1)
Which Chukim and Mishpatim is the Torah referring to?
1.
Ramban, Seforno and Moshav Zekenim: 'Chukim' pertains to the Chukim of Sh'mitah and Yovel, and 'Mishpatim', to the Dinim of buying and selling that are connected with it.
2.
Oznayim la'Torah: 'Chukim' pertains to the prohibition against tilling the land in Sh'mitah and Yovel ? which are Bein Adam la'Makom, and 'Mishpatim', to declaring Hefker one's fields and vineyards in the Sh'mitah and the Yovel, leaving the land fallow and releasing one's Avadim Ivrim ? which are Bein Adam la'Chavero. 1
1
See Oznayim la'Torah who elaborates..
2)
Why does the Torah insert the phrase "Viyeshavtem al ha'Aretz la'Vetach" here?