Answer
a) Ca$^{2+}$
b) Hg$_{2}$$^{2+}$
c) Cu$^{+}$
d) Hg$^{2+}$
Work Step by Step
a) Ca$^{2+}$
b) Hg$_{2}$$^{2+}$
c) Cu$^{+}$
d) Hg$^{2+}$
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