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what is hardy schulze rule ?
If FeCl3 is added to excess of hot water, a postively charged sol of hydrated ferric oxide is formed due to adsorption of Fe3+ ions. However, when ferric chloride is added to NaOH, a negatively charged sol is obtained with adsorption of OH- ions. Why is there such a difference? Explain in detail.
what is dispersed phase and dispersed medium
Why is gelatine is added to ice-creams?
explain tyndall effect more deeply
Give an example of protective colloid.
what is magneson reagent, what is its chemical formula and name ?
Lyophilic sols are more stable den lyophobic sols. Why???
what is the difference between partial hydrolysis and complete hydrolysis?
what happens when glucose is treated with bromine water ??
explain :same substance can act both as colloids and crystalloids.(1 mark) ..... i've already seen the existing ans but not satisfied.
which of the following electrolytes is most effective for the coagulation of Fe(OH)3 sol and why?
Q3. Differentiate between peptization and coagulation.
what is Bredig's Arc method?
peptizing agent is added to convert ppt into colloidal solution. give reason?
difference between physisorption and chemisorption
which of the following is most effective in coagulation of As2S3 sol?
Na3PO4, MgCl2, CaCl2, AlCl3
50 ml of standard gold solution needs 0.05 mg of gelatin for its protection from coagulation . Calculate gold number of gelatin.
what is haber's process????????
What is shape selective
the vapour pressure of pure benzene at 25*c is 639.7 mm of Hg and vapour pressure of solute in benzene at the same temprature is 631.9 mm of Hg. calculate the molality
Distinguish between Freundlich adsorption isotherm and Langmuir adsorption isotherm also by plotting graphs?
I can't understand that when AgNO3 Is added to KI solution ,ppt. adsorbes I- ions leading to the formation of negatively charged colloidal solution ,but when KI is added to same AgNO3 solution ,then adsorption of Ag+ ion takes place ,why not I- get adsorbed in this case also?Kindly explain
Coagulation takes place when sodium chloride solution is added to a colloidal solution of ferric
which get adsorbed easily on charcoal?(NH3 or CO2)
Explain what is
(i) When a beam
of light is passed through a colloidal sol.
electrolyte, NaCl is added to hydrated ferric oxide sol.
current is passed through a colloidal sol?
explain the relation between conductivity and molar conductivity of a solution?
difference between inhibitors and promoters...
How adsorption is an exothermic reaction..???
formula for calculating the gold no. for a lyophilic sol?
what causes brownian movement in a colloidal solution?
More easily liquefiable gases are adsorbed readily.
Please explain the reason for the above phenomenon.
which of the following is most effective electrolyte in the coagulation of AgI/ Ag+sol?
K2SO4 , MgCl , K4[Fe(CN)6] .
what is observed when an emulsion is subjected high speed centrifugation?
For hydrogenation, catalytic activity increases from Group 5-11. It's also mentioned that the activity is maximum for groups 7-9. So, Is the activity higher in group 11 or in group 9?
what is the composition of copper matte?
Why does physisorption decrease with increase in temperature?
examples of lyophilic lyophobic sols
GIVE REASONS FOR THE FOLLOWING
A) colloids stabilize due to brownian movement.
B) cottrell's smoke precipitator is fitted at the mouth of chimney used in factories.
C) colloidal gold is used for intramuscular injection
What is collodion???
why hydrophobic sols are easily coagulated?
What are the factors which influence the adsorption of a gas on a solid?
There are various factors that affect the rate of adsorption of a gas on a solid surface.
(1) Nature of the gas:
Easily liquefiable gases such as NH3, HCl etc. are adsorbed to a great extent in comparison to gases such as H2, O2etc. This is because Van der Waals forces are stronger in easily liquefiable gases.
(2) Surface area of the solid
The greater the surface area of the adsorbent, the greater is the adsorption of a gas on the solid surface.
(3) Effect of pressure
Adsorption is a reversible process and is accompanied by a decrease in pressure. Therefore, adsorption increases with an increase in pressure.
How does adsorption increase with an increase in pressure? The previous sentence is contrasting.
is it necessary to remove CO when ammonia is obtained by Haber’s
Comment on the statement colloid is not a substance but only state of substance.
What is the difference between double displacement and double decomposition reactions? Or are they the same?
wht is preferential adsorption of colloidal sol?explain
What is an adsorption
isotherm? Describe Freundlich adsorption isotherm.
WHY LYOPHILIC COLLOIDS ARE REVERSIBLE AND LYOPHOBIC ARE IRREVERSIBLE ?PLZ XPLAIN WITH EX./?
what is flocculating ion
what is platinised asbestos???????????????
what do we mean by activity n desorption??????????????/// pls help............
adsortion ,absorption,sorption is exothermic or endothermic.........n explain y is it ?
which enzyme convert starch into maltose?
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