CBSE Class 12th Chemistry Answer Key 2018,CBSE Class 12 board exams 2018.With the CBSE Class 12,CBSE Class 12 Chemistry Board Exam 2018, CBSE Class XII Chemistry .CBSE Sample Question Paper for Class 12th Board Exam 2017 – 2018 CBSE 12th Chemistry Answer Key 13~March, 2018 Ques~Paper Solved. Intermediate (12th class) annual exam CBSE 12th Board exam already start and as per schedule Chemistry subject exam scheduled on 13th March 2018