CBSE
Ammonia is a Lewis base and it forms complexes with many cations. Which one of the following cations does not form a complex with ammonia?
Ag+
Cu2+
Cd2+
Pb2+
At equilibrium, the rate of dissolution of a solid solute in a volatile liquid solvent is
less than the rate of crystallisation
greater than the rate of crystallisation
equal to the rate of crytallisation
zero
for the rreaction,
Ag2O(s) 2Ag(s) + O2 (g) are 30.56 kJ mol-1 and 66.00 JK-1 mol-1 respectively. The temperature at which the free energy change for the reaction will be zero is
3528 K
463 K
73 K
144 K
pKa of acetic acid and pKb of ammonium hydroxide are 4.76 and 4.75 respectively. Calculate the pH of ammonium acetate solution.
6.02
7.005
8
5.602
R - CH2 - CH2 - OH can be converted into RCH2CH2COOH by the following sequence of steps.
PBr3, KCN, H2 /Pt
PBr3, KCN, H3O+
HCN, PBr3, H3O+
KCN, H3O+
Ig Ag+ + 2NH3 Ag (NH3 ; K1 = 1.7 x 107
Ag+ + Cl- AgCl; K2 = 5.4 x 109
Then, for AgCl + 2NH3 [Ag(NH3)2]+ + Cl- equilibrium constant will be
0.68 x 10-3
5.2 x 10-17
0.31 x 10-2
3.1 x 10-2
For the homogeneous reaction,
4NH3 + 5O2 4NO + 6H2O
the equilibrium constant Kc has the units
conc.+10
conc.+1
conc.-1
it is dimensionless
What percentage of -D-(+-glucopyranose is found at equilibrium in the aqueous solution?
64%
36%
100%
50%
For the following equilibrium (omitting charges)
I. M + Cl MCl, Keq = 1
II. MCl + Cl MCl2, Keq = 2
III. MCl2 +Cl MCl3 ,Keq = 3
IV. M + 3Cl MCl3 , Keq = K
then relationship between K,
K =
All of the above
The value of Kc for the reaction,
2A B + C is 2 x 10-3. At a given time, if the composition of reaction mixture is [A] = [B] = [C] = 3 x 10-3 M. Which is true?
The reaction will proceed in forward direction
The reaction will proceed in backward direction
The reaction will proceed in any direction
None of the above