Q1)
Rate of Physisorbtion increases with
A) Decrease in Temperature
B) Inc in Temp
C) Dec in pressure
D) Dec in surface area
Q2
Lyophilic sols are
A) Irreversible sols
B) Prepared from inorganic compounds
C) coagulated by adding electrolytes
D) Self stabilizing
Q3)
20% of surface sites are occupied by N2 molecules. The density of surace site is 6.023x1014 cm-2. and the total surace area is 1000cm2.
The catalyst is heated to 300K while N2 completely desorbed into a pressure of 0.001 atm and volume of 2.46 cm3. Find the number active sites occupied by each N2 molecule.
11] increases with decrease in temperature as forces involved are wvander waal,s forces.
1Q.2 lyophilic sols are solvent seeking , they are reversible and stable hence the answer is D
1q.3
number of active sites per unit area = 6.023x1014 cm-2
surface area of the metal=100cm2
therefore number of active sites= 6.023x1014x1000=6.023x1017
number of active sites adsorbed by N2 molecules = 20/100x6.023x1017=1.2046x1017
nmber of N2 molecules = PVNav/RT = [0.001x2.46x10-3/0.0821x300] x 6.023x1023
= 6.015 x1016
therefor number of active sites adsorbed by each N2 molecule =1.2046x1017/6.015x1016≈2
answer=2
1Q.1 heat of absorption is low . Low temperature is favourable and increases with decrease in temperature, hence option A
21OH I NEVER SAW THIS [2] [17]
THNX SIR!!!!!!!! [1]
@sir : Oh k... so this is da level and knidof Questns v can expext on the 12th [12]