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  Inorganic Chemistry

STANNIC OXIDE, SNO2 :

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It is prepared by heating tin strongly in air. Sn + O2 ———> SnO2

 

It can also be prepared by heating metastannic acid obtained by the action of conc. HNO3 on tin.

Sn + 4 HNO3(conc.) ——> H2SnO3 + 4 NO3 + H3O

                     Δ
H2SnO3 ——> SnO3 + H2O

It occurs in nature as tin stone. It is a white solid insoluble in water and is amphoteric in nature. With NaOH it forms Na2SnO3 . It is used for making enamels and glazes for tiles, pottery etc. it is also used as a polishing powder.

 

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