68 . Which of the following compounds can act as a Lewis base?
(A) HClO 2
(B) NH 2 NH 2
(C) NH 4 +
(D) BF 3
(E) None of the above
69 . Two electrons with the same n, l, and ml values
(A) must be in different atoms
(B) are in different orbitals of the same subshell
(C) are in the same orbital of the same subshell with opposite spins
(D) are indistinguishable from each other
(E) None of the above
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