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I found in dictionary わけ is a Noun, However, I see in the book that Noun will go with な when using with わけ, as N な + わけがない/わけはない.
Besides わけ, is there any Japanese word that has that exception?
Why has it become like that? And there is any general rule for us to remember? Thanks a lot.
If N is a pure noun such as 学生 or 食べ物, Nのわけがない is the norm in formal settings. Nなわけがない is usually acceptable, but tends to sound colloquial. な is sometimes used also before 理由, こと, 場合, etc. If N is a na-adjective (aka descriptive noun) such as 簡単, simply な should be used. Nだわけがない is always ungrammatical.
See also: 嘘なわけ in this sentence?
