The hydrogen electrode is dipped in a solution of pH = 3 at 25°C .The potential of the cell would be ,
(the value of 2.303 RT/F is 0.059 V)
0.177 V
0.087 V
-0.177 V
0.059 V
Which of the following solutions will have the highest boiling point ?
0.1 M FeCl3
0.1 M BaCl2
0.1 M NaCl
0.1 M urea
The activation energy for most of the reactions is approximately 50 kJ mol-1 .The value of temperature coefficient for such reactions is :
> 2
> 3
< 1
> 4
Phosgene is the common name of the following compound :
Mixture of CO2 and Cl2
POCl3
Carbonyl chloride
Carbon tetrachloride
Which belongs to the actinide series ?
Ce
Cf
Ca
Cs
B.
Cf
The fourteen elements which follow actinium from thorium (Z = 90) to lawrencium (Z = 103) are called actinoids .They involve the filling of 5f -subshell .Californium (Cf) has the atomic number 98 and its configuration is as
Cf (Z =98) : [Rn]5f10 , 6d0 , 7s2
Hence , it is a member of actinide series .
For a first order reaction at 27°C , the ratio of time required for 75% completion to 25% completion of reaction is :
log
log
If the rate of reaction , A B doubles on increasing the concentration of A by 4 times , the order of the reaction is :
2
1
0.5
4
The group of elements in which the differentiating electrons enters in the antepenultimate shell of atoms are called :
f - block elements
p - block elements
s - block elements
d - block elements