Which of the following statements is $CORRECT$?

  • A
    Out of four quantum numbers,the azimuthal quantum number may have the highest numerical value for a particular subshell.
  • B
    On increasing electronegativity,ionisation energy decreases generally.
  • C
    If the intermolecular axis is $x$-axis,then $d_{xy}$ will form a pi $(\pi)$ bond with $p_x$ orbital.
  • D
    None of these

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Match the following items:
$A$. Energy of ground state of $He^+$$i$. $+6.04 \text{ eV}$
$B$. Potential energy of $I$ orbit of $H$ atom$ii$. $-27.2 \text{ eV}$
$C$. Kinetic energy of $II$ excited state of $He^+$$iii$. $8.72 \times 10^{-18} \text{ J}$
$D$. Ionization potential of $He^+$$iv$. $-54.4 \text{ eV}$

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The statement that is $NOT$ correct is:

Which of the following violates the Aufbau principle and Hund's rule?

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Which of the following graphs is correct for the kinetic energy $(K.E.)$ of an electron in the $n^{th}$ orbit of a hydrogen-like atom?

The wave function $\psi_{n, l, m_l}$ is a mathematical function whose value depends upon spherical polar coordinates $(r, \theta, \phi)$ of the electron and is characterized by the quantum numbers $n, l$ and $m_l$. Here $r$ is the distance from the nucleus,$\theta$ is the colatitude,and $\phi$ is the azimuth. In the mathematical functions given in the Table,$Z$ is the atomic number and $a_0$ is the Bohr radius.
Column-$I$ Column-$II$ Column-$III$
$I$. $1s$ orbital $i$. $\psi_{n, l, m_l} \propto (\frac{Z}{a_0})^{3/2} e^{-(Zr/a_0)}$ $P$. (Graph shown)
$II$. $2s$ orbital $ii$. One radial node $Q$. Probability density at nucleus $\propto 1/a_0^3$
$III$. $2p_z$ orbital $iii$. $\psi_{n, l, m_l} \propto (\frac{Z}{a_0})^{5/2} r e^{-(Zr/2a_0)} \cos \theta$ $R$. Probability density is maximum at nucleus
$IV$. $3d_{z^2}$ orbital $iv$. $xy$-plane is a nodal plane $S$. Energy needed to excite electron from $n=2$ state to $n=4$ state is $27/32$ times the energy needed to excite electron from $n=2$ state to $n=6$ state

$1$. For the given orbital in Column-$I$,the only $CORRECT$ combination for any hydrogen-like species is:
$[A] (IV)(iv)(R)$ $[B] (II)(ii)(P)$ $[C] (III)(iii)(P)$ $[D] (I)(ii)(S)$
$2$. For $He^{+}$ ion,the only $INCORRECT$ combination is:
$[A] (II)(ii)(Q)$ $[B] (I)(i)(S)$ $[C] (I)(i)(R)$ $[D] (I)(iii)(R)$
$3$. For the hydrogen atom,the only $CORRECT$ combination is:
$[A] (I)(iv)(R)$ $[B] (I)(i)(P)$ $[C] (II)(i)(Q)$ $[D] (I)(i)(S)$

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