The Ka of an acid is 3.2 x 10-5. The degree of dissociation of the acid at concentration of 0.2 M is
6.0 x 10-2
1.26 x 10-2
4.0 x 10-2
0.04 x 10-3
Which of the following statement is not correct?
Adsorption energy for chemical adsorption is generally greater than that of physical adsorption
Physical adsorption is due to van der Waal forces
Physical adsorption decreases at high temperature and low pressure
Physical adsorption is irreversible
For a reaction, the half-life is independent of initial concentration. What is the order of that reaction?
Zero
One
Two
Three
Addition of a non-volatile solute causes lowering in vapour pressure of a solvent from 0.8 atm to 0.2 atm. What is the
mole fraction of solvent?
0.25
0.75
0.50
Cannot be predicted
Two metals 'A' and 'B' have E, value equal to 0.36 V and 1.23 V. What will be the correct cell equation?
A + B2+ A2+ + B
A2+ + B A + B2+
Both (a) and (b)
None of the above
Which of the following, is a mordant dye?
Aniline black
Congo-red
Alizarin
Indigo
C.
Alizarin
Mordant dyes are those dyes, which cannot be fixed directly on fabric but require some fixating agents (like Cr
salts) e.g., Alizarin.
The compound which reacts faster with Lucas reagent is
butan-1-ol
butan-2-ol
2-methyl-propan-1-ol
2-methyl propan-2-ol