Learn Dutch: Welke aanvraag dan ook wordt afgehandeld. - Any request whatsoever is handled.

In Dutch, you can create a phrase meaning "any X whatsoever" or "no matter which X" by wrapping a noun between a question word like welke (which) and dan ook. Here, welke aanvraag dan ook translates to "any request whatsoever."

Is Welke aanvraag dan ook considered a single unit for word order here?

Yes, the entire phrase Welke aanvraag dan ook occupies the first position in the sentence. Because of the Dutch verb-second (V2) rule, the conjugated verb wordt must come immediately after this whole block.

Why is it welke instead of welk?

The noun aanvraag (request or application) is a de-word (de aanvraag). Because of this, the interrogative pronoun needs the -e ending. If it were a het-word, like probleem, you would use welk probleem dan ook.

Why does the sentence use wordt instead of is for "is handled"?

This sentence uses the Dutch passive voice to describe a standard procedure, which requires the verb worden plus a past participle (afgehandeld). If you used is afgehandeld, it would change the meaning to the present perfect, meaning the request has already been handled.