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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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Important Questions on Structure of Atom

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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

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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

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Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 138

The maximum number of electrons that can have principal quantum number,

n = 3

, and spin quantum number,

m_{s} = - \frac{1}{2}

, is

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Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 139

The atomic masses of

' He' and' Ne'

are

4 and 20 a . m . u

. respectively. The value of the de Broglie wavelength of

' He' gas at - 73 ° C is " M "

times that of the de Broglie wavelength of

' Ne' at 727 ° C .' M'

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Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 140

In an atom, the total number of electrons having quantum numbers,

n = 4, | m_{l} | = 1 and m_{s} = - 1 / 2 is

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Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 141

Not considering the electronic spin, the degeneracy of the second excited state of

H^{-}

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 2 - Structure of Atom>Competition Focus>Q 142

For the following question, enter the correct numerical value, (in decimal-notation, truncated/rounded-off to the second decimal place,

e . g ., 6.25, 7.00, - 0 \cdot 33, 30 \cdot 27, - 127 \cdot 30)

using the mouse and the onscreen virtual numeric keypad in the place designated to enter the answer.
The atomic spectrum of hydrogen is found to contain a series of lines of wavelengths

656.46, 486 \cdot 27, 434.17 and 410 \cdot 29 nm

. The wavelength (in nm) of the next line in the series will be _____.

Important Questions on Structure of Atom

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