APPSC Group-I Preliminary Exam 2004 Solved Paper 2

Which of the following statements are not true about gold?
a. It is a soft metal.
b. It has density; $21/2$ times that of iron.
c. Ornaments cannot be made of pure gold.
d. Gold is not easily scratched.
e. In 18 carat gold,we find 25 percent copper.
f. One carat represents $\frac{100}{24}$ percent.