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what is hardy schulze rule ?
what is dispersed phase and dispersed medium
explain tyndall effect more deeply
what is magneson reagent, what is its chemical formula and name ?
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.
Lyophilic sols are more stable den lyophobic sols. Why???
1 gm of charcoal adsorbs 100 ml 0.5 M CH3COOH to form a monolayer thereby the molarity of CH3COOH reduces to 0.49. Calculate the surface area of the charcoal adsorbed by each molecule of acetic acid. Surface area of charcoal= 3.01x 102 m2/gm.
what happens when glucose is treated with bromine water ??
Give an example of protective colloid.
Q3. Differentiate between peptization and coagulation.
On addition of 1 ml solution of 10% NaCl to 10 ml of gold sol in the presence of 0.025g of starch the coagulation is just prevented. The gold number of starch is (A) 0.025 (B) 0.25 (C) 2.5 (D) 25
which of the following electrolytes is most effective for the coagulation of Fe(OH)3 sol and why?
what is Bredig's Arc method?
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
difference between physisorption and chemisorption
which of the following is most effective in coagulation of As2S3 sol?
Na3PO4, MgCl2, CaCl2, AlCl3
what is haber's process????????
is it essential to wash the precipitate with water before estimating
What is shape selective
Distinguish between Freundlich adsorption isotherm and Langmuir adsorption isotherm also by plotting graphs?
why physisorption results into multi-molecular layer and chemisorption results into uni molecular layer???????????
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?
Comment on the statement colloid is not a substance but only state of substance.
Why is gelatine is added to ice-creams?
explain the relation between conductivity and molar conductivity of a solution?
difference between inhibitors and promoters...
How adsorption is an exothermic reaction..???
which of the following is most effective electrolyte in the coagulation of AgI/ Ag+sol?
K2SO4 , MgCl , K4[Fe(CN)6] .
what causes brownian movement in a colloidal solution?
More easily liquefiable gases are adsorbed readily.
Please explain the reason for the above phenomenon.
what is residual force?
what is observed when an emulsion is subjected high speed centrifugation?
Explain what is observed when a colloidal solution of arsenious sulphide is treated as follows. i) An electrolyte is added to it. ii) A beam of light is passed through it. iii) It is brought under influence of electric field. PS:I want the answer asap ...please
what is the composition of copper matte?
what is the difference between partial hydrolysis and complete hydrolysis?
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.
Why does physisorption decrease with increase in temperature?
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
examples of lyophilic lyophobic sols
how adsorption process is spontaneous in nature?
Coagulation takes place when sodium chloride solution is added to a colloidal solution of ferric
why hydrophobic sols are easily coagulated?
in which of the following adsorption takesplace and why?
(i) silica gel placed in the atmosphere saturatated with water
(ii)anhydrous CaCl2 placed in the atmosphere saturated with water
is it necessary to remove CO when ammonia is obtained by Haber’s
explain :same substance can act both as colloids and crystalloids.(1 mark) ..... i've already seen the existing ans but not satisfied.
What is the difference
between multimolecular and macromolecular colloids? Give one example
of each. How are associated colloids different from these two types
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.
What do you mean by
activity and selectivity of catalysts?
adsortion ,absorption,sorption is exothermic or endothermic.........n explain y is it ?
what is flocculating ion
What is enzyme?
which enzyme convert starch into maltose?
why does bleeding stop when alum is applied on a fresh wound?
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