Chapter 2

Energy required to ionise 2 mole of gaseous \(\mathrm{He}^{+}\) ion present in its ground state is : (a) \(54.4 \mathrm{eV}\) (b) \(108.8 \mathrm{~N}_{A} \mathrm{eV}\) (c) \(54.4 \mathrm{~N}_{A} \mathrm{eV}\) (d) \(108.8 \mathrm{eV}\)

The Heisenberg uncertainty principle can be applied to (a) A cricket ball (b) A foot ball (c) A jet aeroplane (d) An electron

"The exact path of electron in 2p-orbital cannot be determined." The above statement is based upon (a) Hund's Rule (b) Bohr's Rule (c) Uncertainty principle (d) Aufbau principle

Which series of subshells is arranged in the order of increasing energy for multi-electron atoms? (a) \(6 s, 4 f, 5 d, 6 p\) (b) \(4 f, 6 s, 5 d, 6 p\) (c) \(5 d, 4 f, 6 s, 6 p\) (d) \(4 f, 5 d, 6 s, 6 p\)

Wave mechanical model of the atom depends upon (a) De-Broglie concept of dual nature of electron (b) Heisenberg uncertainty principle (c) Schrodinger uncertainty principle (d) All

Arrange the orbitals of \(\mathrm{H}\) -atom in the increasing order of their energy \(3 p_{x}, 2 s, 4 d_{x y}, 3 s, 4 p_{z}, 3 p_{y}, 4 s\) (a) \(2 s<3 s=3 p_{x}=3 p_{y}<4 s=4 p_{z}=4 d_{x y}\) (b) \(2 s<3 s<3 p_{x}=3 p_{y}<4 s=4 p_{z}=4 d_{x y}\) (c) \(2 s<3 s<3 p_{x}=3 p_{y}<4 s=4 p_{z}=4 d_{x y}\) (d) \(2 s<3 s<3 p_{x}=3 p_{y}<4 s<4 p_{z}<4 d_{x y}\)

Which of the following orbitals in hydrogen atom is closer to the nucleus? (a) \(5 f\) (b) \(6 d\) (c) \(7 s\) (d) \(7 p\)

The correct order of penetrating power of \(3 s, 3 p, 3 d\) electrons is : (a) \(3 d>3 p>3 s\) (b) \(3 s>3 p>3 d\) (c) \(3 s>3 d>3 p\) (d) \(3 d>3 s>3 p\)

The correct order of total number of node of atomic orbitals is: (a) \(4 f>6 s>5 d\) (b) \(6 s>5 d>4 f\) (c) \(4 f>5 d>6 s\) (d) \(5 d>4 f>6 s\)

Which of the following rules could explain the presence of three unpaired electrons in N-atom? (a) Hund's rule (b) Aufbau's principle (c) Heisenberg's uncertainty principle (d) Pauli's exclusion principle