Which of the following statements regarding O2 are true? 1. It is only slightly soluble in water. 2. It is odorless and transparent. 3. It is flammable. 4. It is heavier than air
a. 1 and 3 only
b. 1, 2, and 4 only
c. 3 and 4 only
d. 1, 2, 3 only
ANS: B
Oxygen is a colorless, odorless, transparent, and tasteless gas. It exists naturally as free molecular O2 and as a component of a host of chemical compounds. Oxygen constitutes almost 50% by weight of the earth's crust and occurs in all living matter in combination with hydrogen as water. At standard temperature, pressure, and dry (STPD), O2 has a density of 1.429 g/L, being slightly heavier than air (1.29 g/L). Oxygen is not very soluble in water.
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