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Which of the following properties is INCORRECT when an alkali metal is dissolved in liquid ammonia?

1. A deep blue solution is observed.
2. The resulting solution is paramagnetic in nature.
3. The resulting solution acts as an oxidising agent.
4. The resulting solution acts as a reducing agent.

Correct answer: The resulting solution acts as an oxidising agent.

Solution

When an alkali metal (e.g., Na) dissolves in liquid ammonia: Na -> Na+(am) + e-(am). The ammoniated electron gives a deep blue colour, is paramagnetic (unpaired electron), and is a powerful reducing agent. It CANNOT act as an oxidising agent. So option C is incorrect.

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