Question

What happens when (a) magensium in burnt in air, (b) quicklime is heated with silica, (c ) chlorine reacts with slaked lime and (d) calcium nitrate is heated?

Answer 1

(i) Magnesium burns in air with a dazzling light to form MgO and `Mg_(3)N_(2)`
`2Mg+O_(2)overset("Burning")rarr 2MgO`
`3Mg+N_(2)overset("Burning")rarr Mg_(3)N_(2)`
. (ii) Quick lime (CaO) combines with silica `(SiO_(2))` to form slag.
`CaO+SiO_(2)overset("heat")rarrCaSiO_(3)`
(iii) When chloride is added to slaked lime, it gives bleaching powder.
`Ca(OH)_(2)+Cl_(2)overset(Delta)rarrCaOCl_(2)+H_(2)O`
Bleaching
Powder
(iv) Calcium nitrate, on heating, decomposes to give calcium oxide.
`2Ca(NO_(3))_(2(s))overset(Delta)rarr2CaO_((s))+4NO_(2(g))+O_(2(g))`