The metalloproteins hemoglobin and vitamin B12 contain the metals
A) iron and zinc,respectively.
B) cobalt and nickel,respectively.
C) iron and Mo,respectively.
D) manganese and iron,respectively.
E) iron and cobalt,respectively.
Correct Answer:
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Q4: The lanthanide contraction results because
A) the shielding
Q9: Of the following, which possesses the smallest
Q10: Which of the following is expected to
Q12: Which of the following would be the
Q14: The maximum oxidation states for chromium and
Q15: Vanadium metal is produced by the
A) reduction
Q17: Most d-block elements have only one common
Q19: For a given metal,the oxides become more
Q20: Which of the following is likely to
Q21: Complexes with coordination number 4 are either
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