Which of the following statements is INCORRECT about ammonium nitrate?
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A.
It is highly soluble in water.
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B.
It decomposes at the temperature 210°C-260°C.
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C.
It is hygroscopic in nature.
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D.
It has pH more than 7.5.
Correct Answer:
D. It has pH more than 7.5.
Explanation:
The statement that ammonium nitrate has a pH greater than 7.5 is incorrect because the compound is actually acidic. When ammonium nitrate (NH4NO3) dissolves in water, it dissociates into ammonium (NH4+) and nitrate (NO3-) ions. The ammonium ion acts as a weak conjugate acid that can release a proton into the solution, typically resulting in a pH value between 4.5 and 6.0. Furthermore, ammonium nitrate is highly soluble in water, hygroscopic (meaning it readily absorbs moisture from the air), and begins to undergo thermal decomposition when heated to temperatures between 210°C and 260°C. Since it produces an acidic solution rather than a basic one, the claim of a pH above 7.5 is false.
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