Answer :

(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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