A bottle of cold drink contains 200 ml liquid in which CO2 is 0.1 molar .Suppose CO2 behaves like an ideal gas , the volume of the dissolved CO2 at STP is :
0.224 L
22.4 L
0.448 L
44.8 L
If a salt bridge is removed between the half cells , the voltage :
decreases to zero
increases
increases rapidly
do not change
A.
decreases to zero
In absence of salt bridge excess positive charge accumulates at anode solution and excess negative charge accumulates at cathode solution which stop working ie , voltage decreases to zero .
Lanthanum the first element of lanthanide series has :
only unfilled 3d orbitals
unfilled 3d and 4d orbitals
unfilled 4d and 4forbitals
unfilled 4f and 5d orbitals
A radioactive substance decays th of it original value in 2h. The half-life of the substance is :
1 h
30 min
20 min
15 min
The chemical reaction 2O3 3O2 proceeds as :
(I) O3 O2 + O (fast)
(II) O + O3 2O2 (slow)
The rate expression should be :
r = k[O3]2
r = k[O3]2 [O2]-1
r = k[O3] [O2]
None of these
0.5 molal solution of ethylene glycol in water is used as coolant in car .If the freezing point depression constant ofwater is l.86°C per mol , the mixture will freeze at :
0.93 °C
- 0.93 °C
1.86 °C
- 1.86 °C