This SQL statement will show all the permissions of a particular role:
use YourDBName
go
select dp.NAME AS principal_name,dp.type_desc AS principal_type_desc,
o.NAME AS object_name,p.permission_name,p.state_desc AS permission_state_desc
from sys.database_permissions p
left OUTER JOIN sys.all_objects o
on p.major_id = o.OBJECT_ID
inner JOIN sys.database_principals dp
on p.grantee_principal_id = dp.principal_id
where dp.NAME=’YourDBRoleName’
Thanks to Mike Warner