Match the following:
| Substance | pH |
|---|---|
| i. Human body | a. less than 5.6 |
| ii. Acid rain | less than 5.5 b. |
| iii. When tooth decay begins in the mouth | c. 7 to 7.8 |
1
ic, ii–b, iii–a
2
ic, ii-a, iii-b
3
i-a, ii-b, iii-c
4
i-a, ii-c, iii-b
Match the following:
| Substance | pH |
|---|---|
| i. Human body | a. less than 5.6 |
| ii. Acid rain | less than 5.5 b. |
| iii. When tooth decay begins in the mouth | c. 7 to 7.8 |