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Can the following expression be used to express shock of person's actions or statements:

気が変になったか。

What are the equivalents to "Are you nuts?"

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「気{き}が変{へん}になったか。」 makes sense and it is not bad at all, but that plain か-ending makes it sound a little stiff.

You could say:

「正気{しょうき}で言{い}ってるの?」

「頭{あたま}おかしいんじゃない?」

「気が狂{くる}っちゃったんじゃないの?」

「気は確{たし}か(なの)?」

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I am not sure how much used is 気が変. But I have personally never heard it.

The most accurate expression I can think of now would be :

頭がおかしい

You could also use :

馬鹿{ばか} - 阿呆{あほう}

Which are useful to express shock after someone do something dangerous or stupid.

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