True or false

Question

A. Copper can have many effects on human health
B. The raw materials needed to manufacture circuit boards can be used in their natural form
C. In circuit board etching,one of the starting substances is copper chloride solution
D. The toxic effects of copper are not yet known
E. The etching solution is different after etching than it was before etching

Answer 1

A. True
B. False
C. True
D. False
E. True