phosphorus
B
Chlorine
C
fluorine
D
sulphur
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Correct Option: D
An acid anhydride is a non-metal oxide that reacts with water to form an acid. We are looking for an element (X) that combines with oxygen to form an oxide (XO₂) which, when reacting with water, produces an acid.
Phosphorus forms P₂O₅ → H₃PO₄, Chlorine forms Cl₂O₇ → HClO₄, Fluorine forms F₂O (does not readily form XO₂ acids), Sulphur forms SO₂ → H₂SO₃ and SO₃ → H₂SO₄. Therefore, Sulphur is the best fit.
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