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You can mount all your RAC instances for a standby database. But only one instance can do recovery.
So answer is yes for your both questions.
1. If I have a RAC physical standby database and instance 1 is mounted and is applying redo, can i mount second instance if I wish for example to perform a backup using rman?Yes as Emre mentioned, you can mount all of the instances in cluster.
2. If instance 1 is mounted and applying redo can I stop it and start instance 2 and continue to apply redo??Redo apply will active only on one node, remaining standby instances will be idle
So you can start recovery any instance where you wish.
Yes. We can start both instances but at one point, only one instance will be applying redo logs.