【单选题】现有原电池 (-)Pt|Fe 3+ , Fe 2+ ||Ce 4+ , Ce 3+ |Pt(+),该原电池放电时所发生的反应是( )
A.
Fe 3+ +Ce 3+ = Ce 4+ + Fe 2+
C.
Fe 2+ +Ce 4+ = Ce 3+ + Fe 3+
D.
Fe+2Ce 4+ =2Ce 3+ + Fe 2+
【单选题】现有原电池( - ) Pt │Fe 3+ , Fe 2+ ║Ce 4+ , Ce 3+ │Pt (+) ,该原电池放电时发生的反应为:
A.
Ce 3+ + Fe 3+ = Ce 4+ + Fe 2+
C.
Ce 4+ + Fe 2+ = Ce 3+ + Fe 3+
D.
2Ce 4+ + Fe = 2Ce 3+ + Fe 2+
【单选题】How long is IELTS Reading Test?
【简答题】Are the reading andwriting tests in the IELTS the same?
【判断题】When you practise IELTS reading, always start with intensive reading.
【判断题】The IELTS Academic Reading is exactly the same as the General Training Reading.
【判断题】一般来说,裂缝间距越小,其裂缝开展宽度越大。
【单选题】现有原电池(一) Pt|Fe 3+ ,Fe 2+ ||Ce 4+ ,Ce 3+ | Pt(+), 该原电池放电时所发生的反应是()
A.
Ce 3+ + Fe 3+ = Ce 4+ + Fe 2+
C.
Ce 4+ + Fe 2+ = Ce 3+ + Fe 3+
D.
2Ce 4+ + Fe = 2Ce 3+ + Fe 2+