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Structure of Atom question bank (Chemistry)

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Q1.

The extra stability of half-filled subshell is due to
(A) Symmetrical distribution of electrons
(B) Smaller coulombic repulsion energy
(C) The presence of electrons with the same spin in non-degenerate orbitals
(D) Larger exchange energy
(E) Relatively smaller shielding of electrons by one another
Identify the correct statements

(A)

(B), (D) and (E) only

(B)

$(\mathrm{A}),(\mathrm{B}),(\mathrm{D})$ and (E) only

(C)

(B), (C) and (D) only

(D)

(A), (B) and (D) only

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Q2.

Which one of the following about an electron occupying the 1 s orbital in a hydrogen atom is incorrect ? (Bohr's radius is represented by a $a_0$)

(A)

The probability density of finding the electron is maximum at the nucleus

(B)

The electron can be found at a distance $2 \mathrm{a}_0$ from the nucleus

(C)

The 1 s orbital is spherically symmetrical

(D)

The total energy of the electron is maximum when it is at a distance $a_0$ from the nucleus

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