CIE Physical Chemistry Quizz 2 Welcome to your CIE Physical Chemistry Quizz 2 Enthalpy changes of combustion of carbon monoxide,hydrogen and methanol are given as -283kJ/mol and -286 kJ/mol and -671kJ/mol respectively. What is the heat of reaction of formation of methanol from carbon monoxide and hydrogen? -184 kJ/mol 184 kJ/mol 102 kJ/mol -102 kJ/mol Which of the following statement is true about C-H bond?I. Bond energy of C-H is not same for all C-H bondsII. Bond beaking energy is positiveIII. C-H bond is polar I and II only II and III only I, II and III I and III only Calorimetery is usually used to find out: Enthaply of combustion Enthalpy of formation Bond energy Ionization energy Which of the following order is correct such that first compound has most negetive lattice enthalpy and last one has least negetive? MgO, BaCl2, KCl KCl, BaCl2, MgO BaCl2, MgO, KCl KCl, MgO, BaCl2 What causes difference in theoretical and Born Haber lattice enthalpies? Polaisation of negative ion 100% ionic character of compound Spherical shape of ions All of the options What can be said about entropy change when solid ammonium chloride decomposes to ammonia and hydrogen chloride gas? Positive negative remains same unpredictable Enthalpy change for a reaction is independent of the route by which the chemical change takes place. This statement is the definition of Hess's Law Enthalpy change Maxwell boltzman' law Born Haber cycle Oxidation number of Carbon in carbonate ion is? .+4 -4 .+2 -6 All uncombined elements have an oxidation number of zero 1 -1 2 Iron reacts with hydrochloric acid to form iron(II)chloride and hydrogen gas. Which of the following is true about iron in this reaction? It has oxidised It has reduced It oxidises and reduces at the same time Its oxidation state does not change What material is used as electrode of standard hydrogen electrode (SHE)? Platinum Silver Copper Titanium Which of the following statement is true? Half cell with more negative E⦵ oxidises Half cell with more negative E⦵ reduces Powerful oxidising agents have lower oxidation numbers The voltage of a cell is obtained by subtracting the higher positive value from the other value. To make the electrode a standard reference electrode, hydrogen gas must be at a pressure of 100 kPa 100 Pa 1000 kPa 1000 Pa Which of the following is usually used for making a salt bridge Potassium Nitrate Sodium oxide Carbonate ion Iron III chloride Which of the following affect the Ecell?I. ConcentrationII. Temperature I and II I only II only None of them Time is Up!