Element X reacts with element Y to form a compound Z. During the formation of compound Z atoms of X lose 1 electron each whereas Y atoms gain 1 electron each. Which of the following properties is not shown by compound Z?

Element X reacts with element Y to form a compound Z. During the formation of compound Z atoms of X lose 1 electron each whereas atoms gain 1 electron each. 

As in this reaction gain and loss of electrons can be seen therefore the compound formed will be an ionic compound. We know the property of ionic compounds is high melting and boiling point, they occur as solids and conduct electricity in their molten state.

The property of low melting point will not be shown by compound Z.