1 year n0tes chemistry new st CHAPTER 7 THERMOCHEMISTRY MCQs Q.1 Which of the following statements is contrary to the first law of thermodynamics?
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1 year n0te chemitry new t CHAPTER 7 THERMOCHEMISTRY MCQ Q.1 Which of the following tatement i contrary to the firt law of thermodynamic? (a) energy can neither be created nor detroyed (b) one form of energy can be tranferred into an equivalent amount of other kind of energy (c) in an adiabatic proce, the work done i independent of it path (d) continuou production of mechanical work with out equivalent amount of heat i poible Q.2 The change in heat energy of a chemical reaction at contant temperature and preure i called (a) enthalpy change (b) bond energy (c) heat of ublimation (d) internal energy change Q.3 For the reaction NaOH + HCl NaCl + H2O, the change in enthalpy i called a: (a) heat of reaction (b) heat of formation (c) heat of neutralization (d) heat of combution Q.4 Calorie i equivalent to (a) J (b) J (c) J (d) J Q.5 For a given proce, the heat change at preure (qp) and contant volume (qv) are related to each other a (a) qp = qv (b) qp < qv (c) qp > qv (d) qp = 1
2 year n0te chemitry new t Q.6 The net heat change in a chemical reaction i ame whether. It i brought about in two or more different way in one or everal tep. It i known a (a) Henry law (b) Joule principle (c) He law (d) Law of conervation of energy Q.7 Enthalpy of neutraliation of all the trong acid and trong bae ha the ame value becaue (a) neutraliation lead to the formation of alt and H2O (b) trong acid and bae are ionic ubtance (c) acid alway give rie to H+ ion and bae alway furnih OH ion (d) the net chemical change involve the combination of H+ and OH ion to form water Q.8 If an endothermic reaction i allowed to take place very rapidly in the air. The temperature of the urrounding air (a) remain contant (b) increae (c) decreae (d) remain unchanged Q.9 In endothermic reaction, the heat content of the (a) product i more than that of reactant (b) reactant i more than that of product (c) both (a) and (b) Q.10 He law i alo called (a) firt law of thermodynamic (b) econd law of thermodynamic (c) firt law of thermochemitry (d) econd law of thermochemitry Q.11 Preure volume work i (a) P D v (b) F x d (c) h v (d) H + p v Q.12 Kinetic energy of molecule i due to (a) rotational energy (b) vibrational energy 2
3 year n0te chemitry new t (c) tranlational energy (d) all of thee Q.13 The condition for tandard enthalpy change i (a) 1 atm 30oC (b) 1 atm 0oC (c) 1 atm 25oC (d) 760 atm 25oC Q.14 The unit of enthalpy change i (a) calorie (b) joule (c) volt (d) coulomb Q.15 The um of all kind of a ytem i ion or molecule of a ytem i (a) vibrational energy (b) potential energy (c) kinetic energy (d) internal energy Q.16 An endothermic reaction i one i which (a) enthalpy of reactant and product are ame (b) enthalpy of product i greater than reactant (c) enthalpy of product i leer than reactant (d) heat i evolved from ytem Q.17 Bomb calorimeter i ued to determine (a) enthalpy of olution (b) enthalpy of atomization (c) enthalpy of combution (d) enthalpy of neutralization Q.18 Gla calorimeter i ued to determine (a) enthalpy of combution (b) enthalpy of reaction (c) preure volume work Q.19 Born Haber cycle i ued to calculate (a) enthalpy of combution (b) lattice energy of ionic camp (c) both a and b Q.20 Born Haber cycle i an application of (a) firt law of thermodynamic 3
4 year n0te chemitry new t (b) econd law of thermodynamic (c) firt law of thermochemitry (d) He law Q.21 An exothermic reaction i one in which (a) enthalpy of reactant and product are ame (b) heat i aborbed by ytem (c) enthalpy of product i greater than reactant (d) enthalpy of reactant i leer than product Q.22 A ubtance under obervation during an experiment (a) urrounding (b) ytem (c) tate function (d) univere Q.23 Enthalpy of neutralization i merely (a) heat of olution (b) heat of atomization (c) heat of combution (d) heat of formation of H2O Q.24 Lattice energy of NaCl i (a) kj (b) 344 kj (c) 776 kj (d) 411 kj Q.25 Standard enthalpy of Al2O3 cannot be meaured becaue (a) it doe not catch fire (b) it react with CO2 (c) protective layer of oxide cover the urface Q.26 Ammonium chloride diolve in water thi proce i (a) endothermic proce (b) exothermic proce (c) imple hydration Q.27 Firt law of thermodynamic i repreented a (a) D E = q + R T (b) D E = q + D P (c) E = q + P (d) E = q + w Q.28 Pumping of water uphill i (a) pontaneou reaction (b) exothermic reaction (c) (d) non pontaneou reaction endothermic 4
5 year n0te chemitry new t Q.29 In exothermic reaction D H i (a) poitive (b) negative (c) zero ANSWERS Quetion Anwer D a c c C Quetion Anwer c d c c D Quetion Anwer a d c a d Quetion Anwer b c b b d Quetion Anwer c b d c c Quetion Anwer a d b b 5
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