4

Was für ein Mumpitz!

I'm not sure why you need to use "ein" here, as "Mumpitz" is a masculin noun and the preposition "für" should be followed by the accusative form "einen".

7

You are right "Mumpitz" is masculin. But you misinterpret the structure. It's not that something is done for the Mumpitz, or something similar.

Was für ein Mumpitz

is short for

Was ist das für ein Mumpitz

so here "was für ein" is synonmym to "welche Art", "welch ein" and that's why Mumpitz is in nominative case here.

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