Can tasks be marked as blocked during a sprint?

Sometimes while the sprint is running, we face a situation in which tasks become interdependent i.e. a particular task can only be completed after another developer completes his/her task. We implement Scrum manually using a Scrum board. I want to know how do I mark tasks as blocked on the board? Do I need to maintain a separate column titled "Blocked" next to "In Progress"?

Posted By - Ivan