1101. Evaporation of water is :
A. An exothermic change
B. An endothermic change *
C. A procedure in which no heat changes
D. A process accompanied by chemical reaction
1102. An endothermic reaction is one in which :
A. Heat is converted into electricity
B. Heat is absorbed *
C. Heat is evolved
D. Heat is converted into mechanical work
1103. An exothermic reaction occurs when the substances that are reacting:
A. Be more active than the goods *
B. Have less energy than the products
C. Have the same amount of energy as the goods
D. Are at a temperature higher than the goods
1104. From the above data , the standard heat of formation of KOH in kcal Mol-I is :
A. – 68 + 48 – 14
B. – 68 – 48 + 14 *
C. 68 – 48 + 14
D. 68 + 48 + 14
1105. Hess’s law deals with :
A. Changes in heat or reaction *
B. Rate of reaction
C. Equilibrium constant
D. Impact of tension on volume of a gas
1106. 70960 and -71030 cal mol-l, respectively, of heat are produced when homoclinic and monoclinic sulfur are burned. How much heat will it take for rhombic sulfur to become monoclinic?
A. 70960 Calories
B. 71030 calories
C. – 70 Calories
D. + 70 Calories
1107. All natural processes spontaneously move in a certain direction that leads to:
A. Decrease of entropy
B. Increase of Enthalpy
C. Increase of free energy
D. Decrease of free energy *
1108. For a system in equilibrium G=O under conditions of constant :
A. Temperature and pressure *
B. Temperature and volume
C. Pressure and volume
D. Energy and volume
1109. The values for reaction are 100 and 200 KJ respectively . The heat of reaction for will be :
A. 50 KJ
B. 100 KJ
C. 150 KJ
D. 300 KJ *
1110. The law of lavoisier and laplace illustrates :
A. The foundation of energy-based conversation *
B. Equivalent of mechanical and thermal energy
C. The principle of conservation of matter
D. Equivalent of mechanical and chemical energy