Questions & Answers about In jedem Zimmer steht ein Stuhl.
Because in here takes the dative case (it describes a location, not movement), and Zimmer is neuter singular.
The determiner jeder (= every) is declined:
- Neuter singular:
- Nominative: jedes Zimmer
- Accusative: jedes Zimmer
- Dative: jedem Zimmer
So in the dative, neuter → jedem.
That’s why it must be in jedem Zimmer.
The preposition in can take dative or accusative, depending on the meaning:
- Dative: location (where something is) → static position
- In jedem Zimmer steht ein Stuhl. = A chair is standing in every room. (Where?)
- Accusative: direction (where something is going) → movement into
- In jedes Zimmer bringt er einen Stuhl. = He brings a chair into every room. (Where to?)
In your sentence, the chair is simply located in the room, not moving into it, so dative (jedem) is required.