Column I Column II A Light has dual character p de Broglie B Electrons have dual character q Einstein C N has electronic configuration 1 s 2 2 s 2 2 p x 1 2 p y 1 2 p z 1 and 1 s 2 2 s 2 2 p x 2 2 p y 2 r Aufbau D 4 s orbital is filled first than 3 d s Hunds E Basis of Quantum mechanics t Schrodinger

A - q , B - p , C - s , D - r , E - t

A - p , B - q , C - r , D - s , E - t

A - t , B - s , C - r , D - q , E - p

A - r , B - s , C - t , D - p , E - q

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The energy of an electron in the first Bohr orbit of $H$ atom is $- 13.6 eV$ . The possible energy value (s) of the excited state(s) for electron in Bohr orbits of hydrogen is(are)

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Important Questions on Structure of Atom

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11th CBSE

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Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 102

The energy of the electron in the third orbit will be

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 103

The radius of the third orbit of hydrogen atom will be

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 104

The velocity of the electron in the third orbit of hydrogen atom will be

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 105

If the electron absorbs

12.1 eV

of energy, it will jump to the orbit

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 123

	Column I		Column II
A	Light has dual character	p	de Broglie
B	Electrons have dual character	q	Einstein
C	$N$ has electronic configuration $1 s^{2} 2 s^{2} 2 {p_{x}}^{1} 2 {p_{y}}^{1} 2 {p_{z}}^{1}$ and $1 s^{2} 2 s^{2} 2 p_{x}^{2} 2 {p_{y}}^{2}$	r	Aufbau
D	$4 s$ orbital is filled first than $3 d$	s	Hunds
E	Basis of Quantum mechanics	t	Schrodinger

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 126

Column 1	Column 2	Column 3
(I) $1 s$ orbital	(i) $ψ_{n, l_{1}, m_{1}} \propto {(\frac{Z}{a_{0}})}^{3 / 2} e^{- (\frac{Zr}{a_{0}})}$
(II) $2 s$ orbital	(ii) One radial node	(Q) Probability density at nucleus $\propto \frac{1}{a_{0}^{3}}$
(III) $2 p_{z}$ orbital	(iii) $ψ_{n, l, m_{l}} \propto {(\frac{Z}{a_{0}})}^{5 / 2} {re}^{- {(\frac{z}{2 a_{0}})}_{cosθ}}$	(R) Probability density is maximum at nucleus
(IV) $3 d_{z}^{2}$ orbital	(iv) $xy$ -plane is a nodal plane	(S) Energy needed to excite electron from $n = 2$ state to $n = 4$ state is $\frac{27}{32}$ times the energy needed to excite electron from $n = 2$ state to $n = 6$ state

For ${He}^{+}$ ion, the only INCORRECT combination is

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 127

Column 1	Column 2	Column 3
(I) $1 s$ orbital	(i) $ψ_{n, l_{1}, m_{1}} \propto {(\frac{Z}{a_{0}})}^{3 / 2} e^{- (\frac{Zr}{a_{0}})}$
(II) $2 s$ orbital	(ii) One radial node	(Q) Probability density at nucleus $\propto \frac{1}{a_{0}^{3}}$
(III) $2 p_{z}$ orbital	(iii) $ψ_{n, l, m_{l}} \propto {(\frac{Z}{a_{0}})}^{5 / 2} {re}^{- {(\frac{z}{2 a_{0}})}_{cosθ}}$	(R) Probability density is maximum at nucleus
(IV) $3 d_{z}^{2}$ orbital	(iv) $xy$ -plane is a nodal plane	(S) Energy needed to excite electron from $n = 2$ state to $n = 4$ state is $\frac{27}{32}$ times the energy needed to excite electron from $n = 2$ state to $n = 6$ state

For the given orbital in column $I$ , the only CORRECT combination for any hydrogen-like species is

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 128

Column 1	Column 2	Column 3
(I) $1 s$ orbital	(i) $ψ_{n, l_{1}, m_{1}} \propto {(\frac{Z}{a_{0}})}^{3 / 2} e^{- (\frac{zr}{a_{0}})}$	(P)
(II) $2 s$ orbital	(ii) One radial node	(Q) Probability density at nucleus $\propto \frac{1}{a_{0}^{3}}$
(III) $2 p_{z}$ orbital	(iii) $ψ_{n, l, m_{l}} \propto {(\frac{Z}{a_{0}})}^{5 / 2} {re}^{- {(\frac{z}{2 a_{0}})}_{cosθ}}$	(R) Probability density is maximum at nucleus
(IV) $3 d_{z}^{2}$ orbital	(iv) $xy$ -plane is a nodal plane	(S) Energy needed to excite electron from $n = 2$ state to $n = 4$ state is $\frac{27}{32}$ times the energy needed to excite electron from $n = 2$ state to $n = 6$ state

For the hydrogen atom, the only CORRECT combination is

The energy of an electron in the first Bohr orbit of H atom is -13.6 eV. The possible energy value (s) of the excited state(s) for electron in Bohr orbits of hydrogen is(are)

Important Questions on Structure of Atom

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The energy of an electron in the first Bohr orbit of $H$ atom is $- 13.6 eV$ . The possible energy value (s) of the excited state(s) for electron in Bohr orbits of hydrogen is(are)