Question

17. Which among the following is incorrect for the
oxygen gas?
A. Oxygen is a non-metal.
B. Oxygen constitutes about 21% of air.
C. Oxygen is the main component of water.
D. None of these​

Answer 1

Answer:

option B

Explanation:

it is because oxygen is 20.95percent in the whole air therefore round figure is 21 percent

Answer 2

Answer:

c. Oxygen is the main component of water

water constitutes of both oxygen and water