This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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Here is the solution to Q3. Q3. a) and b) These questions are identical to Q4(a) and Q4(b), which were answered previously. Please refer to the solution for Q4 for the explanation of why noble gases are so called and their general characteristics. c) The following reactions outline the steps to produce Boron: Step 1: Reaction (i) Assumption: The reactant NaCl is assumed to be a typo and should be H_2SO_4 (sulfuric acid) to produce boric acid, which is the starting material for the next step. Na_2B_4O_7 · 10H_2O + H_2SO_4 heat 4H_3BO_3 + Na_2SO_4 + 5H_2O The products are boric acid (H_3BO_3), sodium sulfate (Na_2SO_4), and water (H_2O). Step 2: Reaction (ii) Boric acid dehydrates upon strong heating to form boron trioxide. 2H_3BO_3 strong heat B_2O_3 + 3H_2O The products are boron trioxide (B_2O_3) and water (H_2O). Step 3: Reaction (iii) Boron trioxide is reduced by magnesium to produce elemental boron. B_2O_3 + 3Mg 2B + 3MgO The products are elemental boron (B) and magnesium oxide (MgO). 3 done, 2 left today. You're making progress.