When a graph is plotted between log x/m and log p, it is straight line With an angle 45° and intercept 0.3010 on y-axis. If initial pressure is 0.3 atm, what will be the amount of gas adsorbed per gm of adsorbent :
Which of the following statements about physical adsorption is not correct ?
Physical adsorption is a multilayer phenomenon
Following is the variation of physical adsorption with temperature:
Rate of physical adsorption gradually decreases with increase the temperature.
Finally divided catalyst has greater surface area and has greater catalytic activity then the compact solid. If a total surface area of 6291456 cm is required for adsorption of gaseous reaction in a catalysed reaction, then how many splits should be made of cube exactly 1 cm in length.
Which of the following is not characteristic of chemisorption?
Chemical adsorption is a mono layer phenomenon
A colloidal solution can be purified following the method of
Gold number of a lyophilic sol is such property that:
Lower is the value gold number; greater will be the protecting power
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 .
At CIVIC, the surfactant molecules :
Some type of gels like gelatin loose water slowly. The process is known as :
During the adsorption of Krypton on activated charcoal at low temperature
Correct answer is option A
During the adsorption of krypton on activated charcoal at low temperature.
ΔH<0 and ΔS<0.
Since adsorption is an exothermic process, the enthalpy change is negative. Heat is given out during the process.
The krypton gas adsorbed on activated charcoal is more ordered than unadsorbed krypton gas. Hence, the process occurs with a decrease in entropy.
In other words, the entropy change is negative for the process.
Size of colloidal particles may range from
Select correct statement (s) :
Gold number of haemoglobin is 0.03. Hence, 100 mL of gold sol will require haemoglobin so that gold is not coagulated by 10 mL of 10% NaCl solution:
0.03 = weight of Hb in mg × 10 / 100
Which one of the following statements is correct:
What can adsorb larger volume of hydrogen gas :
It is because of more surface area of colloidal Pd
Statement-1 : All colloidal dispersions give very low osmotic pressure and show very small freezing point depression or boiling pointelevation.
Statement-2 : Tydall effect is due to scattering of light from the surface of colloidal particles.
Statement-1 : The Brownian movement is due to the bombardment of collodial particles by the molecules of dispersion medium which are in the constant motion like molecules in a gas.
Statement-2 :Brownian movement provides a visible proof of the random kinetic motion of molecules in a liquid.
Statement-1: In the coagulation of negatively charged arsenic sulphide soil, the coagulating power decreases in the order, Al3+ > Ba2+ > Na+.
Statement-2 : Generally greater the valence of coagulating ion, the greater is its power of coagulation.
Statement-1 : Isoelectric point is pH at which colloidal can move towards either of electrode
Statement-2 : At isoelectric point, colloidal solution become electrically neutral