1. What is the coordination number around the central metal atom in ammonium diaquabis(oxalato)nickelate(II) ((NH₄)₂[Ni(

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1. What is the coordination number around the central metal atom
in ammonium diaquabis(oxalato)nickelate(II)
((NH₄)₂[Ni(C₂O₄)₂(H₂O)₂])?
2. A galvanic cell is represented by the shorthand Cu |
Cu²⁺ || Ag⁺ | Ag. Which reaction occurs at the anode?
A) Cu(s) → Cu²⁺(aq) + 2e⁻
B) Ag⁺(aq) + e⁻ → Ag(s)
C) Cu²⁺(aq) + 2e⁻ → Cu(s)
D) Ag(s) → Ag⁺(aq) + e⁻
3.
What nuclide undergoes neutron emission to form ⁸⁷Br?
A) ⁸⁶Br
B) ⁸⁷Se
C) ⁸⁷Kr
D) ⁹¹Rb
E) ⁸⁸Br