French language Q&A Forum

How do I know when to use lequel versus quel

You write that all continents are feminine in French, but Antarctica (l'Antarctique) is masculine I think? 

In the above question, the answer in the test shows “lui” but shouldn’t it be l’ since the verb starts with vowel?

I came here after missing a question that used "nulle parte" instead of "nulle part".  Is there some agreement of "parte" that I'm missing?

"...vous pourrez programmer votre combinaison personnelle quand vous arriverez ici." (recommended answer)

"...vous pourrez programmer votre combinaison personnelle quand vous serez arrivés ici." (marked incorrect)

While I do realize that the construction is covered at a higher level than this writing exercise, I was curious if the second sentence is grammatically or situationally incorrect? Or maybe just not preferred?

Merci!

One of the answers given I think was written with "que l'on" rather than "qu'on", i.e.
si vous ne voulez pas que l'on parte plus tôt.

Are both correct. If so can you please explain the use of l' . I don't understand why we would use l' here.

Bonjour — do you not use the liaison after “vais”? Is it optional or forbidden? Merci.

Using le gerondif seems simpler that using a more complex construction using qui. For instance: 

People don't eat the produce coming from farmers using pesticides. (Les gens ne mangent pas les produits des agriculteurs utilisant des pesticides)

People don't eat the produce coming from farmers that use pesticides. (Les gens ne mangent pas les produits des agriculteurs qui utilisent des pesticides)

Is there a preference?