Which of the Following Statements Concerning Calcium Is False

Multiple Choice

Which of the following statements concerning calcium is false?

A) Calcium metal is produced by the reduction of calcium oxide by aluminum.
B) Coral reefs are composed mainly of calcium hydroxide.
C) The mineral gypsum is composed of calcium sulfate dihydrate.
D) Calcium reacts with hydrogen to produce calcium hydride.
E) Seashells are composed principally of calcium carbonate.