Question 36
Question 36 of 40
Question image for Q36
Periodic Table
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No letter options?
Older MCQs might not have the typical A, B, C, D choices. They have choices 1, 2, 3, and a combination of them is the answer. Below is the key that maps such combinations to the answer.
A 1, 2 and 3 are correct
B 1 and 2 only are correct
C 2 and 3 only are correct
D 1 only is correct
Topics Tested
10. Chemistry of the envi...
10.3. Air quality and climate

State the composition of clean, dry air as approximately 78% nitrogen, ( N_2 ), 21% oxygen, ( O_2 ) and the remainder as a mixture of noble gases and carbon dioxide, ( CO_2 )