[Grammar] on mind vs in mind?

[Ferdie11]

Hi,
Can you tell me the difference if I use in or on before the word mind.

Example:

1. What's on your mind
2. I'll keep that in mind.

Thanks in advance.

 

[5jj]

1. What's [STRIKE]in[/STRIKE] on your mind? What are you thinking about?

2. I'll keep/bear that in [STRIKE]on[/STRIKE] mind.I will not forget that.

Also: What do you have in [STRIKE]on[/STRIKE] mind? What are you considering as a possible plan?