The Bihar School Examination Board (BSEB) conducted the Class 12 Chemistry Exam 2025 today, February 7, 2025, in the first ...

Key fact Three- to four-mark questions usually require longer answers than one- to two-mark questions. The mark schemes given here show some answers as bullet points. This is to show clearly how a ...

You need to use numbers given in the question to work out the answer. When an answer to a maths question is marked: full marks are given for the right answer marks may be given for working ...