CBSE
For the reaction,
H2O(l) H2O(g)
at 373 K and 1 atm pressure
H = 0
E = 0
H = T
H = E
The energy released when 6 moles of octane is burnt in air will be [Given, ΔHf for CO2 (g). H2O(g) and C8H18 (l), respectively are -490, -240 and +160J/mol]
-37.4 kJ
-20 kJ
-6.2 kJ
-35.5 kJ
Which of the following is the increasing order of enthalpy of vaporization?
NH3, PH3, AsH3
AsH3, PH3 NH3
NH3, AsH3, PH3
PH3, AsH3, NH3
What is the H of the reaction?
CH2Cl2 (g) C (g) + 2H (g) + 2Cl (g)
The average bond energies of C-Cl bond and C-H bond are 416 kJ and 325 kJ mol-1 respectively.
1482 kJ
1482 J
1492 kJ
1492 J
According to the first law of thermodynamics which of the following quantities represents the change in a state function?
qrev
qrev - Wrev
qrev + Wrev
For the process to occur under adiabatic conditions, the correct condition is
T = 0
p = 0
q = 0
W = 0
O2(g) O3(g); Kp for this reaction is 2.47 x 10-29. At 298 K, for conversion of oxygen to ozone will be
100 kJ mol-1
150 kJ mol-1
163 kJ mol-1
2303 kJ mol-1
The heat of formation of CO(g) and CO2 (g)are H = -110 and H = - 393 kJ mol-1 respectively. What is the heat of reaction (H) (in kJ mol-1) for the following reaction?
CO (g) + (g) CO2(g)
-504
-142.5
-283
504
Graphite is a
molecular solid
covalent solid
ionic solid
metallic solid
If for a given substance, melting point is TB and freezing point is TA then correct variation of entropy by graph between entropy change and temperature is