IMAT 2015 Q51-Chemistry question

Hey! I’m having trouble with this question. The answer is E (CO and NO)
SO2 + H2O will lead to an acid solution, since H2SO3 will be created (sulfuric acid)
but what about CO2? I though it wouldnt be too acidic since H2CO3 is created (carbonic acid-weak acid)
And NO + H2O-> HNO2 (what’s this? :sneezing_face:)
I will be eternally grateful to the person who replies this because I always struggle with this kind of chem questions (salts-acidity/alkalinity of solutions).
Thank you so much in advance :low_brightness:


1 Like

The general rule you can remember while solving these types of question (it works almost all the times except some cases can’t do anything it’s chemistry haha) the metal oxides are basic in nature(exc. Al :- amphoteric) while the non-metal oxides are acidic the reason they are acidic as non-metallic oxides mix with water, it forms an oxyacid ions which are electronegative and readily dissociates to give hydrogen ions this general rule works almost all the times but here CO and NO forms neutral solution this is something you can put up to your memory as it’s a general exception to the trend.
Does this help??


Thank you for your time ! :ok_woman: By any chance are there any other exceptions to these rules? Or NO and CO are the only exceptions?

Under Non-metals we can have : N2O(nitrous oxide), NO and CO.
in general H20, Manganese (IV) oxide (MnO2) and H2O2 also forms neutral oxides.
Hope it helps:)

1 Like


I have a few notes about the acidic, basic and amphoteric oxides that might help:)


Thank you so much Darius, this is really helpful :ok_woman::low_brightness:

1 Like