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Which of the following compounds has the lowest melting point?

1. CaCl2
2. CaBr2
3. CaI2
4. CaF2

Correct answer: CaI2

Solution

The melting point decreases as the size of the halide ion increases due to weaker lattice energy. Among the given options, CaI2 has the largest halide ion (I-), resulting in the lowest melting point.

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