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 sho...

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 OP suggests that X is in the

Answer Details

The graph shows the temperature changes of a sample X as it was melted, heated to 358 K, and allowed to cool. The section OP of the graph represents a horizontal line at a temperature of 358 K. This indicates that during the time period represented by OP, the temperature of sample X did not change. Therefore, the sample X must have been in a state where its temperature was constant, which is either the solid or liquid state. However, since the sample was melted before being heated to 358 K, it must have been in the liquid state during the time period represented by OP. Therefore, the correct answer is that X is in the liquid state during section OP.