A balanced redox equation must have which of the following: I. The same number o

Question

A balanced redox equation must have which of the following: I. The same number of each type of atom on both sides of the equation II. The total number electrons lost in the oxidation equal to total number of electrons gained in the reduction. III. The same total charge of all ionic species on both sides of the reaction IV. H_2O present as a product or a reactant a. I, II, and III b. I and II c. I, III, and IV d. I, II, III, and IV e. III and IV For the following reaction at equilibrium in a reaction vessel, which one of these changes we cause the Br_2 concentration to increase? 2NOBr(g) 2NO(g) + Br_2(g), Delta H degree_rxn = 30 kJ/mol a. Lower the temperature. b. Remove some NO. c. Remove some NOBr. d. Compress the gas mixture into a smaller volume. e. Add a catalyst Which of the following yields a buffer solution when equal volumes of the two solution a. 0.10 M NH_3 and 0.10 M HCl b. 0.10 M NH_4^+ and 0.10 M KOH c. 0.20 M NH_3 and 0.10 M KOH d. 0.20 M NH_3 and 0.10 M HCl e. 0.20 M NH_4^+ and 0.10 M HCl

Explanation / Answer

37) b. I and II because in the redox reaction, the number of atoms and electrons should be same on the both side

38) b. remove some NO will lead to increase in the [Br2] because according to le chatelier principle the removal of NO will lead to the reaction in the forward direction.

39) d . 0.20M NH3 and 0.10M HCl becasue half of the NH3 react with HCl and gives NH4+ and there is still NH3 present therefrore there are NH3/NH4+ ions which leads to form a buffer solution

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