Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction?
Endothermic and decreasing disorder
Exothermic and increasing disorder
Endothermic and increasing disorder
Exothermic and decreasing disorder
Identify the correct statement for change of Gibbs energy for a system (Gsystem) at constant temperature and pressure
If Gsystem = 0, the system has attained equilibrium
If Gsystem = 0, the system is still moving in a particular direction
If Gsystem = 0, the process is not spontaneous
If Gsystem = 0, the process is spontaneous
The standard emf of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25°C. The equilibrium constant of the reaction would be
2.0 × 1011
4.0 × 1012
1.0 × 102
1.0 × 1010
nXm emit one α and two β- particles. It is converted into
nXm - 4
n - 1Xm - 1
nZm - 4
None of these
A.
nXm - 4
If an α-particle emits from radioactive element its atomic number decreases by 2 unit and mass number decreases by 4 unit. If one β-particle emits from radioactive element its atomic number increases by 1 unit and mass number remains same.
nXm n - 2Xm - 4 nXm - 4
A compound has the empirical formula CH2O. Its vapour density is 30. Its molecular formula is
C2H4O2
C2H6O
C2H6O2
C2H4O