Directions: In the following question, there are two statements labelled as Assertion (A) and Reason (R). Mark your answer as : (a) if both A and R are true and R is the correct explanation of A. (b) if both A and R are true but R is not the correct explanation of A. (c) if A is true but R is false. (d) if A is false but R is true. (e) if both A and R are false. Assertion: Electronic configuration of Cr⁺³ (containing 21 electrons) is same as that of Sc (atomic number = 21), i.e. isoelectronic species have the same electronic configuration. Reason: Orbitals are filled in order of increasing energy and also this filling follows pauli’s exclusion principle and hund rule.