The common household base compound formed from nitrogen and hydrogen is ammonia (NH3).

Here's why:

* Base: Ammonia is a weak base, meaning it can accept protons (H+) in solution.

* Household use: Ammonia is commonly found in cleaning products, such as window cleaners and all-purpose cleaners. It's also used in some fertilizers.

* Formation: It's formed by combining nitrogen (N2) and hydrogen (H2) gas under specific conditions.

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