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
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
How many structural isomers are possible for C4H9Cl ?
2
4
8
10
B.
4
The possible structural isomers of C4H9Cl are :
(i) CH3-CH2-CH2-CH2-Cl
1 - chloro butane
(ii) CH3-CH2--CH3
2 - chloro butane
(iii) CH3--CH2-Cl
1 - chloro - 2 - methyl propane
(iv)
2 - chloro - 2 - methyl proane
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