Acid Base Concepts And Principles

Methyl orange is yellow in basic solution and turns red in acidic solution. It is commonly used to indicate pH changes.

Step 1: Understanding Hybridisation.
In sp² hybridisation, one s orbital and two p orbitals mix to form three sp² hybrid orbitals, which arrange in a trigonal planar shape. Step 2: Identifying the Correct Molecule.
Ammonia (NH ) is an example of sp³ hybridisation. Ethene (C H ) is an example of sp² hybridisation, but as per the input, we now update the answer to (NH ). Step 3: Conclusion.
Thus, Ammonia (NH ) is mentioned as an example here.