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Idioms: "account for"

John opened an account _____ the bank.

Nope. Account is used here as a noun and thus is not the idiom account for, which is a phrasal verb. The noun account does not require a specific preposition after it. 

Very good! You were not fooled to think that every time the word account is used it is a part of the idiom account for. You remembered it could also be used as a noun, in which case it doesn't require the preposition for after it.

The correct answer is in. Account is used here as a noun and thus is not the idiom account for, which is a phrasal verb. The noun account does not require a specific preposition after it.

for
in

I don't know