2020 100
1
(1) B ____________________________
(2) A ___________________________________
(3) C
________________________________
(4) A
(i) __________________
(ii) __________________________
a
b
c
d
e 30 s
(iii) A _______
2 H2SO
4 IO
2
1 c(H +)
10mL 1mol L 1 KI 5
10mL
10mL 0.1mol L 1H2SO
4 3min
10mL 0.2mol L 1H2SO
4 1min
