想問chem

碧咸

A.         Both statements are true and the 2nd statement is a correct explanation of the 1st statement.
B.         Both  statements  are  true  but  the  2nd  statement  is  NOT  a  correct  explanation  of  the  1st statement.
C.         The 1st statement is false but the 2nd statement is true.
D.         Both statements are false.
Sulphur dioxide is an oxidizing agent.        Sulphur dioxide can decolorize bromine water.
大家認為係咩答案?

細薯

sulphur dioxide SO2-->SO4 2-
It oxidize from o.n. +4 to o.n. +6
It is a reducing agent.
First statement is wrong.

sulphur dioxide can decolorize bromine water.
It is due to the reducing properties of aqueous sulphur dioxide.
SO2(aq) + 2 H2O(l) + Br2(aq) --> SO4 2-(aq) + 4 H+(aq) + 2Br-(aq)
Second statement is true.

Answer is C.

[ 本帖最後由 smallpotato226 於 2006-1-22 09:53 PM 編輯 ]

碧咸

我都係咁諗
但可惜答案係B
請問係點解

流映

可能係因為SO2可以變返S
但係好似無咩機會

細薯

原帖由 流映 於 2006-1-24 09:08 PM 發表
可能係因為SO2可以變返S
但係好似無咩機會

我同學話佢睇到past paper
原來SO2可以變返S ga