Chem 問題麻煩幫幫忙~

用戶232297

2008-04-06 1:06 am

1. When substance X is treated with an aqueous solution of iron(Ⅱ) sulphate, the iron(Ⅱ) ions act as oxidizing agent. X may be
A.Concentrated HCl
B.aqueous ammonia
C.acidified potassium dichromate solution
D.Zinc granules
答案係D，但係點解呢？
請詳細解釋！

2. The reaction between H2O2(aq) and Cr(OH)4^ - (aq) in alkaline solution to give CrO4 ^2- (aq).
Write a balanced equation.
詳列寫Equation既steps…

3. The colour of iodine water and bromine water？
Their state in room temperature？

THX！

回答 (1)

用戶7369

2008-04-06 1:55 am

✔ 最佳答案

1. Zinc is higher than iron in the metal reactivity series.
so zinc will displace iron ii ion to form zinc ion and iron
metal is formed.
2. 2OH- +3H2O2 + 2Cr(OH)4- --------> 8H2O + 2CrO4^2-
3. iodine water is brown and bromine water is orange.
in room temperature, iodine is a solid and bromine is a liquid.

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Chem 問題 麻煩幫幫忙~

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Chem 問題麻煩幫幫忙~