Final answer:
The approximate bond angles in the given molecules/ions are 107°, 119°, 180°, and 109.5°.
Step-by-step explanation:
The approximate bond angles in the given molecules/ions are:
x: NCl3 - The bond angle is approximately 107°.
y: SeO2 - The bond angle is approximately 119°.
z: CO2 - The bond angle is 180° as it is a linear molecule.
w: NH4+ - The bond angles are approximately 109.5° as it follows a tetrahedral geometry.