Google Chrome opens two tabs when opened
Type this on the address bar chrome://settings & enter where chrome will take you to the settings panel. Fine On start-up & select Open a specific page or set of pages, then click set pages link. There you can remove the extra tab from there. See below image for reference.
Go to Settings -> On startup section -> Open a specific page or set of pages and hit "Set pages".
Remove the one you do not need.