Surfactant and Emulsions

What type of emulsion is a w/o/w emulsion?

• Primary emulsion

• Microemulsion

• Multiple emulsion

• Monoemulsion

The purpose of an emulsifier is to ___________ .

• Decrease surface area in a suspension

• Reduce the interfacial tension between immiscible phase

• Minimize the size of globules

• Improve medication taste

What is the HLB_mixture for emulsion consisting of 30% Span 80 (HLB = 4.3) and 70% Tween 80 (HLB = 15)?

• 1.18
• 1.81
• 18.11
• 11.8

A substance that allows oil and water to mix or emulsify is known as ________ .

• Antioxidant

• Emulsifier/Surfactant

• Preservative

• Colouring agent

The tail of a surfactant molecule is oil-loving or known as ________?

• hydrophile

• lipophobic

• lipophilic

• hydrophilic

Oil and Water is an example of a(n)...

• Suspension

• Emulsion

• Colloid

• Solution

Ratio of oily phase to aqueous phase to gum of Fixed oil (eg. Castor Oil BP)

• 4 - 3 - 1

• 4 - 2 - 2

• 4 - 1 - 2

• 4 - 2 - 1

Ratio of oily phase to aqueous phase to gum of Volatile oil (eg. Cinnamon Oil BP)

• 2 - 2 - 1

• 2 - 2 - 2

• 2 - 1 - 2

• 2 - 1 - 1

The condition labelled as 'C' indicates

• Breaking

• Sedimentation

• Creaming

• Flocculation

Above is one of test done to determine Types of Emulsion. What is the name of the test?

• Cobalt suphate test

• Cobalt chloride test

• Cobalt oxide test

• cobalt blue test