Which marked atom's lone pair participate in resonance phenomenon

Statement I: Resonating structures of can show geometrical isomerism at room temperature Statement II : lone pair of nitrogen will participate in resonance but only E form is stable in it's resonating structure

In which molecules resonance phenomenon operates-

In which of the following cases lone-pair is involved in resonance :

In which of the following cases lone-pair is involved in resonance :

Which species has lone pair on central atom?

In which of the following lone-pair indicated is involved in resonance:

Which one of the following pairs of structures represent the phenomenon of resonance?

Which one of the following pairs of structures represents the phenomenon of resonance?

Statement-1: And Statement-2: Lone pair electrons on nitrogen in compound (I) does not participate in resonance.