2007-05-22 06:39:41 · 4 answers · asked by camphaign 1 in Science & Mathematics ➔ Chemistry
well compund is correclty written.well its an IIT JEE question lets see who answers
2007-05-22 06:53:30 · update #1
The formula is indeed CrO5. It forms a lovely blue solution in water, which decomposes in a short time to a muddy brown mix of Cr3+ and CrO4=. It is made by reaction of Na2Cr2O7(aq) or K2Cr2O7(aq) with hydrogen peroxide, H2O2.
So it's perfectly logical to argue that Cr must be 10+, because that's how it comes out when you apply the rules. But it's also apparent that two of the O's may be -O-O-, so that some O's are 2- and some are 1-. That means that Cr is <10+.
By the way, you can get the compound and the lovely color to hang around "indefinitely" if you do it in pure acetic acid.
2007-05-22 08:38:18 · answer #1 · answered by steve_geo1 7 · 0⤊ 0⤋
You just have to do a little math. The H2O molecules don't count since they have neutral charge, so we'll ignore them. We know that each chlorine has a -1 charge, and that the overall charge of the whole ion has to be +1. That means we can write the equation: x - 2 = 1 This just says that the charge of the chromium plus the charge of the two chlorines (-2) has to be equal to +1. When we solve the equaation, we get x = 3.
2016-05-20 01:09:33 · answer #2 · answered by ? 3 · 0⤊ 0⤋
A couple of things. First, when dealing with chemical symbols, you have to use upper case and lower case letters correctly. Chromium is Cr.
Second there is no compound with the formula CrO5. Did you type it in correctly?
2007-05-22 06:44:36 · answer #3 · answered by hcbiochem 7 · 0⤊ 0⤋
If this compound could exist it would be +10 the oxidation number of Chrome.
2007-05-22 06:55:04 · answer #4 · answered by mimi 3 · 0⤊ 0⤋