The temperature of the system decreases in an :
adiabatic compression
isothermal compression
isothermal expansion
adiabatic expansion
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°
C.
0°
In the eclipsed conformation of ethane, each of the hydrogen atom on the back carbon lies exactly behind each of the hydrogen atoms on the front carbon and the dihedral angle between the two is 0°.