Chapter 7: Environmental Chemistry Ii Water Chemistry For High School - Grade 10(Chemistry ) Questions and Answers

Question 1. The ratio of hydrogen (H) and oxygen (O) in water molecule by volume is
  1.    0.0840277777777778
  2.    0.0430555555555556
  3.    0.125694444444444
  4.    0.167361111111111
Explanation:-
Answer: Option A. -> 0.0840277777777778
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2. What is the fourth step of raw water treatment?
  1.    sedimentation
  2.    coagulation
  3.    filtration
  4.    chlorination
Explanation:-
Answer: Option D. -> chlorination
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 3. The density of water becomes maximum at
  1.    10 °C
  2.    4 °C
  3.    5 °C
  4.    12 °C
Explanation:-
Answer: Option B. -> 4 °C
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 4. Step of sewage water treatment in which sewage is placed in tanks and aerated with large blowers is called
  1.    primary sewage treatment
  2.    secondary sewage treatment
  3.    activated sludge treatment
  4.    chlorination
Explanation:-
Answer: Option C. -> activated sludge treatment
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 5. The hardness that cannot be removed by boiling is called
  1.    temporary hardness
  2.    permanent hardness
  3.    semi temporary hardness
  4.    semi permanent hardness
Explanation:-
Answer: Option B. -> permanent hardness
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 6. What is the percentage of water from rivers and lakes?
  1.    0
  2.    0.002
  3.    0.006
  4.    0.021
Explanation:-
Answer: Option B. -> 0.002
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 7. Step of sewage water treatment in which there are some aeration and organic material is converted to inorganic materials is called
  1.    primary sewage treatment
  2.    secondary sewage treatment
  3.    activated sludge treatment
  4.    chlorination
Explanation:-
Answer: Option B. -> secondary sewage treatment
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 8. Permanent hardness of water is caused due to the presence of dissolved
  1.    calcium hydrogen carbonates
  2.    magnesium hydrogen carbonates
  3.    chlorides of magnesium
  4.    Sulphates of magnesium
Explanation:-
Answer: Option D. -> Sulphates of magnesium
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 9. What percentage of fresh water is available to man?
  1.    0.2
  2.    0.02
  3.    0.002
  4.    0.0002
Explanation:-
Answer: Option C. -> 0.002
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 10. What is the second step of raw water treatment?
  1.    sedimentation
  2.    coagulation
  3.    filtration
  4.    chlorination
Explanation:-
Answer: Option B. -> coagulation
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
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