Chapter 2

The electronic configurations of \({ }_{24} \mathrm{Cr}\) and \({ }_{29} \mathrm{Cu}\) are abnormal (a) Due to extra stability of exactly half filled and exactly fully filled sub shells (b) Because they belong to d-block (c) Both the above (d) None of the above

Among the following series of transition metal ions, the one where all metal ions have same \(3 d\) electronic configuration is: (a) \(\mathrm{Ti}^{2+}, \mathrm{V}^{3+}, \mathrm{Cr}^{4+}, \mathrm{Mn}^{5+}\) (b) \(\mathrm{Ti}^{3+}, \mathrm{V}^{2+}, \mathrm{Cr}^{3+}, \mathrm{Mn}^{4+}\) (c) \(\mathrm{Ti}^{+}, \mathrm{V}^{4+}, \mathrm{Cr}^{6+}, \mathrm{Mn}^{7+}\) (d) \(\mathrm{Ti}^{4+}, \mathrm{V}^{3+}, \mathrm{Cr}^{2+}, \mathrm{Mn}^{3+}\)

Which of the following has the maximum number of unpaired electrons? (a) \(\mathrm{Mn}\) (b) Ti (c) \(\mathrm{V}\) (d) \(\mathrm{Al}\)

The Schrodinger wave equation for hydrogen atom is $$ \Psi(\text { radial })=\frac{1}{16 \sqrt{4}}\left(\frac{z}{a_{0}}\right)^{3 / 2}\left[(\sigma-1)\left(\sigma^{2}-8 \sigma+12\right)\right] e^{-\sigma / 2} $$ where \(a_{0}\) and \(Z\) are the constant in which answer can be expressed and \(\sigma=\frac{2 Z r}{a_{0}}\) minimum and maximum position of radial nodes from nucleus are ......respectively. \(\therefore .\) 1 \(\begin{array}{llll}\text { (a) } \frac{a_{0}}{Z}, \frac{3 a_{0}}{Z} & \text { (b) } \frac{a_{0}}{2 Z}, \frac{a_{0}}{Z} & \text { (c) } \frac{a_{0}}{2 Z}, \frac{3 a_{0}}{Z} & \text { (d) } \frac{a_{0}}{2 Z}, \frac{4 a_{0}}{Z}\end{array}\)