The temperature of the system decreases in an :
adiabatic compression
isothermal compression
isothermal expansion
adiabatic expansion
D.
adiabatic expansion
In adiabatic expansion, work is done by the system , so it will loss heat to the surrounding. Thus, temperature of the system decreases.
A certain reaction is at equilibrium at 82°C and the enthalpy change for this reaction is 21.3 kJ. The value of S(JK-1mol-1) for the reaction is :
55.0
60.0
68.5
120.0
If in the reaction N2O4 2NO2 , x is that part of N2O4 which dissociates, then the number of molecules at equilibrium will be :
1
3
(1 + X)
(1 + X)2
The ccrrect statement with regard to and is :
both and are equally stable
both and do not exist
is more stable than
is more stable than
A covalent molecule AB3 has pyramidal structure. The number of lone pair and bond pair of electrons in the molecule a respectively :
2 and 2
0 and 2
3 and 1
1 and 3
The correct order of ionisation energy of C, N, O, F is :
F < 0 < N < C
F < N < C < 0
C < N < 0 < F
C < 0 < N < F
For a reaction, A + 2B C, the amount of C formed by starting the reaction with 5 moles of A and 8 moles of B is :
5 mol
8 mol
16 mol
4 mol
In the eclipsed conformation of ethane, the dihedral angle between the hydrogen atoms of adjacent methyl groups is :
60°
120°
0°
180°