What happens when (i) magnesium is burnt in air (ii) quick lime is heated with silica (iii) chlorine reacts with slaked lime (iv) calcium nitrate is heated ?

Explanation

a.`2Mg_((s))+O_(2g)overset(Delta)rarr2MgO_((s))`
b. `underset("Quicklime")(CaO_(s))+underset("Silica")(SiO_(2(s)))overset(Delta)rarrunderset("Calcuim silicate")(CaSiO_(3)(s))`
c. It reacts with `Cl_(2)` to form calcuim hypochlorite, `Ca(OC l)_(2)`-a constituent of bleaching powder.
b. `underset("Slaked lime")(2Ca(OH)_(2))+2Cl_(2)rarrubrace(CaCl_(2)+Ca(OCl)_(2))_("Bleaching powder")+2H_(2)O`
d. `2Ca(Na_(3))_2(s)overset(Delta)rarr 2CaO_(s)+4NO_2(g)+O_2(g)`