Order Chlorine and Hydrogen Assignment

Order Chlorine and Hydrogen Assignment
51. A current of 0.10 amp was passed for two hours through a solution of cupra cyanide 0.3745 g of copper was deposited
at the cathode. Calculate the volume of hydrogen measured at STP liberated simultaneously. (At wt of Cu = 63.6)
(a) 14.46 ml (b) 17.64 ml (c) 16.47 ml (d) 15.22 ml
52. Given (i) Co3 e Co2 ; Eq = 1.82 volt; (ii) Cu e Cu; Eq = 0.52 volt (iii) Cu2 e Cu ; Eq =
0.15 volt (iv) 2H2
O O2(g) 4H 4e–; ; Eq = 1.23
V
. Indicate the correct stateent among the following:
(a) Both Co3 and Cu ions are unstable in aqueous solution.
(b) Both Co3 and Cu ions are stable in aqueous solution.
(c) Co3 ion (but not Cu ion) is stable in aqueous solution.
(d) Cu ion (but not Co3 ion) is stable in aqueous solution.
53. Given ½Br2
e Br-
; Eq = 1.09 V; ½ ,
2(s) e I-
; Eq = 0.535 V.
Fe3 e Fe2 ; Eq = 0.771 volt. Indicate the correct statement among the following.
(a) Fe3 ion will oxidize both Br-
and Iions (for unit activity)
(b) Fe3 ion will not oxidize either of the two ions.
(c) Fe3 ion will oxidize Br-
ion but not Iion.
(d) Fe3 ion will oxidize I-
ion but not Br-
ion.
54. Consider the cell H2
(Pt) (1 atm)/ x M
H ion // 2
0.1M
Cu
/Cu. Given that Eq (Cu2 , Cu) = 0.34 volt and x = 106
Order Chlorine and Hydrogen Assignment
M. The measured
emf of the cell, at 298 K is
(a) 0.586 volt (b) 0.562 volt
(c) 0.665 volt (d) 0.856 volt
55. The following data are for š of HCl in :-1 cm2
mol-1 at two different concentrations at 298 K. Calculate š0
. (i) š1
=
422.74 :-1 cm2
mol-1 at C = 5 u 10-4
mol L-1 (ii) š2= 421.36 :-1 cm2
mol1
at C = 1 u 103
mol L1
(a) 436.2 (b) 426.1 (c) 429.2 (d) 430.2
56. Concentration of solution in moles per litre is used in osmotic pressure calculation because
(a) the magnitude of osmotic pressure is large.
(b) measurement of osmotic pressure is done at constant temperature.
(c) osmosis involve decrease in concentration as the process takes place.
(d) it is not considered as a colligative property.
57. At 40qC, the total vapour pressure of a mixture of two liquids A and B is P (torr) = 119 x 135 (x = mole fraction in
the liquid phase) of liquid, A. Assume ideal behavior. What are the vapour pressures of the pure liquids. Calculate the
mole fraction of A in the vapour for x = 0.5.
(a) 0.653 (b) 0.563 (c) 0.536 (d) 0.702