Column I shows partial electronic configuration of an atom which may (or) may not be correct. Select the rule(s) they violate from column-II
Column-I Column-II
A)
p) Paul’s exclusion principle
B)
q) Hund’s rule
C)
r) Aufbau principle
D)
s) No violation

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$a \to s, b \to q r, c \to p q r, d \to p q$

$a \to pqr, b \to pr, c \to p , d \to pr$

$a \to s,b \to pr, c \to pqr, d \to rs$

$a \to qrs, b \to p, c \to rs, d \to ps$

answer is A.

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Detailed Solution

lower energy sub shell should be completely filled before electron enters into higher energy according to Aufbau's principle

there should be maximum number of unpaired electrons in the subshell before pairing occurs according to hund's rule of maximum multiplicity

no orbital should have two electrons with parallel or antiparallel spins according to pauli's exclusion principle

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