Based on the reactions and data below, which reaction is least spontaneous? Redu

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Based on the reactions and data below, which reaction is least spontaneous? Reduction E^(V) 2 Hg^2+ + 2e^- rightarrow Hg_2^2+ 1.82 I_2 + 2e^- rightarrow 2 I^- 0.53 2 H_2 O + 2 e^- rightarrow H_2 + 2 OH^- -0.83 (A) 2Hg^2+ + 2I^- rightarrow Hg_2^2+ + I_2 (B) H_2 + 2OH^- + I_2 rightarrow 2 H_2 O + 2 I^- (C) 2 H_2 O + Hg_2^2+ rightarrow H_2 + 2 OH^- +2 Hg^2+ (D) H_2 + 2 OH^- + 2 Hg^2- rightarrow 2 H_2 O + Hg_2^2+ An increase in pH will promote which of the reactions below?I. 2 MnO_4^- + MnO_2 +4 OH^- rightarrow 3 MnO_4^2- + 2 H_2 O II. 6 CI_2 + 2 I^- + 6 H_2 O rightarrow 12 CI^- + 2 IO_3^- + 12 H (A) I Only (B) II only (C) Both I and II (D) Neither I nor II Given the reactions and data below, what is the K value for this electrochemical cell? Cu|CuNO_3 (1.0 M) Gamma (1.0 M), i_2 (1.0 M) (Pt at 25 degree C Reaction E degree (V) Cu^+ + e^- rightarrow Cu 0.518 I_2 + 2e^- rightarrow 2 I^- 0.534 (A) 0.288 (B) 1.86 (C) 2.23 (D) 3.48 The advantages of methane fuel cells over internal combustion engines (ICEs) that burn methane include which of the following? I. Methane fuel cells are less polluting II. Methane fuel cells are more efficient. III. Methane fuel cells are less expensive (A) I only (B) I and II only (C) I and III only (D) II and III only A steady current of 1.20 Ampere is passed through a solution of MCI_2 for 2 hours and 33 minutes. If 2.98 g of metal M are plated out, what is the identify of the metal? (A) AI (B) Cr (C) Ni (D) Zn MnO_4^- + 5 Fe^2+ + 8H^+ rightarrow Mn^2+ + 5 Fe^3+ + 4 H_2 O E degree = 0.743 What is the value of E for the cell based on the reaction above at 25 degree C for the following conditions? (A) 0.20 V (B) 0.45 V (C) 0.64 V (D) 1.28 V How many angular nodes does a d orbital possess? (A) 1 (B) 2 (C) 3 (D) 4 for the transition metal with the electron configuration 1s^2 2s^2 2p^3 3s^2 3p^6 4s^2 3d^6, how many unpaired electrons are present in its +2 ion in the ground state? (A) 0 (B) 2 (C) 4 (D) 6 What is the velocity of an electron (m = 9.11 times 10^-23 g) the exhibits a de Broglie wavelength of 10.0 nm? [1 J = 1 kg middot m^2 s^-2] (A) 72.7 m middot s^-1 (B) 270 m middot s^-1 (C) 7.27 times 10^4 m middot s^-1 (D) 7.27 times 10^6 m middot s^-1 Which atom has the highest first ionization energy? (A) AI (B) Si (C) P (D) S What are the two most common oxidation states for antimony? (A) -1 and -3 (B) -1 and + 2 (C) +3 and -3 (D) +3 and +5 For which pair of species are the radii most similar? (A) Li and Na (B) Na and Mg (C) Mn and Fe (D) Fe^2+ and Fe^3+ When arranged in order of increasing bond strength which order is correct? (A) O-O

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(38) : (C) both, because increasing the pH increases the OH- concentration and decreases H+ conc. as well

(44) : (C), in the five 3d orbitals, 6e- remain, 2 of which are paired and rest are not

(46) : (C) Phosphorous has the highest first ionization energy among the elements given

(52) : (B) square planar

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