Hi Sanjay,
1. Yes, QNX supports full POSIX process model, so this can be accomplished very easily.
2. Whether the Microkernel/Process Manager (procnto - the actual core of the QNX OS) and the C lib are MISRA compliant 
is a question that the QNX guys would need to answer.
But if you have the requirement of creating an application that is MISRA compliant you will have good chances to achieve
 that because procnto/libc are pre-certified to a number of standards related to safety/security, and your application 
will be contained in a dedicated process that is completely isolated from the rest of the system.

-Al