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Test: Chlorination - Civil Engineering (CE) MCQ


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10 Questions MCQ Test - Test: Chlorination

Test: Chlorination for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Test: Chlorination questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Chlorination MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Chlorination below.
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Test: Chlorination - Question 1

At what pH, chlorine exists as molecular chlorine?

Detailed Solution for Test: Chlorination - Question 1

When chlorine is added to water, the chlorine acts as molecular chlorine only when its pH is less than 5.

Test: Chlorination - Question 2

Which of the following is termed as free available chlorine?

Detailed Solution for Test: Chlorination - Question 2

The chlorine existing in water as hypochlorous acid, hypochlorite ions, molecular chlorine is termed as free available chlorine.

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Test: Chlorination - Question 3

At what pH, chlorine in water acts as only hypochlorite ions?

Detailed Solution for Test: Chlorination - Question 3

HOCl <——> H+ + HOCl
Where, HOCl is hypochlorous acid and HOCl is hypochlorite ions.
At pH<10, only HOCl is produced.

Test: Chlorination - Question 4

When the pH is between 5 and 10, the chlorine in the water acts as ______

Detailed Solution for Test: Chlorination - Question 4

When the pH is between 5 and 10, the chlorine in the water acts as hypochlorous acid and hypochlorite ions. As pH increases, the concentration of hypochlorous acid decreases while of hypochlorite ions increases.

Test: Chlorination - Question 5

Chlorine which gets consumed in the oxidation of impurities before disinfection is ____

Detailed Solution for Test: Chlorination - Question 5

Chlorine has the oxidizing power which oxidizes organic and inorganic impurities present in water and the amount of chlorine, which gets consumed before disinfection is called as chlorine demand.

Test: Chlorination - Question 6

The hypochlorous acid is ______ times effective as hypochorite ions.

Detailed Solution for Test: Chlorination - Question 6

The hypochlorous acid is 80 times more effective as hypochorite ions, so the pH of water to be treated should be less than 7 to prevent the ionization of it.

Test: Chlorination - Question 7

The permissible limit of free residual chlorine is ___

Detailed Solution for Test: Chlorination - Question 7

The water is satisfactorily disinfected if the free residual chlorine is 0.2 ppm at the contact period of 10 minutes.

Test: Chlorination - Question 8

The chlorine, which serves as a disinfectant is ____

Detailed Solution for Test: Chlorination - Question 8

When chlorine demand is fulfilled, then chlorine is available s free residual chlorine, which contains hypochlorous acid and hypochlorite ions.

Test: Chlorination - Question 9

Bleaching powder contains ______ of available chlorine.

Detailed Solution for Test: Chlorination - Question 9

Bleaching powder contains 33.3% of available chlorine. It loses its strength during storage and therefore, it is used during emergency conditions.

Test: Chlorination - Question 10

What is the chemical formula of bleaching powder?

Detailed Solution for Test: Chlorination - Question 10

The chemical formula of bleaching powder is Ca (OCl)2. It is called as chlorinated lime.

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