You should be aware that just because you married a person of other community you can ot get the privileges and rights of the other community spouse.
Your community by birth will remain with you and it is not an automatic conversion.
If you had applied for the post under general category, then what was the necessity for you to furnish the community certificate of your spouse.
Since this is false information, your application for the post may come under scanner and perhaps the consequences for furnishing the false information may render you ineligible for the post you have applied for even though you opted for the reservation under general category.
Whatever worth it is since you have mentioned your community to which your spouse belongs, you can attach the said certificate you rely upon to prove your present community.
If you do not have any certificate to prove that you belong to the community that your spouse belongs then it can be deemed that you have given incorrect or false information with or without any intention, hence you may have to face the consequences for the commission of this offence. ..
Ignorance of law cannot be claimed as an excuse.