A1) The Monday will be the replacement off day. If your company request you to work, it will be a double paid. But some company (stingy company), they will give you another replacement day or add 1 AL to you instead of giving double paid.
A2) It is same with your Q1, the following day will be replace. But if your company declare that the Hari Raya not their company gazetted public holiday, then it is different story.
The 5 compulsory gazetted public holiday for 2011 is:-
B'day of Sultan or Head of State or Federal Territory day
And the remaining 6 is decided by your company. Note that some company may give more than 11 public holiday.
Try to check with your HR department whether Hari Raya is gazetted holiday or not.