he following reaction is used for the preparation of oxygen gas in the laboratory:( ) ( ) ( )KClO s KCl s O g2 2 3CatalystHeat3 2+Which of the following statement(s) is(are) correct about the reaction?(a) It is a combination reaction.(b) It is a decomposition reaction and endothermic in nature.(c) It is a photochemical decomposition reaction and exothermic in nature.(d) It is a decomposition reaction and accompanied by release of heat

7. Use the following, balanced equation for the question below:2KClO3(s) → 2KCl(s) + 3O2(g)How many moles of KClO3 will be needed to produce 15.0 moles of oxygen gas?10.0 moles KClO315.0 moles KClO322.5 moles of KClO330.0 moles of KClO3

Which of the following statements is incorrect for the above chemical reaction ?Among three products one is solid and two are gases.Only one gaseous products is formed.Among the gaseous products one is brown gas and other is colourless gas.Yellow colour solid is formed

Identify the following type of reaction:2 H2O → 2 H2 + O2Question 18Select one:a.Decomposition b.Synthesisc.Single displacementd.Combustion

Identify the letter that best completes the statement or answers the question by circling or highlighting the ONE correct letter. (5 marks) 6. A chemical system in which ONLY energy can flow into or out of a system is described as a. a closed system d. a chemical system b. an open system e. none of the above c. an isolated system 7. The decomposition of ammonia into hydrogen and nitrogen gas has a molar enthalpy of reaction of +45.9 kJ/mol of ammonia. Which of the following would be the CORRECT thermochemical equation to represent this reaction. 2NH3(g) N2(g) + 3H2(g) + 45.9 kJ 2NH3(g) + 45.9 kJ N2(g) + 3H2(g) 2NH3(g) N2(g) + 3H2(g) + 91.8 kJ 2NH3(g) + 91.8 kJ N2(g) + 3H2(g) 2NH3(g) N2(g) + 3H2(g) ∆HRx = -45.9 kJ/mol NH3 8. Using the enthalpies of formation, what is the enthalpy change for the following reaction? CO2(g) → CO(g) + 1/2 O2(g) a. –283 kJ d. +506 kJ b. +283 kJ e. None of the above c. -506 kJ 9. Using the following thermochemical data: 1. C2H2(g) + 5/2 O2(g) → 2CO2(g) + H2O(l) ΔH = –1.30 × 103 kJ 2. C2H6(g) + 7/2 O2(g) → 2CO2(g) + 3H2O(l) ΔH = –1.56 × 103 kJ 3. H2(g) + 1/2 O2(g) → H2O(l) ΔH = –2.86 × 102 kJ What is ∆H for the following reaction? C2H6(g) → C2H2(g) + 2H2(g) a. -2.60 x 101 kJ d. -5.46 x 103 kJ b. -3.12 x 102 kJ e. 2.60 x 101 kJ c. +3.12 x 102 kJ f. none of the above 10. For the following reaction, the rate of consumption of Al(s) is -2.0 mol/L s. The rate of production of Na would be: ? a. 2 mol/Ls d. 18 mol/Ls b. 6 mol/Ls e. not enough information is given c. 9 mol/Ls f. none of the above

Multiple Select QuestionSelect all that applyWhich of the following reactions are exothermic? Choose all that apply.Multiple select question.2 NH3(g) → 3 H2(g) + N2(g)      ΔH = +22.0 kcal/molCH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l)     ΔH = -213 kcal/molC6H12O6(s) → 2 C2H6O(l) + 2 CO2(g)     ΔH = -16 kcal/mol