Match List - I with List - II . List- I (Colloid Preparation Method) List- II (Chemical Reaction) ( a ) Hydrolysis ( i ) 2 AuCl 3 + 3 HCHO + 3 H 2 O → 2 Au ( sol ) + 3 HCOOH + 6 HCl ( b ) Reduction ( ii ) As 2 O 3 + 3 H 2 S → As 2 S 3 ( sol ) + 3 H 2 O ( c ) Oxidation ( iii ) SO 2 + 2 H 2 S → 3 S ( sol ) + 2 H 2 O ( d ) Double Decomposition ( iv ) FeCl 3 + 3 H 2 O → Fe ( OH ) 3 ( sol ) + 3 HCl Choose the most appropriate answer from the options given below :

( a ) - ( iv ) , ( b ) - ( i ) , ( c ) - ( iii ) , ( d ) - ( ii )

( a ) - ( i ) , ( b ) - ( iii ) , ( c ) - ( ii ) , ( d ) - ( iv )

( a ) - ( i ) , ( b ) - ( ii ) , ( c ) - ( iv ) , ( d ) - ( iii )

( a ) - ( iv ) , ( b ) - ( ii ) , ( c ) - ( iii ) , ( d ) - ( i )

Process of converting precipitate into colloidal solution

Process of converting a colloidal solution into precipitate

Process of converting soluble particles to form colloidal solution

Process of bringing colloidal molecule into solution

EASY

Earn 100

On adding few drops of dil. HCl to freshly precipitated ferric hydroxide, a red coloured colloidal solution is obtained. This phenomenon is known as

43.75% studentsanswered this correctly

EASY

For coagulation of arsenious sulphide sol, which of the following salt solutions will be most effective?

MEDIUM

Which method is used to prepare colloids?

${As}_{2} O_{3} + 3 H_{2} S \to {As}_{2} S_{3} (sol) + 3 H_{2} O$

EASY

Fog is a colloidal solution of:

EASY

When a sulphur sol is evaporated sulphur is obtained. On mixing with water sulphur sol is not formed. The sol is

EASY

Using Bredig's arc method, which of the following metallic sols cannot be prepared _______

EASY

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of

A s_{2} S_{3}

are given below,

I .

(N a C l) = 52

II .

(B a C l_{2}) = 0.69

III .

(M g S O_{4}) = 0.22

The correct order of their coagulating power is

MEDIUM

25 mL

of silver nitrate solution

(1 M)

is added dropwise to

25 mL

of potassium iodide

(1.05 M)

solution. The ion(s) present in very small quantity in the solution is/are

MEDIUM

As per Hardy-Schulze formulation, the flocculation values of the following for ferric hydroxide sol are in the order:

EASY

Match List - $I$ with List - $II .$

List- $I$ (Colloid Preparation Method)		List- $II$ (Chemical Reaction)
$(a)$	Hydrolysis	$(i)$	$2 {AuCl}_{3} + 3 HCHO + 3 H_{2} O \to 2 Au (sol) + 3 HCOOH + 6 HCl$
$(b)$	Reduction	$(ii)$	${As}_{2} O_{3} + 3 H_{2} S \to {As}_{2} S_{3} (sol) + 3 H_{2} O$
$(c)$	Oxidation	$(iii)$	${SO}_{2} + 2 H_{2} S \to 3 S (sol) + 2 H_{2} O$
$(d)$	Double Decomposition	$(iv)$	${FeCl}_{3} + 3 H_{2} O \to Fe (OH)_{3} (sol) + 3 HCl$