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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
correct option: d
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