Which sentence is acceptable & why? Who made that mistake? Who did make that mistake?

difference between a general and specific inquiry. Different voice. You made the mistake. You DID make the mistake. both are correct, but the second is assertive and specific. It is used more to contradict a claim to the contrary than to inquire about a general condition. Someone made the mistake-if you did not make the mistake, then who did make the mistake? The mistake was made.

Both make sense, but "Who made that mistake?" would be used more often. "Who did make that mistake" would be used only in certain situations. For example:

Person 1: YOU didn't make that mistake... I didn't make that mistake... Who DID make that mistake?" It would be similar to saying "Then who did?" Therefore, it is more commonly used in specific situations.

They both are acceptable, but one of them is more so.

Who did that mistake?

Both are technically grammatically correct, but no one would say "Who did make that mistake?" It's incredibly formal and it just sounds unnatural. I would stick with "Who made that mistake?"

Both are acceptable. "Who made that mistake" is a simple question, asked when one wants to know who made that mistake and there has been little discussion about who did it.

"Who did make that mistake" is more usual when someone says, "John didn't make that mistake, and I know I didn't either" (or something similar).

"Who did make that mistake" is usual after someone says who *did not* make that mistake.

the first one

THE FORMER IS CORRECT SINCE IT SOUNDS BETTER.