Which of following statement is true. \( \mathrm{P} \) (A) Lanthanum is the first element of lan...

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Which of following statement is true.
\( \mathrm{P} \)
(A) Lanthanum is the first element of lanthanides
W
(B) Actinium violates the Aufbaus principle.
(C) Chromium violates the Paulis-exclusion principle.
(D) Total 10 exchanges are possible for d-electrons in \( \mathrm{Zn} \).
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