Name & Formula & }(c) Solubility (Soluble or Insoluble) Ruthenium(IV) nitrate & & Cobalt(II) carbonate & & & mathrm(Ni)(mathrm(OH))_(2) &

To fill in the blanks regarding the solubility of these compounds, we need to consider general solubility rules:<br /><br />1. **Ruthenium(IV) nitrate**: Nitrates are generally soluble in water. Therefore, Ruthenium(IV) nitrate would be soluble.<br /><br />2. **Cobalt(II) carbonate**: Carbonates are generally insoluble in water, except for those of alkali metals and ammonium. Therefore, Cobalt(II) carbonate would be insoluble.<br /><br />3. **Nickel(II) hydroxide ($Ni(OH)_2$)**: Hydroxides are generally insoluble in water, except for those of alkali metals and some alkaline earth metals like barium. Therefore, Nickel(II) hydroxide would be insoluble.<br /><br />So, the filled-in information is:<br />- Ruthenium(IV) nitrate: Soluble<br />- Cobalt(II) carbonate: Insoluble<br />- Nickel(II) hydroxide: Insoluble