Consider the following statements |
1. Limestone, chalk and marble are different forms of calcium carbonate |
2. When pH of rain water is less than 5.6, it is called acid rain. |
3. Human body works with in the pH range of 7.0 to 7.8 |
Which of the statements given above are correct? |
A) 1 and 2
B) 1 and 3
C) 2 and 3
D) 1, 2 and 3
Correct Answer: D
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