Question : The pH value of acid rain is:
Option 1: Less than 7
Option 2: Exactly 7
Option 3: Greater than 7
Option 4: It varies
Correct Answer: Less than 7
Solution : The correct answer is (a) Less than 7
Acid rain is characterized by having a pH value that is less than 7 , indicating acidity. Normal, unpolluted rainwater has a pH value close to 5.6 , which is slightly acidic due to the presence of carbon dioxide in the atmosphere. However, when rainwater combines with pollutants, particularly sulfur dioxide (SO2) and nitrogen oxides (NOx) emitted from human activities like burning fossil fuels, the pH of the rainwater decreases further, making it more acidic. Acid rain can have detrimental effects on the environment, including the acidification of lakes, rivers, and soils, which can harm aquatic life, vegetation, and ecosystem health.
Question : Direction: If a number is greater than 5 but less than 9 and greater than 7 but less than 11, the number is?
Option 1: 5
Option 2: 6
Option 3: 7
Option 4: 8
Question : Which of the following statements is correct?
Option 1: Living organisms can survive a wide range of pH changes.
Option 2: When the pH of rainwater is less than 8.2, it is called acid rain.
Option 3: Our body works within the pH range of 7.0 to 7.8.
Option 4: Tooth decay starts when the pH of the mouth is lower than 1.5.
Question : The pH of lemon juice is expected to be
Option 1: equal to 7
Option 2: nothing can be predicted
Option 3: less than 7
Option 4: more than 7
Question : Which of the following acids makes the pH of vinegar acidic?
Option 1: Tartaric acid
Option 2: Citric acid
Option 3: Linoleic acid
Option 4: Acetic acid
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