qqp question1: I am green card holder My minor children are living abroad I have applied for their green card I don't want to leave them alone and stay in USA? question2: How does [math]KI[/math] replace [math]Cl[/math] in [math]PbCl_2[/math] in the reaction: [math]PbCl_2 + KI \to PbI_2 + KCl[/math]?