Use the graph above to answer this question A s... - JAMB Chemistry 1997 Question

Use the graph above to answer this question. A sample, X, solid at room temperature, was melted, heated to a temperature of 358 K and allowed to cool as shown in OPQR. The section PQ indicates that X is

A

a mixture of salts

B

a hydrated salt

C

an ionic salt

D

a pure compound

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Correct Option: D

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