As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is
A. Smaller
B. Larger
C. Same
D. None of the above
Answer: Option A
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Option a is correct cause if high ph value means it's alkaline and low ph means acidic.So contact period for acidic will be smaller as compared to alkaline .
@admin, It should be answer B
Option b is correct u put an wrong option