Can anyone please tell me how to retrieve chromosome location for a set of gene id

It's a two-step process.

egids <- select(<ChipDb package goes here>, keys(<ChipDb>), "ENTREZID")

chrlocs <- select(<OrganismDb or TxDb package>, as.character(egids[,2]), c("CDSCHROM","CDSSTART","CDSEND"), "ENTREZID")

You will have to figure out what ChipDb and OrganismDb or TxDb package you need, because you are being unnecessarily mysterious about what you are doing. Asking vague questions will either get you a vague answer, or none at all, so in future you should try to be more specific.