Q1.For the reaction, 2 Cl(g)→ Cl2(g) , what are the signs of ΔH and ΔS?
Answer : Option BExplaination / Solution:
As in this cas e bond formation between two Cl atom is taking place so energy will be released so ΔH<0 and since 2 atoms are combining to form 1 molecule randomness decreases so ΔS<0.
for the reaction 2 A(g)+ B(g)→ 2D(g)ΔU0=−10.5 kJ and ΔS0=−44.1 JK−1. Calculate ΔG0for the reaction, and predict whether the reaction may occur spontaneously.
Q4.Calculate the heat and the work associated with a process in which 5.00 mol of gas expands reversibly at constant temperature T = 298 K from a pressure of 10.00 to 1.00 atm
Answer : Option BExplaination / Solution:
for isothermal process ΔU=0 while –w=nRTln(P1/P2) = q
Answer : Option BExplaination / Solution:
Thermodynamics on tells that whether reaction will give take place or not. It doesnot tell the rate at which reaction will occur.
Q10.Enthalpy of sublimation of a substance is equal to
Answer : Option AExplaination / Solution:
The process of sublimation involves the change of solid into vapour. Though in sublimation a solid does not pass through the liquid phase on its way to the gas phase, the enthalpy change is equal to the sum of enthalpy of fusion and enthalpy of vaporization because enthalpy is a state function.
Total Question/Mark :
Scored Mark :
Mark for Correct Answer : 1
Mark for Wrong Answer : -0.5
Mark for Left Answer : 0