27. For each of the following pairs of substances, select the one expected to have the lower melting point: I. H2O, H2S II. HCl, NaCl III. CH4, C3H8 (A) H2O, HCl, C3H8 (B) H2O, NaCl, C3H8 (C) H2O, HCl, CH4 (D) H2S, HCl, CH4 (E) H2S, NaCl, CH4

35. The complex ions of Zn2+ are all colorless. The most likely explanation for this is: (A) Zn2+ is paramagnetic. (B) Zn2+ exhibits “d orbital” splittings in its complexes such that they absorb all wavelengths in the visible region. (C) Since Zn2+ is a d10 ion, it does not absorb visible light even though the “d orbital” splittings are correct for absorbing visible wavelengths. (D) Zn2+ is not a transition metal ion. (E) None of these is correct.

27. For each of the following pairs of substances, select the one expected to have the lower melting point:
I. H₂O, H₂S II. HCl, NaCl III. CH₄, C₃H₈
(A) H₂O, HCl, C₃H₈
(B) H₂O, NaCl, C₃H₈
(C) H₂O, HCl, CH₄
(D) H₂S, HCl, CH₄
(E) H₂S, NaCl, CH₄

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27. For each of the following pairs of substances, select the one expected to have the lower melting point: I. H2O, H2S II. HCl, NaCl III. CH4, C3H8(A) H2O, HCl, C3H8(B) H2O, NaCl, C3H8(C) H2O, HCl, CH4(D) H2S, HCl, CH4(E) H2S, NaCl, CH4

相關試題

相關試卷

27. For each of the following pairs of substances, select the one expected to have the lower melting point:
I. H₂O, H₂S II. HCl, NaCl III. CH₄, C₃H₈
(A) H₂O, HCl, C₃H₈
(B) H₂O, NaCl, C₃H₈
(C) H₂O, HCl, CH₄
(D) H₂S, HCl, CH₄
(E) H₂S, NaCl, CH₄