1151. In general , for exothermic reactions to be spontaneous :
A. Temperature should be high
B. Temperature should be zero
C. Temperature should be low *
D. Temperature has no effect
1152. Dormant intensity of vaporization of a fluid at 500 K and I atm pressure is 10.0 kcal/mol. How will the internal energy (E of 3 moles of liquid at the same temperature) change?
A. 13.0 kcal
B. -13.0kcal
C. 27.0 kcal *
D. -27.0kcal
1153. For a reaction to occur spontaneously :
A. H must be negative *
B. H must be positive
C. H must be zero
D. H must be unity
1154. When water is added to quick lime, the reaction is :
A. Explosive
B. Endothermic
C. Exothermic *
D. Photochemical
1155. The reaction is spontaneous if the cell potential is :
A. Positive *
B. Negative
C. Zero
D. Infinite
1156. Enthalpy of an exothermic reaction is always :
A. Positive
B. Negative *
C. Zero
D. May be positive or negative
1157. The heat absorbed at constant volume is equal to the system’s change in :
A. Enthalpy
B. Entropy
C. Entropy temperature
D. Internal energy *
1158. The heat of neutralization is maximum when :
A. Sodium hydroxide is killed by acidic corrosive
B. Ammonium hydroxide is killed by acidic corrosive
C. Ammonium hydroxide is neutralized by hydrochloric acid
D. Sodium hydroxide is neutralized by hydrochloric acid *
1159. The law of thermodynamics that provides the basis for the determination of absolute entropy of substance is :
A. Zeroth law
B. First law
C.Second law
D. Third law
1160. The enthalpy of water formation is as follows: 142.5 kJ of heat is required to decompose 9g of water.
A. -142.5 Kj
B. +142.5 Kj
C. -285 Kj *
D. +285 Kj