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> 用重铬酸钾检验发酵液中是否有酒精生成,正确的操作为[]A.先在试管中加入发酵液2mL,再滴加3滴重铬酸钾溶液B.直接将2mL重铬酸钾倒入发酵液中C.先在试管中加入发酵液2mL,再加-高二生物
用重铬酸钾检验发酵液中是否有酒精生成,正确的操作为[]A.先在试管中加入发酵液2mL,再滴加3滴重铬酸钾溶液B.直接将2mL重铬酸钾倒入发酵液中C.先在试管中加入发酵液2mL,再加-高二生物
题目简介
用重铬酸钾检验发酵液中是否有酒精生成,正确的操作为[]A.先在试管中加入发酵液2mL,再滴加3滴重铬酸钾溶液B.直接将2mL重铬酸钾倒入发酵液中C.先在试管中加入发酵液2mL,再加-高二生物
题目详情
用重铬酸钾检验发酵液中是否有酒精生成,正确的操作为
[ ]
A.先在试管中加入发酵液2mL,再滴加3滴重铬酸钾溶液
B.直接将2mL重铬酸钾倒入发酵液中
C.先在试管中加入发酵液2mL,再加入3mol×L
-1
的H
2
SO
4
3滴,摇匀,再滴加常温下饱和的重铬酸钾溶液3滴
D.用试管取2mL发酵液放在酒精灯上加热,待温度降至常温时,再往里面加入3滴mol×L
-1
的H
2
SO
4
,摇匀后,再加入3滴常温下饱和的重铬酸钾溶液
题型:单选题
难度:中档
来源:河北省期中题
答案
C
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题目简介
用重铬酸钾检验发酵液中是否有酒精生成,正确的操作为[]A.先在试管中加入发酵液2mL,再滴加3滴重铬酸钾溶液B.直接将2mL重铬酸钾倒入发酵液中C.先在试管中加入发酵液2mL,再加-高二生物
题目详情
B.直接将2mL重铬酸钾倒入发酵液中
C.先在试管中加入发酵液2mL,再加入3mol×L-1的H2SO43滴,摇匀,再滴加常温下饱和的重铬酸钾溶液3滴
D.用试管取2mL发酵液放在酒精灯上加热,待温度降至常温时,再往里面加入3滴mol×L-1的H2SO4,摇匀后,再加入3滴常温下饱和的重铬酸钾溶液
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