Why is it not 그릇 안에 뭐예요?
Why is 그릇에 뭐 있어요 incorrect?
What's wrong with 그릇에 무엇입니까?
Difference between 접시 and 그릇 https://hinative.com/en-US/questions/2585599
Why not 있읍니까?
"있습니까?" would be a correct alternative.
I think you can turn any sentence into a question by adding a question mark but I think the 있음니까 ending for questions is more polite
I was thinking of 그릇에 뭐가 있어요. 안 돼요?
Yea, it'd be correct
What is the difference between
그릇에 무것은 있어요?
그릇에 무엇이 있어요?
It's not accepting 뭐 instead of 무엇
Can it not be 그릇에 무슨 있어요? Can we not use 무슨 here?