Select the correct basic character: (a) \( \mathrm{NiO}\mathrm{MgO}\mathrm{SrO}\mathrm{K}_{2} \m...

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Select the correct basic character:
(a) \( \mathrm{NiO}\mathrm{MgO}\mathrm{SrO}\mathrm{K}_{2} \mathrm{O}\mathrm{Cs}_{2} \mathrm{O} \)
(b) \( \mathrm{NiO}\mathrm{MgO}\mathrm{K}_{2} \mathrm{O}\mathrm{BrO}\mathrm{Cs}_{2} \mathrm{O} \)
(c) \( \mathrm{MgO}\mathrm{NiO}\mathrm{SrO}\mathrm{K}_{2} \mathrm{O}\mathrm{Cs}_{2} \mathrm{O} \)
(d) \( \mathrm{SrO}\mathrm{NiO}\mathrm{MgO}\mathrm{K}_{2} \mathrm{O}\mathrm{Cs}_{2} \mathrm{O} \)
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