Nine ministers from the previous Cabinet, including some considered as loyalists of outgoing Chief Minister Anandiben Patel, have been dropped.
Governor O P Kohli administered the oath of office and secrecy to 60-year-old Rupani and Patel.
Eight Cabinet-rank ministers, including Nitin Patel, and 16 Ministers of State were also sworn-in. The total size of the Council of Ministers, including the Chief Minister and Deputy CM now stands at 25.
The oath-taking ceremony was held in the presence of top BJP leaders including its president Amit Shah, party veteran L K Advani, Union Finance Minister Arun Jaitley and Union Science and Technology Minister Harsh Vardhan.
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Former Minister of State for Home Rajnibhai Patel and Women and Child Development Minister Vasuben Trivedi, considered as loyals of the outgoing Chief Minister Anandiben Patel, have been dropped from the new Cabinet.
The others who were dropped from Rupani's Cabinet include Finance Minister Saurabh Patel, Social Justice and Empowerment Minister Ramanlal Vora and MoS for Science and Technology Govind Patel.
On August 3, Anandiben Patel had submitted her resignation to Governor, after the party's parliamentary board in Delhi accepted her offer to quit the post.
The eight inducted Cabinet ministers are Nitin Patel,
Bhupendrasinh Chudasama, Ganpat Vasava, Babu Bokhiria, Dilip Thakor, Jayesh Radadiya, Chiman Saparaia and Atmaram Parmar.
Among these, Chudasama and Bokhiria served as Cabinet ministers in the Anandiben Patel-led government, while Thakor and Radadiya have been elevated from the rank of MoS to Cabinet minister.
Vasava was the Speaker in the state Assembly, while Parmar was the Deputy Speaker.
Those who have been dropped from the Cabinet are Finance Minister Saurabh Patel, Forest and Environment Minister Mangubhai Patel and Social Justice and Empowerment Minister Ramanlal Vora.
Besides, Rajnibhai Patel, Vasuben Trivedi, Chhatrasinh Mori, Govind Patel, Tarachand Chheda and Kantibhai Gamit have also been shown the door.
Those retained from previous ministry include Shanker Chaudhary, Pradeepsinh Jadeja, Jayanti Kavadiya, Nanubhai Vanani, Parshottam Solanki, Jasa Barad, Bachu Khabad and Jaydrathsinh Parmar.
The eight new faces are - Ishwarsinh Patel, Vallabh Kakadiya, Rajendra Trivedi, Keshaji Chauhan, Rohit Patel, Vallabh Vaghasiya, Nirmala Wadhwani and Shabdsharan Tadvi.