Question

Ozone is the major component of *




a. Troposphere



b. Stratosphere



c. Thermosphere



d. Exosphere
28. The pH value of acids ranges from *




a. 1 to 7



b. -1 to 1



c. 1 to 10



d. 1 to -10

Answer 1

Stratosphere

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Answer 2

Answer:

first = a

second I DON'T KNOW