HONG KONG, March 23 (Reuters) - Baidu Inc shares are set to rise 0.8% and open at HK$254 ($32.71) when they start trading on the Hong Kong Stock Exchange on Tuesday. The Chinese internet giant priced its shares at HK$252 each as part of its secondary listing in Hong Kong which raised $3.1 billion. ($1 = 7.7655 Hong Kong dollars) (Reporting by Donny Kwok; Editing by Christopher Cushing)