The mathematical expression for the first law of thermodynamics for a steady-state flow processes is
A.? H = Q + Ws
B.?H = Q-Ws
C.?U = Q-Ws
D.?U = Q + Ws
Category: Chemical Thermodynamics Mcqs
Select the wrong statement
A.Voltaic cell uses exothermic chemical reactions to produce electrical energy
B.In the voltaic cell the positive current flows from the positive electrode to the negative electrode outside the cell
C.A voltaic cell can become an electrolysis cell by use of an external voltage greater than the voltaic cell voltage and imposed in the opposite directions
D.Voltaic cell uses electrical energy to produce endothermic chemical changes
Lenzs law is a consequence of the law of conservation of
A.mass
B.energy
C.linear momentum
D.angular momentum
The internal energy of a substance
A.decreases with increase in temperature
B.increases with increase in temperature
C.ramains unaffected with change in temperature
D.can be calculated by the relation E = mc2
A vessel has two compartments A and B containing H2 and O2 respectively both at one atmospheric pressure. If the wall separating the two compartments is removed
A.the pressure will remain unchanged
B.the pressure will increase in A
C.the pressure will increase in B
D.the pressure will increase both in A and B
A system is said to be an isolated system if
A.only the mass crosses the system boundary
B.only the energy crosses the system boundary
C.both energy and mass crosses the system boundary
D.neither energy nor mass crosses the system boundary
Which of the following is an intensive property
A.Internal energy
B.Enthalpy
C.Density
D.Volume
