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Oxides of aluminium and zinc are :
A metal is used in thermit process. When this metal is heated with the oxide of a less reactive metal, the oxide formed is amphoteric in nature. The metal and the oxide formed are :
A metal 'X' is used in thermit process. When 'X' is heated with oxygen, it gives an oxide 'Y', which is amphoteric in nature. 'X' and 'Y' respectively are :
A metal is used in thermit process. When its powder is heated with oxide of the metal to be extracted, it gives an oxide which is amphoteric in nature. The metal and its oxide respectively are :
State reasons for the following :
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