Which of the following is a false statement?

A. Solid substances need different temperature of heat to melt them.

B. All solid substances require the same temperature and heat to melt them.

C. Heat is sometimes necessary to change physical property of an object.

a:

by the combination of an unlimited number of elements

hcl + naoh → h2o + nacl

explanation:

hcl + naoh → h2o + nacl   is the reaction that is correctly balanced.

however, pcl3 + h2 → ph3 +3hcl, 2ca+ 3cl2 → cacl3, and c5h12 + 5o2 → 5co2 + 6h2o are not correctly balanced.