if it was not a pass back then he's allowed
Only inside the box.
yes he can. as a goalkeeper you dont give up on goal never ever!
yes he/she can for example if the goalkeeper is going to kick the ball and puts it down he/she can pick it up and move it somewhere else.
Only if it was thrown-in by the opponents, not from a team-mate.
This would depend on how the goal keeper received it in the first place. If it was kicked or thrown-in to them directly from a team-mate then they cannot pick it up. Otherwise, it is allowed.
It depends on how the goalkeeper received it. If the goalkeeper received it from a deliberate kick or a throw-in by a team-mate, then no. Otherwise, yes.
A goal keeper may pick up a ball directly from a throw-in by an opponent.A goal keeper may not pick up a ball directly from a throw-in by a teammate. This is one of the Indirect Free Kick infractions.
Yes it can be done, as it is not a back pass.
No, a keeper may not pick the ball up on a pass back. If they do so, an indirect free kick is awarded to the opposing team.
If a defender passes the ball back to his own goalkeeper using his feet then the keeper cannot pick it up, he can only use his feet to clear or pass the ball. however if the defender passes the ball back to his keeper using another part of his body (excluding arms and hands) then the goalkeeper can pick it up.
No, the only place a goalkeeper may handle the ball is in his own penalty area.