Match the following: List- I List- II Type of Colloid Phase in medium ( A ) Aerosol ( I ) Solid in solid ( B ) Emulsion ( II ) Liquid in solid ( C ) Foam ( III ) Gas in liquid ( D ) Gel ( IV ) Solid in gas ( V ) Liquid in liquid The correct answer is

A = IV , B = V , C = III , D = II

A = I , B = II , C = III , D = IV

A = IV , B = V , C = II , D = III

A = II , B = V , C = I , D = IV

Collodion is a flammable, syrupy solution of nitrocellulose in ether and alcohol. There are two basic types: flexible and non-flexible. The flexible type is often used as a surgical dressing or to hold dressings in place. When painted on the skin, collodion dries to form a flexible nitrocellulose film. While it is initially colourless, it discolours over time. Non-flexible collodion is often used in theatrical make-up.

Associated colloids (Micelles): There are some substances that at low concentrations behave as normal strong electrolytes, but at higher concentrations exhibit colloidal behaviour due to the formation of aggregates. The aggregated particles thus formed are called micelles. These are also known as associated colloids. The formation of these micelles takes place only above a particular temperature called Kraft temperature and above a particular concentration is called critical micelle concentration (CMC).

MEDIUM

Earn 100

What is Gel? Discuss the types of gels.

Important Questions on Surface Chemistry

EASY

Chemistry>Physical Chemistry>Surface Chemistry>Classification of Colloids

Curd belongs to the type of colloid

MEDIUM

Chemistry>Physical Chemistry>Surface Chemistry>Classification of Colloids

The mass of Haemoglobin in

mg

required to protect from coagulation of

50 mL

of a gold sol on adding

5 mL

10 % NaCl

solution is: (gold number of Haemoglobin

= 0.03

)

EASY

Chemistry>Physical Chemistry>Surface Chemistry>Classification of Colloids

Gold sol is not a

MEDIUM

Chemistry>Physical Chemistry>Surface Chemistry>Classification of Colloids

Give reasons for the following statement:

Lyophilic sols are called reversible colloids.

EASY

Chemistry>Physical Chemistry>Surface Chemistry>Classification of Colloids

The aerosol is a kind of colloid in which

EASY

Chemistry>Physical Chemistry>Surface Chemistry>Classification of Colloids

Sulphur sol is an example of

EASY

Chemistry>Physical Chemistry>Surface Chemistry>Classification of Colloids

Match the following:

	List- $I$		List- $II$
	Type of Colloid		Phase in medium
( $A$ )	Aerosol	( $I$ )	Solid in solid
( $B$ )	Emulsion	( $II$ )	Liquid in solid
( $C$ )	Foam	( $III$ )	Gas in liquid
( $D$ )	Gel	( $IV$ )	Solid in gas
		( $V$ )	Liquid in liquid

The correct answer is

EASY

Chemistry>Physical Chemistry>Surface Chemistry>Classification of Colloids

What is collodion?

MEDIUM

Chemistry>Physical Chemistry>Surface Chemistry>Classification of Colloids

Molar conductivity

(⋀_{m})

of aqueous solution of sodium stearate, which behaves as a strong electrolyte, is recorded at varying concentration(c) of sodium stearate. Which one of the following plots provides the correct representation of micelle formation in the solution?

(Critical micelle concentration (CMC) is marked with an arrow in the figures.)

EASY

Chemistry>Physical Chemistry>Surface Chemistry>Classification of Colloids

Critical Micelle concentration for a soap solution is