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Identify the d-block element that is liquid at room temperature, has a high specific heat, is less reactive than hydrogen, and whose chloride MX2 sublimes (is volatile) on heating.

1. Cu
2. Hg
3. Ce
4. Pm

Correct answer: Hg

Solution

Mercury (Hg) is the only metal that is liquid at room temperature; it lies below hydrogen in reactivity and its chloride HgCl2 is volatile/sublimable.

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