Ca(NO3)2 is a possible compound formed from Ca²+ and NO3-¹.
- Ions, which are charged atoms of elements come together to form ionic compounds.
- A positively charged ion called cation reacts with a negatively charged ion called anion to form a neutral ionic compound i.e. compound with a charge of 0.
- In this question, cation Ca²+ reacts with anion NO3-. The ionic compound formed must have a net charge of 0. This can only happen if 2 moles of NO3- and 1 mole of Ca²+ is present in the compound.
- The resulting ionic compound can be chemically represented as Ca(NO3)2.
- Therefore, Ca(NO3)2 is a possible compound formed from Ca²+ and NO3-¹.
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