Discuss on : (iii) Nitrates of alkaline earth metals.

Explanation

Nitrates: These can be prepared by dissolving their carbonates in dilute nitric acid. These crystallise from their solution as their hydrates. Barium nitrate crystallise as anhydrous salt. This is because of the decrease in the hydration enthalpies. All these nitrates decompose on heating.
`2M(NO_3)_(2) to 2 MO + 4NO_(2) + O_(2)`
`(M = Be , Mg, Ca, Sr, Ba)`.