At room temperature, CsF is expected to be:. a. a soft solid.
b. a conducting solid.
c. a gas.
d. a brittle solid.
e. a liquid.

d. a brittle solid.

Explanation:

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In this case, since cesium fluoride is widely known as an ionic compound due to the large electronegativity difference, it is possible to discard a. due to its crystalline structure, b. because conducting solids are metals, c. because ionic compounds are not likely to be gases and e. because even when it is soluble in water, the problem is not referring to an aqueous solution; therefore, the answer is d. a brittle solid.

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