(1)Si ;Ar (2)K; F (3)A1;2A1( OH)3 +3H2SO4 === Al2( SO4)3 +6H2O,Al( OH)3 +KOH === KA1O2 +2H2O或Al(OH)3+KOH === KAl( OH)4(4)将氯水加入溴化钠溶液中,有红棕色的Br2生成,证明单质氯比单质溴氧化性强。(其他合理答案均给分)
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