What happens when:

Options

A. magnesium is burnt in air
B. Quicklime is heated with silica
C. Chlorine reacts with slaked lime
D. Calcium nitrate is heated

Explanation

(i). When magnesium is burnt in air, it gives brilliant flame forming magnesium oxide and magnesium nitride.
`2Mg+O_(2)rarr2MgO` (Magnesium oxide)
`3Mg+N_(2)rarrMg_(3)N_(2)` (Magnesium nitride)
(ii). When quicklime `(CaO)` is heated with silica, it forms calcium silicate.
`CaO+SiO_(2)overset(Above 1270 K)(rarr) underset(("Calcium sillicate"))(CaSiO_(3))`
(iii). When chlorine reacts with slaked lime, it forms bleaching powder.
`underset(("Slaked lime"))(Ca(OH)_(2))+Cl_(2)rarrunderset(("Bleaching powder"))(CaOCl_(2)+H_(2)O)`
(iv). When calcium nitrate is heated, it decomposed to give `CaO,NO_(2)` and `O_(2)`.
`2Ca(NO_(3))_(2)overset(rarr)2CaCO+4NO_(2)+O_(2)uarr`