In an experiment , a copper plate and a zinc plate a placed in a beaker which containing dil. sulphuric acid. The two metal plate are touching reach other.
which of the following are correctly describes ?
a) the solution in the beaker turns blue
b) the mass of the zinc remains unchange
c) white ppt is formed
d) gas bubbles are formed on the Cu surface.
the ans is D .. can anyone tell me why ?
我本身揀左 a ... 因為我諗 H2SO4 會同 Zn react...
之後 zinc ion 就會 displace Cu ...
06 ce Q33
2008-03-30 11:15 am
回答 (1)
2008-03-30 4:53 pm
✔ 最佳答案
zinc and copper act as electrode.zinc lose electron to copper electrode.
H+ accept the electron to form hydrogen atom
and then form hydrogen molecules
therefore D is the answer.
收錄日期: 2021-04-29 20:24:43
原文連結 [永久失效]:
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