Question

Consider the following statements (A) Ground state electronic configuration of Cr is \([Ar]\,4s^1 3d^5\)
(B) Size of \(2p_x\) orbital is smaller than \(3p_y\)
(C) Heisenberg uncertainty principle is applicable only for electron.
(D) (Energy of \(2s\))$_{Hydrogen}$ = (Energy of \(2s\))$_{Lithium}$
The correct statements are

• A. A \& C
• B. B \& D
• C. A \& B
• D. C \& D

Answer 1

The Correct Option is C

Concept:
Atomic structure concepts include electronic configuration, orbital size, uncertainty principle, and energy dependence on atomic number. Step 1: Check each statement. (A) True — Cr has configuration \([Ar]\,4s^1 3d^5\).
(B) True — \(3p\) orbital is larger than \(2p\).
(C) False — Uncertainty principle applies to all microscopic particles.
(D) False — Energy depends on atomic number. Step 2: Select correct statements. \[ \boxed{A \text{ and } B} \]