Complete and balance the following redox equation. When properly balanced using

Question

Complete and balance the following redox equation. When properly balanced using the smallest whole-number coefficients, the coefficient of S is H_2S + HNO_3 rightarrow S + NO (acidic solution) a. 1 b. 2 c. 3 d. 5 e. 6 a. chlorine b. fluorine c. nitrogen d. oxygen e. sulfur 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. Ill and IV Calculate E_cell degree for the following reaction: 2Fe^2+(aq) + Cd^2+(aq) rightarrow 2Fe^3+(aq) + Cd(s) a. -0.37 B b. 0.37 V c. -1.17 V d. 1.17 V e. None of these.

Explanation / Answer

37 ) H2S = S + 2H+ + 2e-

HNO3 + 3H+ + 3e-= NO + 2 H2O

3 H2S + 2 HNO3 = 3 S + 2 NO + 4 H2O

there for coefficient of s is 3 so ans is c

38) sulfur is appear as non gas at room temperature

39) a is answer

40) here

2Fe2+ ---> 2Fe3+ + 2e- Eo = -0.77 V

Cd2+ 2e- ---> Cd Eo = -0.40 V
Ecell = Eredred - Eredox
Ecell = - 0.40 - (-0.77) = +0.37 V

so ans is B

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