Optimum Coagulant Dosage - Viva

Formula of alum is ------------

• [Al₂(SO₄)₅ 18H₂0]

• [Al₃(SO₂)₃ 18H₂0]

• [Al₂(SO₄)₃ 18H₂0]

• [Al₂(SO₂)₂ 20H₂0]

Jar test device consists of _________ number of stirrers approximately.

• 1 - 2

• 4 - 6

• 12 - 20

• 90 - 140

Example of coagulant is/are ------------------- (Choose correct answers)

• Alum

• Copperas

• Sodium Aluminate

• Ferrous Sulphate

Stirring speed is reduced to promote -------------

• Turbidity formation

• Floc formation

• Both floc and turbidity formation

• None of above

Graph is plotted between turbidity in NTU against coagulant dosage to determine -------------------

Blank solution is used in colorimetric estimation to -----------

• Check the instrument

• Nullify the error caused by colour

• Nullify the error caused by the instrument

• Nullify the absorbance caused due to the colouring impurities present in the reagents

Coagulation along with turbidity removes

• Colour

• Taste

• Microorganisms

• All of the above

A jar test simulates the _________ process.

• Flocculation

• Coagulation

• Flocculation and coagulation

• None of above

When alum solution is added to water, the dissociated molecule is / are ---------------

• S²⁺

• SO₄^2-

• H⁺

• None of the above

The coagulation sedimentation plant is called -------------