The oxidation state is a direct measure of the number of valence electrons in the outer shell of an atom. Every atom wants its outer shell to be a complete 8. If it has fewer electrons, it tends to give them away and acquires a positive oxidation state.
If it has more electrons it tends to gain a few more electrons to complete its outer shell and acquires a negative oxidation state. Chromium has an oxidation state of +6. This is because oxygen, with an oxidation state of -2, can attach to the atom three times in the chromium oxide compound.
Option E is correct.
In the above question, hydrogen peroxide is behaving as a reducing agent. Hydrogen peroxide is reducing silver from an oxidized state to a reduced state. Oxygen is been removed from silver.
In the reaction, oxygen is formed in it's pure state and hydrogen peroxide is been oxidized to form water. This chemical reaction represents an example of a Redox reaction, as one element is oxidized another is reduced. This reaction is very important in the formation of pure silver. Hydrogen peroxide is not acting as an acid, a catalyst, a dehydrating agent or an oxidizing agent in the reaction above.
The correct answer is lettered D. Ethanol becomes a reducing agent when makes it contact with acidified potassium dichromate (VI). Alcoholic beverages contain ethanol that makes people drunk when consumed beyond the limit. Driving under the influence of alcohol is prohibited by law as the life of the driver, and the civilians could be in great danger.
That is why police officers use an alcohol test to drivers are suspicious in drunk driving. They use a solution containing acidified potassium dichromate (VI) that when a (drunk) driver breathes into it, it will turn green from an orange color. It shows that the ethanol reduced the number dichromate (VI) ions to chromium (III) ions indicating a large amount of ethanol is present.
I put my answe in as Gol D Roger and it said Iwas wrong, and I'm offended