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Topic: Identifying false formula...  (Read 1927 times)

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Offline schafer

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Identifying false formula...
« on: April 26, 2014, 11:04:53 AM »
Hey,
I'm preparing for a test, and I keep getting stuck on questions where I need to identify the incorrect chemical formula.
Here is an example of such question:

Which one of the following formulas is NOT correct?
CsNO3
GaCO3
Ba(HCO3)2
BeSO4
SnS2

At first I tried checking the oxidation numbers, but it didn't do the trick...

How do you solve such questions?
Thanks
« Last Edit: April 26, 2014, 11:44:11 AM by schafer »
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Offline Hunter2

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Re: Identifying false formula...
« Reply #1 on: April 26, 2014, 12:18:32 PM »
Check the anions and their charge. Look up the cations in which group they are in PSE. Compare the charges , oxidation number.

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Offline Big-Daddy

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Re: Identifying false formula...
« Reply #2 on: April 26, 2014, 01:43:16 PM »
The oxidation numbers in CO32- will be the same as in GaCO3. With that in mind, you find an oxidation number of +2 for Ga inevitably, as the other group has -2. And where is Ga in the periodic table?
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