"Nem, ez nem alma, hanem szék."
Translation:No, this is not an apple, but a chair.
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The difference is that we don't know how many objects are in question. If you add an article you are defining that it is one apple/chair. If there is no article, it can be plural or singular, and if you want definite plural, you would add suffixes (Nem, ezek nem almák, hanem székek.)
If it's a definite noun (the apple, my car, John's friend), including a or az is necessary.
You use egy mostly only when you want to convey that it's exactly one item you're talking about. (Egy also means 'one' in English.) If the exact number is not of importance, you can leave it out.