####17. Which of the following pairs has the same size?
[2010]
(a) $Fe^{2+}, Ni^{2+}$
(b) $Zr^{4+}, Ti^{4+}$
(c) $Zr^{4+}, Hf^{4+}$
(d) $Zn^{2+}, Hf^{4+}$
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