HELP ~chem要攞A ge入黎答=3333333333333333333=
HKCEE 1996 Q2121. Which of thefollowing statements concerning chlorine isINCORRECT?
A. It can kill germs.
B. It can turn bromine water colorless.
C. It can oxidize iodide ions to iodine molecules.
D. It can be produced by the reaction between dilute sulphuric acid and sodium hypochlorite solution.
ans is B
but i wonder how D work???? H++ OCl- + Cl - --> Cl2 + H2O 原帖由 piyopiyo 於 10-4-2008 20:58 發表 http://www2.nakuz.com/bbs/images/common/back.gif
H++ OCl- + Cl - --> Cl2 + H2O
where is the Cl- from- -??? only NaClO given 原帖由 samson2020 於 10-4-2008 20:59 發表 http://www.nakuz.com/bbs/images/common/back.gif
where is the Cl- from- -??? only NaClO given
oops,made a mistake,,,then it should be
4H+ + 2OCl---> 2Cl2 + 2H2O... 原帖由 piyopiyo 於 10-4-2008 21:01 發表 http://www1.nakuz.com/bbs/images/common/back.gif
oops,made a mistake,,,then it should be
4H+ + 2OCl---> 2Cl2 + 2H2O...
@_@你條式系邊度睇番來? 原帖由 samson2020 於 10-4-2008 13:28 發表 http://www1.nakuz.com/bbs/images/common/back.gif
@_@你條式系邊度睇番來?
you can know, but not necessary... 原帖由 samson2020 於 10-4-2008 21:28 發表 http://www.nakuz.com/bbs/images/common/back.gif
@_@你條式系邊度睇番來?
錯的[]
OCl- 的Cl ON 是 +1 ... []
4H+ + 2OCl- -->Cl2 + 2H2O ,,,charge唔balance, 突左2粒2H+出泥,要有第2d野收 e-...
應該唔會係咁掛
2H+ + 2e- --> H2...
6H+ + 2OCl2 ---> Cl2 + 2H2O + H2 []
真係一味靠估,是否out c 的[]
[ 本帖最後由 piyopiyo 於 10-4-2008 21:47 編輯 ] I think B and D are both incorrect, but B is more incorrect. 你可以話係因為 OCl- 會 decompose 做 Cl- 同 O2...
上一上維基, be right back D係岩架∼會出ＣＬ２（Ｇ）
而Ｂ因為ＣＬ較溴強既氧化劑∼所以唔可以比電子溴∼溴唔可以變離子∼所以無得變無色∼
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