[{"id":1066203,"question":"The SI unit of enthalpy","choices":[{"text":"Calorie","value":"A"},{"text":"eV","value":"B"},{"text":"kj mol-1","value":"C"},{"text":"J mol-1","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":1066202,"question":"Delta H for an endothermic reaction is","choices":[{"text":"Positive","value":"A"},{"text":"Negative","value":"B"},{"text":"Zero","value":"C"},{"text":"Depends on temperature","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":1066201,"question":"Which of the following is always negative in an exothermic reaction.","choices":[{"text":"Delta H","value":"A"},{"text":"Activation energy","value":"B"},{"text":"Entropy ","value":"C"},{"text":"Delta S","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":1066200,"question":"Consider a reaction with Delta H > 0 and Delta S<0 this reaction will be","choices":[{"text":"Spontaneous at all temperaturres","value":"A"},{"text":"Non spontaneous at all temperature","value":"B"},{"text":"Spontaneous only at high temperatures","value":"C"},{"text":"Spontaneous only atlow temperature","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":1066199,"question":"The enthalpy change for a reaction depends on.","choices":[{"text":"Pathway taken from reactants to products","value":"A"},{"text":"Presence of a catalyst","value":"B"},{"text":"Intitial and final states of the reactants and products","value":"C"},{"text":"Rate of the reaction","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":1066198,"question":"Which of the followng factors would lead to a greater enthalpy chage of hydration .","choices":[{"text":"A larger ionic reduis and a smaller charge","value":"A"},{"text":"A smaller ionic radius and a smaller charge","value":"B"},{"text":"A larger ionic radius and a larger charge","value":"C"},{"text":"A smaller ionic radius and alarger charge","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":1066197,"question":"Which of the followng quantitites is NOT typically determined using Hess's Law.","choices":[{"text":"Enthalpy change of formation ","value":"A"},{"text":"Activation energy","value":"B"},{"text":"Enthalpy chage f combustion","value":"C"},{"text":"Enthalpy chage of reaction ","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":1066196,"question":"The calorie content of food, often expressed in Calories (keal), is fundamentally related to which thermodynamic quantity during its metabolism or combustion.","choices":[{"text":"Enthealpy change","value":"A"},{"text":"Entropy change","value":"B"},{"text":"Gibbs free engnergy change","value":"C"},{"text":"Specific heat capacity","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":1066195,"question":"Suppose there are 100 molecules of a gas initially in jar A, which is connected to an evacuated jar B, When the stopcock is opened, the positive ways of arrangement of molecules will be ","choices":[{"text":"100","value":"A"},{"text":"1/100","value":"B"},{"text":"2/100","value":"C"},{"text":"1/2 ","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":1066194,"question":"<p>Liquid crystals are used in thermometers becasue.</p>\r\n","choices":[{"text":"<p>They arehighly reflective</p>\r\n","value":"A"},{"text":"<p>They glow at high temperatures</p>\r\n","value":"B"},{"text":"<p>Their color changes with temperature</p>\r\n","value":"C"},{"text":"<p>They conduct electricity</p>\r\n","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":1066193,"question":"<p>Which of the following is NOT a property of liqud crystals.</p>\r\n","choices":[{"text":"<p>Fludity</p>\r\n","value":"A"},{"text":"<p>Rigidity like crystals</p>\r\n","value":"B"},{"text":"<p>Complete isotropy</p>\r\n","value":"C"},{"text":"<p>Viscosity</p>\r\n","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":1066192,"question":"<p>Why are cholestric liuquid crystals useful in medical diagonostics.</p>\r\n","choices":[{"text":"<p>They kill bacteria</p>\r\n","value":"A"},{"text":"<p>They reat with tumors chemically</p>\r\n","value":"B"},{"text":"<p>They detect temperatur edifferences</p>\r\n","value":"C"},{"text":"<p>They absorb X -rays</p>\r\n","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":1066190,"question":"<p>Which of the following is a unique optical property of liquid crystals.</p>\r\n","choices":[{"text":"<p>They reflect ultravolet light</p>\r\n","value":"A"},{"text":"<p>They are always opaque</p>\r\n","value":"B"},{"text":"<p>They are anisotropic</p>\r\n","value":"C"},{"text":"<p>They are isotropic</p>\r\n","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":1066189,"question":"<p>Liquid crystals exhibit properties of</p>\r\n","choices":[{"text":"<p>Only solid</p>\r\n","value":"A"},{"text":"<p>Only liquid</p>\r\n","value":"B"},{"text":"<p>Both solids and liquids</p>\r\n","value":"C"},{"text":"<p>Gases and solids</p>\r\n","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":1066188,"question":"<p>What typ of molecular shape in communly found in liquid crystals.</p>\r\n","choices":[{"text":"<p>Spherical</p>\r\n","value":"A"},{"text":"<p>Rod like and elongated</p>\r\n","value":"B"},{"text":"<p>Spiral</p>\r\n","value":"C"},{"text":"<p>Cubic</p>\r\n","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":1066187,"question":"<p>Which of the followign best describes the molecular arrangemetn in liquid crystals.</p>\r\n","choices":[{"text":"<p>Random and disordered</p>\r\n","value":"A"},{"text":"<p>Fixed in all direcions</p>\r\n","value":"B"},{"text":"<p>Parallel and partically ordered</p>\r\n","value":"C"},{"text":"<p>Compleely rigid and fixed</p>\r\n","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":1066186,"question":"<p>What happens to the shae of a NaCl crystal when 10% urea is present in its solution.</p>\r\n","choices":[{"text":"<p>It becomes needle like</p>\r\n","value":"A"},{"text":"<p>It becomes larger</p>\r\n","value":"B"},{"text":"<p>It reamains the same</p>\r\n","value":"C"},{"text":"<p>It becomes cubic</p>\r\n","value":"D"},{"value":"E"}],"correctAnswer":1}]