Which sentence is correct?
In general it has to be questioned [...].
In general it is to be questioned [...].
I am not sure which is correct, but I think "it has to be" is correct.
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'has to' is used when there is a compulsion, say a threat or an order or a non-negotiable task.
Example- Say, your friend asks you to come with him and you deny by saying-'No, I am to go to pick my nephew from school.' He would say- 'But your brother too can go and pick him, you please come with me, it's urgent.' You agree and call your brother to inform about the situation.
Case2: You deny your friend by saying,'I have to go to pick my nephew as my brother is out of town.' Your friend understands and leave.
Now depending on the context of your question, both 'has to' and 'is to' can be applied.