Roger Krug Guedes (R) of Al Rayyan SC vies with Merih Demiral of Al Ahli Saudi FC during the AFC Champions League Elite football match between Qatar's Al Rayyan SC and Saudi Arabia's Al Ahli Saudi FC at Ahmad Bin Ali Stadium in Al Rayyan, Qatar, Oct. 21, 2024. (Photo by Nikku/X...
=0.2 mol?L-1,故B正确;C.根据以上分析可知,原溶液中一定存在SO42-、NH4+、Cl-,只是存在Fe3+、Fe2+中的一种,其离子的物质的量为0.02mol,一定不存在CO32-、Al3+;由于第一步中加入了氢氧化钠溶液,引进了钠离子,无法确定原溶液中是否含有钠离子,故C错误;D.检验亚铁离子时,取少量原溶液于试管中,加KSCN...
LHD-450/13 双头铝大拉 (Φ630 气动双盘×2) Dual Al. Wire Drawing Machine Type LHD-450/13 (Dual SpoolerΦ630 x2) 1. Application High-speed al. wire drawing machine Type LHD-450/13 or called rod breakdown machine works to draw Φ9.5mm pure al. rod into Φ1.8mm~Φ4.5mm wire simultan...
解答解:A.Na+、NO3-、Al3+、Cl-之间不反应,都不与强酸性溶液中的氢离子反应,在溶液中能够大量共存,故A正确; B.CO32-与强酸性溶液中的氢离子反应,在溶液中不能大量共存,故B错误; C.Ca2+、SO42-之间反应生成硫酸钙,在溶液中不能大量共存,故C错误; ...
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