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3.5 Write the systematic name of each of the following \begin{aligned} &\text { compounds: (a) } \mathrm{K}_{2} \mathrm{SO}_{4} ; \text { ( b) } \mathrm{Mn}(\mathrm{OH})_{2} ; \text { (c) }

\mathrm{Fe}\left(\mathrm{NO}_{3}\right)_{2} \text { ; }\\ &\text { (d) } \mathrm{KH}_{2} \mathrm{PO}_{4} ; \text { (e) } \mathrm{Ca}\left(\mathrm{C}_{2} \mathrm{H}_{3} \mathrm{O}_{2}\right)_{2} ; \text { (f) } \mathrm{Na}_{2} \mathrm{CO}_{3} \text { . } \end{aligned}

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