13239
In contrast to the commercial Ir black , the collective data confirmed the outstanding activity and stability of the fabricated Ir ( x ) Sn ( 1 - x ) O ( 2 ) ( x = 1 , 0 . 67 and 0 . 52 ) NPs , which could be ascribed to the amorphous structure , good dispersion , high pore volume , solid - solution state and Ir - rich surface for bi - metal oxides , and relatively large size ( 10 - 11 nm ) , while Ir ( 0 . 31 ) Sn ( 0 . 69 ) exhibited poor electro - catalytic activity because of the separated two phases , a SnO ( 2 ) - rich phase and an IrO ( 2 ) - rich phase .
 Chemical: Ir; Chemical: Sn; Chemical: O ( 2 ); Chemical: Ir; Chemical: bi - metal oxides; Chemical: Ir; Chemical: Sn; Chemical: SnO ( 2 ); Chemical: IrO ( 2 )
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Ir, Sn, O ( 2 ), Ir, bi - metal oxides, Ir, Sn, SnO ( 2 ), IrO ( 2 ) 
Answer:
 Chemical: Ir; Chemical: Sn; Chemical: O ( 2 ); Chemical: Ir; Chemical: bi - metal oxides; Chemical: Ir; Chemical: Sn; Chemical: SnO ( 2 ); Chemical: IrO ( 2 )