Questions #46-49 refer to the following reactions: A) 2 Mg (s) + O2 (g) à 2 MgO

Question

Questions #46-49 refer to the following reactions: A) 2 Mg (s) + O2 (g) à 2 MgO (s) B) Pb (aq) + CrO, (a) à PbCrO,(s) C) SO, (g) 2H,O (l) à H,O (aq) + HSO4 (aq) D) 2 H2O à 2H2(g) + O2(g) E) C,HI2) +8 02 (g) à 5 CO2(g) 6HO(g) F) Na CO, (aa) +Ba(NO,)2 (aq) à BaCO, (s) +2NaNO, (aq) 46. Combustion Reaction 47. Metathesis Reaction 48. An oxidation-reduction reaction that is also a synthesis reaction. 49. Endothermic decomposition 50. Write the electron configuration for iron, and explain the color differences in aqueous iron chloride solutions.

Explanation / Answer

46. (a) and (e) are the combustion reactions. here oxygen Mg and C5H12 to MgO and CO2 respectively.

47. (f) is a metathesis reaction. metathesis reaction involves the echange of unit, ions or groups. Here, carbonate ant nitrate ions are exchanged between sodium and barium.

48. (d) and (e) are oxidation reduction reaction.

49. (d) water gets decomposed to hydrogen and oxygen

50. [Ar]3d64s2. FeCl3 is yellow in colour and is due to the d-d transition of hexahydrated form of iron(iii),

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