1. As far as I know, wife belonging to general caste does not get the reservation facilities given to a SC employee if her husband belongs to SC category,
2. I have not heard about any concession given to anybody while being appointed for the reason that her husband belongs to SC category,
3. However, if you have been appointed under SC category based on the said circular, place it before your authority explaining him that you belong to general category but were recruited under SC category as per the said circular.