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what is hardy schulze rule ?
what is dispersed phase and dispersed medium
explain tyndall effect more deeply
which of the following electrolytes is most effective for the coagulation of Fe(OH)3 sol and why?
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???
Coagulation takes place when sodium chloride solution is added to a colloidal solution of ferric
what happens when glucose is treated with bromine water ??
Q3. Differentiate between peptization and coagulation.
The charge on the sol particles is due to one or more reasons, viz., due to electron capture by sol particles during electrodispersion of metals, due to preferential adsorption of ions from solutions and/or due to formulation of electrical double layer. Please explain me the meaning of the 'bold' lines.
what is Bredig's Arc method?
Adsorption is accompanied by : also explain
decrease in enthalpy of the system
increase in entropy of the system
increase in free energy of the system
increase in both enthalpy and entropy
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????????
What is shape selective
which of the following is most effective electrolyte in the coagulation of AgI/ Ag+sol?
K2SO4 , MgCl , K4[Fe(CN)6] .
Distinguish between Freundlich adsorption isotherm and Langmuir adsorption isotherm also by plotting graphs?
A lump of coal burns at a moderate rate in air while coal dust burns explosively.why?
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
why physisorption results into multi-molecular layer and chemisorption results into uni molecular layer???????????
which get adsorbed easily on charcoal?(NH3 or CO2)
What is the difference between catalytic poison and negative catalyst?please tell me as early as u can?
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?
why is low temperature favourable for physisorption?
what is platinised asbestos???????????????
what do we mean by activity n desorption??????????????/// pls help............
difference between inhibitors and promoters...
what is the cause of adsorption??
explain the relation between conductivity and molar conductivity of a solution?
what is residual force?
How adsorption is an exothermic reaction..???
what is the difference between partial hydrolysis and complete hydrolysis?
what causes brownian movement in a colloidal solution?
More easily liquefiable gases are adsorbed readily.
Please explain the reason for the above phenomenon.
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.
1. state the principle of eletrodialysis.
2. why is water not alone sufficient for removing dirt from cloth??
3. Name two demulsifiers.
4. give one example of each of "oil in water" & "water in oil" emulsions.
Why is gelatine is added to ice-creams?
in chemisorption , why x/m increases and then decreases with rise in temperature ?
what is observed when an emulsion is subjected high speed centrifugation?
What is bulk phase?
what is the composition of copper matte?
Give an example of protective colloid.
Why does physisorption decrease with increase in temperature?
Explain the formation of delta.
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
explain :same substance can act both as colloids and crystalloids.(1 mark) ..... i've already seen the existing ans but not satisfied.
Why is it generally preferable to use absorbance as a measure of absorption rather than % Transmittance?
Because %T is dependant on the power of the incident radiation
Because absorbance is proportional to the concentration of the analyte, whereas %T is not.
Because %T cannot be measured as accurately as absorbance
None of these are correct
examples of lyophilic lyophobic sols
why hydrophobic sols are easily coagulated?
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.
wht is preferential adsorption of colloidal sol?explain
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 difference between double displacement and double decomposition reactions? Or are they the same?
difference between activators, inhibitors, promoters and co-enzymes.
Lyophilic sols are called protected colloids. How???
What is an adsorption
isotherm? Describe Freundlich adsorption isotherm.
what is flocculating ion
adsortion ,absorption,sorption is exothermic or endothermic.........n explain y is it ?
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