22455.When a sulphur sol is evaporated sulphur is obtained. On mixing with water sulphur sol is not formed. The sol is
reversible
hydrophobic
hydrophilic
lyophilic
22456.For a linear plot of log(x/m) versus log p in a Freundlich adsorption isotherm, which of the following statements is correct? (k and n are constants)
1/n appears as the intercept
Only 1/n appears as the slope
log(1/n) appears as the intercept
Both k and 1/n appear in the slope term
22458.Which one of the following statement is incorrect about enzyme catalysis?
Enzymes are denaturated by ultraviolet rays and at high temperature
Enzymes are least reactive at optimum temperature
Enzymes are mostly proteinous in nature
Enzyme action is specific
22459.In Freundlich Adsorption isotherm, the value of 1/n is
1 in case of physical adsorption
1 in case of chemisorption
Between 0 and 1 in all cases
Between 2 and 4 in all cases
22460.Rate of physical adsorption increase with
increase in temperature
decrease in pressure
decrease in temperature
decrease in surface area
22461.The amount of electrolytes required to coagulate a given amount of Agl colloidal solution (–ve charge) will be in the order
NaNO3 > Al2(NO3)3 > Ba(NO3)2
Al2(NO3)3 > Ba(NO3)2 > NaNO3
Al2(NO3)3 > NaNO3 > Ba(NO3)2
NaNO3 > Ba(NO3)2 > Al2(NO3)3
22462.Gold Sol is not
a macro molecular colloid
a lyophobic colloid
a multimolecualr colloid
negatively charged colloid
22463.For Freundilich isotherm a graph of log x/m is plotted against log P. The slope of the line and its y–axis intercept, respectively corresponds to
1/n, k
log 1/n, k
1/n, log k
log 1/n, log k
22464.Activated charcoal is used to remove colouring matter from pure substances. It works by___________.
adsorption
oxidation
reduction
bleaching