18 In the complex ion [Cr(C₂O₄)₂(H₂O)₂]⁻, the oxidation number of Cr is(A)+1(B)+2(C)+3(D)+4(E)+5

22 Why is the bond dissociation energy of C-C greater than that of C-H?(A)due to enhanced sigma bond overlap.(B)because the bond is electrostatically stronger.(C)because multiple bonds are always stronger than single bonds.(D)due to the decreased bond dipole.(E)It is not; the dissociation energy is greater for C-H.