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Recent questions tagged unit5

At which point of lyophilic colloids , they are expected to have minimum stability ?

asked Mar 20, 2014 by yamini.v

1 answer

Which of the following statements states the terms ' activity ' and ' selectivity ' respectively ?

asked Mar 20, 2014 by yamini.v

1 answer

Which of the following is the general formula of zeolites ?

asked Mar 20, 2014 by yamini.v

1 answer

Among the following colloidal solo . Which one is given to a person having poisoning ?

asked Mar 20, 2014 by yamini.v

1 answer

Which of the following is another name for gold number ?

asked Mar 20, 2014 by yamini.v

1 answer

Which of the following is a positively charged sol ?

asked Mar 20, 2014 by yamini.v

1 answer

What are the type of solution in the two tumblers below respectively ?

asked Mar 19, 2014 by yamini.v

1 answer

Which set of colloidal solutions can be obtained by electrical dispersion / Bredig's are method ?

asked Mar 19, 2014 by yamini.v

1 answer

By which of the following methods . Gold sol is prepared ?

asked Mar 19, 2014 by yamini.v

1 answer

Which type of solution stated below shows the following properities ? $\;$(1) Homogeneous in nature $\;$ (2) It cant be separated by ultra filtration $\;$ (3) The appearance is transparent .

asked Mar 19, 2014 by yamini.v

1 answer

What will happen when $\;NH_{3}\;$ and $\;CO_{2}\;$ is placed on the surface of charcoal separately ?

asked Mar 19, 2014 by yamini.v

1 answer

100 mL of a colloidal solution is completely precipitated by addition of 5 mL of 1 M NaCl solution . Calculate the coagulation value of NaCl .

asked Mar 19, 2014 by yamini.v

1 answer

What is obtained when a freshly precipitated $\;Fe(OH)_{3}\;$ is shaken with title amount of dilute solution of $\;Fecl_{3}\;$ ?

asked Mar 19, 2014 by yamini.v

1 answer

The coagulation of 100 ml of a colloidal solution of gold is completely prevented by the addition of 0.25 g of starch to it before adding 1 ml of 10% Nacl solution . Calculate the gold number of starch .

asked Mar 19, 2014 by yamini.v

1 answer

Which of the following protective colloids has the maximum gold number ?

asked Mar 19, 2014 by yamini.v

1 answer

In a coagulation experiment $5 \;mL$ of $\;As_{2}S_{3}\;$ is mixed with disfilled water and $0.1\; M$ solution of an electorlyte $AB$ so that total volume is $10\; mL$ . It was found that all solutions containing more than $4.6\; mL$ of $AB$ coagulate with in $5$ minutes . What is the flocculation value of $AB$ for $\;As_{2}S_{3}\;$ sol ?

asked Mar 19, 2014 by yamini.v

1 answer

Which of the following set is a colloid of solid -Gas i. e. Aerosol .

asked Mar 19, 2014 by yamini.v

1 answer

Which of the following terms are also called as chemisorption ?

asked Mar 19, 2014 by yamini.v

1 answer

In the stoichiometry of natural faujasite -a zeolite with formula $\;Na_{x}[(Alo_{2})_{56}(Sio_{2})_{136}].2SOH_{2}O\;$ the value of x is

asked Mar 19, 2014 by yamini.v

1 answer

Which of the following are correct pertaining to the adsorption of a gas can a solid surface ?

asked Mar 19, 2014 by yamini.v

1 answer

At the lowest molar concentration at ambient conditions which among the following surfactant will form micelles in aqueous solution ?

asked Mar 19, 2014 by yamini.v

1 answer

Adsorption is generally an

asked Mar 19, 2014 by yamini.v

1 answer

At isoelectric point the colloidal particles

asked Mar 19, 2014 by yamini.v

1 answer

Plot of $\;log\; \large\frac{x}{m}\;$ against $\;log\; P$ is a straight line inclined at an angle of $\;45^{0}\;$ . When the pressure is 0.5 atm and Freundlich parameter , $K$ is $10.6$ , the amount of the solute adsorbed per gram of adsorbed will be $\;(log\; 5 = 0.0990)\;$

asked Mar 19, 2014 by yamini.v

1 answer

Adsorption is accompanied by

asked Mar 19, 2014 by yamini.v

1 answer

$10^{-4}\;g$ of gelatin is required to be added to $\;100\;cm^{3}$ of a standard gold sol to just prevent its coagulation by the addition of $\;1\;cm^{3}$ of $\;10\%\;$ NaCl solution to it . Hence , the gold number of gelatin is

asked Mar 19, 2014 by yamini.v

1 answer

The colour of a colloidal solution depends upon

asked Mar 18, 2014 by yamini.v

1 answer

A colloidal solution of gold in water is

asked Mar 18, 2014 by yamini.v

1 answer

The average particle mass in colloidal solutions can be determined by

asked Mar 18, 2014 by yamini.v

1 answer

The CMC of a given soap in water is $\;10^{-3}\;molL^{-1}\;.$ A $\;10^{-4}\;molL^{-1}\;$ solution of this soap in water is a

asked Mar 18, 2014 by yamini.v

1 answer

Gold numbers of protective colloids A ,B ,C and D are 0.50 , 0.01 , 0,05 and 0.005 respectively , the correct order of their protective powers is

asked Mar 18, 2014 by yamini.v

1 answer

Langmuir adsorption isotherm is deduced using the assumption

asked Mar 18, 2014 by yamini.v

1 answer

The reactions given below , are the catalyst and corresponding process / reaction are matched , the mismatch is

asked Mar 18, 2014 by yamini.v

1 answer

A plot of x/m versus log p for the adsorption of a gas on a solid gives a straight line with slope equal to

asked Mar 18, 2014 by yamini.v

1 answer

Which of the following reactions shows the formation of positively / negatively charged sol correctly?

asked Mar 18, 2014 by mosymeow_1

1 answer

The number of moles of lead nitrate needed to coagulate a mol of colloidal $\;[AgI]I^{-}\;$ is

asked Mar 18, 2014 by yamini.v

1 answer

Which among the following statements are connect with respect to adsorption of gases on a solid ?$\; \;$ (1) The extent of adsorption is equal to $\;kp^{n}\;$ according to freundlich isotherm.$\;\;$ (2) The extent of adsorption is equal to $\;kp^{\large\frac{1}{n}}\;$ according to freundlich isotherm . $\;\;$ (3) The extent of adsorption is equal to $\;\large\frac{(a+bp)}{ap}\;$ according to freundlich isotherm . $\;\;$ (4) The extent of adsorption is equal to $\;\large\frac{ap}{(1+bp)}\;$ according to freundlich isotherm . $\;\quad\;$ (5) Freundlich adsorption fails at a low pressure .

asked Mar 18, 2014 by yamini.v

1 answer

Which of the following diagram shows the situation of the $As_2S_3$ particles after electrophoresis?

asked Mar 18, 2014 by mosymeow_1

1 answer

The coagulation of 200 mL of a positive colloid took place . When 0.73 g Hcl was added to it without changing the volume much . The flocculation value of Hcl for the colloid is

asked Mar 18, 2014 by yamini.v

1 answer

What is the equation form of Langmuir isotherm under high pressure ?

asked Mar 18, 2014 by yamini.v

1 answer

Which of the following is used to produce smoke screens ?

asked Mar 18, 2014 by yamini.v

1 answer

Which one of the following forms micelles in aqueous above certain concentration .

asked Mar 18, 2014 by yamini.v

1 answer

Which of the following explains the process of de-emulsification?

asked Mar 18, 2014 by mosymeow_1

1 answer

Which among the following is a non-elastic gel?

asked Mar 18, 2014 by mosymeow_1

1 answer

Which of the following below is used as an eye lotion?

asked Mar 18, 2014 by mosymeow_1

1 answer

Fertile soils are also colloidal in nature. Which of the following acts as a protective colloid in soil?

asked Mar 18, 2014 by mosymeow_1

1 answer

The volume of a couridal particle , $\;V_{c}\;$ as compared to the volume of a solute particle , $\;V_{s}\;$ in a true solution could be

asked Mar 18, 2014 by yamini.v

1 answer

In Zeigler-Natta polymerization of ethylene the active spices is

asked Mar 18, 2014 by yamini.v

1 answer

Milk can be preserved by adding a few drops of

asked Mar 18, 2014 by yamini.v

1 answer

Which of the following states the reason behind the formation of 'Tail of Comets' phenomenon in a colloidal solution?

asked Mar 17, 2014 by mosymeow_1

2 answers

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