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?

(i) When magnesium is burnt in air, it forms magnesium oxide (MgO). The reaction taking place is given below:


2Mg (s) + O2 2MgO


(ii) When quick lime (CaO) is heated with silica (SiO2), it forms calcium silicate (CaSiO3). The reaction taking place is given below:



(iii) When chlorine reacts with slaked lime (Ca(OH)2), it forms calcium hypochlorite (Ca(OCl)2) and calcium chloride (CaCl2). Both products are constituents of bleaching powder. The reaction taking place is given below:



(iv) When calcium nitrate (Ca(NO3)2) is heated, it forms quick lime (CaO), nitrogen dioxide (NO2) and oxygen. The reaction taking place is given below:



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