Chapter 19: Q.10E (page 1092)
Would you expect an aqueous manganese (VII) oxide solution to have a pH greater or less than 7.0? Justify your answer.
An aqueous manganese (VII) oxide has pH less than 7.0 because it is an acid.
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Which of the following is the strongest oxidizing agent: \(VO_4^3,CrO_4^{2 - },\)or \(MnO_4^ - \)?
Trimethylphosphine, \(P{\left( {C{H_3}} \right)_3}\) can act as a ligand by donating the lone pair of electrons on the phosphorus atom. If trimethylphosphine is added to a solution of nickel \(\left( {II} \right)\) chloride in acetone, a blue compound that has a molecular mass of approximately \(270 g\) and contains \(21.5\% Ni,26.0\% Cl,\)and \(52.5\% P{\left( {C{H_3}} \right)_3}\) can be isolated. This blue compound does not have any isomeric forms. What are the geometry and molecular formula of the blue compound?
Give the coordination numbers and write the formulas for each of the following, including all isomers where appropriate:
(a) tetrahydroxozincate(II) ion (tetrahedral)
(b) hexacyanopalladate(IV) ion
(c) dichloroaurate(I) ion (note that aurum is Latin for “gold”)
(d) diamminedichloroplatinum(II)
(e) potassium diamminetetrachlorochromate(III)
(f) hexaamminecobalt(III) hexacyanochromate(III)
(g) dibromobis(ethylenediamine) cobalt(III) nitrate
How many unpaired electrons are present in each of the following?
\(\begin{aligned}{}(a){\left( {Co{F_6}} \right)^{3 - }}(highspin)\\(b){\left( {Mn{{(CN)}_6}} \right)^{3 - }}(lowspin)\\(c){\left( {Mn{{(CN)}_6}} \right)^{4 - }}(lowspin)\\(d){\left( {MnC{l_6}} \right)^{4 - }}(highspin)\\(e){\left( {RhC{l_6}} \right)^{3 - }}(lowspin)\end{aligned}\)
Give the oxidation state of the metal for each of the following oxides of the first transition series. (Hint: Oxides of formula M3O4 are examples of mixed valence compounds in which the metal ion is present in more than one oxidation state. It is possible to write these compound formulas in the equivalent format MO∙M2O3, to permitestimation of the metal’s two oxidation states.)
(a) Sc2O3
(b) TiO2
(c) V2O5
(d) CrO3
(e) MnO2
(f) Fe3O4
(g) Co3O4
(h) NiO
(i) Cu2O
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