1. What is the pH value of water ?
A. 3
B. 4.5
C. 6.5
D. 7
ANSWER:D.7
SOLUTION : Pure water has a pH of 7, which is neutral on the pH scale. The pH scale ranges from 0 to 14, with 0 being the most acidic and 14 being the most basic. A pH less than 7 indicates acidity, while a pH greater than 7 indicates a base.
2. What is the pH value of sea water ?
A. 7
B. 8
C. 8.1
D. 8.5
ANSWER:C.8.1
SOLUTION:Seawater typically has a pH of around 8.2, but it can range from 7.5 to 8.5 depending on the local salinity and other conditions. Seawater is slightly basic, or alkaline, because of the dissolved minerals it carries.
3. What is the pH value of saliva?
A. 6
B. 5.5
C. 6 to 7
D. 6.5 to 7.5
ANSWER :D.6.5 to 7.5
SOLUTION:The saliva that basically forms the environment of the oral cavity is the resting or pooled saliva. Saliva has a pH normal range of 6.2-7.6 with 6.7 being the average pH.
4. What is the pH value of Tear?
A. 7.2
B. 7.4
C. 6.2
D. 6.4
ANSWER: B.7.4
SOLUTION:The normal pH range was 6.5 to 7.6; the mean value was 7.0. This method provides a rapid and accurate measure of tear pH and may better our understanding of tear physiology and tear buffering capacity.
5. What is the pH value of Milk ?
A. 6.4
B. 6.5
C. 7.4
D. 8.5
ANSWER: A.6.4
SOLUTION: Milk fresh from the cow typically has a pH between 6.5 and 6.7. The pH of milk changes over time. As milk goes sour, it becomes more acidic and the pH gets lower. This occurs as bacteria in milk convert the sugar lactose into lactic acid.
6. What is the pH value of vinegar?
A. 2
B. 3
C. 4
D. 6
ANSWER: B.3
SOLUTION: Vinegar is very acidic, with a pH of 2–3. Apple cider vinegar is nutritionally similar to other types of vinegar. Some believe it’s more alkalizing than other vinegars, but there’s no evidence to support this.
7. What is the pH value of the blood ?
A. 5.4
B. 6.4
C. 7.4
D. 8.4
ANSWER: C.7.4
SOLUTION :
Your blood has a normal pH range of 7.35 to 7.45. This means that blood is naturally slightly alkaline or basic. In comparison, your stomach acid has a pH of around 1.5 to 3.5. This makes it acidic.
8. What is the pH value of the lemon?
A. 2.4
B. 3.4
C. 4.4
D. 5.4
ANSWER: A.2.4
SOLUTION:The pH value of lemon juice is between 2 and 3, making it acidic. This means that lemon juice is 10,000–100,000 times more acidic than water.
9. What is pH value of NACL ?
A. 5
B. 6
C. 9
D. 7
ANSWER:D.7
SOLUTION:The pH of NaCl or Sodium Chloride is considered to be 7. Sodium chloride is sometimes known as rock salt. The seawater consists of at least 1% – 5% NaCl.
10. What is the pH value of Acidic Mixture?
A. 7
B. 6
C. 9
D. 3
ANSWER: A.7
SOLUTION:
Anything below 7.0 is acidic, and anything above 7.0 is alkaline, or basic.