Which of the following statements about He is false?
a. It is an inert gas.
b. It is odorless.
c. It is nonflammable.
d. It is heavier than air.
ANS: D
Helium is second only to hydrogen as the lightest of all gases; it has a density at STPD of 0.1785 g/L. Helium is odorless, tasteless, nonflammable, and chemically and physiologically inert.
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