Chemical Thermodynamics MCQs Question and Answer in Engineering Chemistry

A. the enthalpy of vaporization is always endothermic

B. the enthalpy of vaporization is always exothermic

C. the enthalpy of vaporization is zero

D. the internal pressure of the liquid is less than that of the gas

A. (dS)_U,V > 0

B. (dS)_T,p > 0

C. (dS)_H,p < 0

D. (dS)_T,V < 0

A. ΔS_sys > 0

B. ΔS_surr > 0

C. ΔS_sys + ΔS_surr > 0

D. ΔS_sys - ΔS_surr > 0

A. zero

B. -R In2

C. R In2

D. 2R In2

A. V

B. S

C. -S

D. -V

A. 200 g of water at 40°C

B. 100 g of water at 20°C

C. 150 g of water at 50°C

D. 300 g of water at 30°C

A. N₂(g) + 3H₂(g) → 2NH₃(g)

B. C₆H₁₂O₆(s) + 6O₂(g) → 6CO₂(g) + 6H₂O($$l$$)

C. PCl₅(s) → PCl₃($$l$$) + Cl₂(g)

D. 2H₂O($$l$$) → 2H₂(g) + O₂(g)

A. dU_S,V ≥ 0

B. dA_T,V ≥ 0

C. dS_U,V ≥ 0

D. dG_p,V ≤ 0

A. RT In2

B. -2RT

C. -RT ln2

D. 2RT

A. W and U are path functions but Q and S are state functions

B. W and S are path functions but Q and U are state functions

C. S and U are path functions but Q and W are state functions

D. W and Q are path functions but U and S are state functions