27£®³ø·¿Àï·¢ÉúµÄÏÂÁб仯ÖУ¬ÊôÓÚÎïÀí±ä»¯µÄÊÇ

A£®ÌìÈ»ÆøȼÉÕ                       B£®Ìú¹øÉúÐâ

C£®¿ªË®·ÐÌÚ                         D£®Ê³Îï±äÖÊ

28£®ÎïÖʵķÖÀà·½·¨Óкܶ࣬ÒÔÏÂÊôÓÚ´¿¾»ÎïµÄÊÇ

A£®´¿¼î                             B£®´ÖÑÎ

C£®ÆûË®                             D£®¿ÕÆø

29£®ÓÃI₂O₅ ²â¿ÕÆøÊÜCOÎÛȾµÄ³Ì¶Èʱ£¬·¢ÉúÈçÏ·´Ó¦ I₂O₅ + 5CO → I₂+ 5CO₂¡£¸Ã»¯Ñ§·´Ó¦ÖÐÑõ»¯¼ÁÊÇ

A£®I₂O₅                              B£®CO

C£®I₂                                D£®CO₂

30£®îÑÌú¿óÖ÷Òª³É·ÖµÄ»¯Ñ§Ê½ÎªFeTiO₃£¬ÆäÖÐÌúÔªËØÏÔ+3¼Û£¬ÔòTi»¯ºÏ¼ÛΪ

A£®+2                               B£®+3

C£®+4                               D£®+6