Thermodynamics ...

Direction (Q. Nos. 1-7) This section contains 7 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.

Given,

The enthalpies of elements in their standard states are taken as zero. The enthalpy of formation of a compound

Given,

Diborane is a potential rocket fuel which undergoes combustion according to the reaction,

From the following data, enthalpy change for the combustion of diborane is 

Following diagram represents Born-Haber cycle to determine lattice energy of NaCI(s). It is based on Hess’s law of constant heat summation. Δ_latticeH° of 

Thus,

Given, HCI (g) → H (g) + Cl (g) at 298 K (say temperature T K),

For

Q. Thus, for the given reaction  (at 0 K) is

The measured enthalpy change for burning of ketene (g) (CH₂CO) is - 981.1 kJ mo^-1 at 298 K ,CH₂CO (g)+ 2O₂(g) → 2CO₂ (g) + H₂O (g) and that of CH₄ (g) is - 802.3 kJ mol^-1 at 298 K

Thus, enthalpy change at 298 K for the following thermochemical reaction is

Direction (Q. Nos. 8) This sectionis based on statement I and Statement II. Select the correct answer from the code given below.

Q. In the following thermochemical reactions,

Statement I : Enthalpy of combustion of CO(g) is - 26 kcal mol^-1.

Statement II : CO₂(g) is an exothermic compound.

Direction (Q. Nos. 11) Choice the correct combination of elements and column I and coloumn II  are given as option (a), (b), (c) and (d), out of which ONE option is correct.

Q. For liquid water at

Compare the parameters ΔH₁, ΔH₂ ... in Column I with the corresponding values in kJ in Column II.