I didn't find any questions about this, except for [this
one](https://japanese.stackexchange.com/questions/36877/%E3%81%93%E3%81%A8%E3%81%8B-to-
place-strong-emphasis-on-something), but it's not really the same thing.

I've seen the phrase 「知るか」 a few times in anime and manga before and I've
always interpreted it as "as if I'd know!".

Recently I came across the phrase 「口が裂けても言うものか」. It confused me a bit because
of the conditional that didn't seem to work in a word-for-word translation,
but when I searched it on Google, 「口が裂けても言わない」 showed up as a set phrase that
means essentially "to keep quiet (about something) no matter what".

So I would translate 「口が裂けても言うものか」 to "as if I'd say that/as if that's
something I'd say!". Is that correct?

Finally, I was wondering: is 「知るか」 basically 「知らない」, and 「口が裂けても言うものか」
basically 「口が裂けても言わないもの」, but rude/accusatory? Is it the same for similar
exclamatory phrases?

For example, would 「楽しいことか！」, in contrast to 「なんと楽しいことか！」, mean "this isn't
fun!"?
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grammar translation particle-か rhetorical-questions
「知るか」 and variant phrases
知るか and 口が裂けても言うものか are both Japanese rhetorical questions. The actual meaning
is 知らない ("I don't care", "None of my business") and 口が裂けても言わない ("I won't say
it no matter what"), respectively.

楽しいことか sounds unnatural, but you can form a rhetorical question like
楽しいわけがあるか, 楽しいものか or 楽しいはずがあるか, which actually means 楽しいわけがない ("No way it's
fun"). なんと楽しいことか is something positive like "How fun!".

There may be no syntactical difference between Japanese normal questions and
rhetorical questions. For example 行くか can be a normal question ("Are you
going?", "Should we go now?") or a rhetorical question ("Who goes?", "How come
I have to go?") depending on the context. Still, some expressions like ～ものか,
～もんか, ～わけがあるか, ～はずがあるか, ～なんてことがあるか, ～かよ and so on are almost always associated
with rhetorical questions, so you can assume the actual implication is the
opposite. These are always emphatic, but not necessarily offending or
accusatory.
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