MCQ
The hydration enthalpies of alkali metal ions decrease with increase-in ionic size. Which of the following ions has maximum degree of hydration?
- A$Na^+$
- B$K^+$
- ✓$Li^+$
- D$Cs^+$
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$(i)$ $n\, = 4, l\, = 1$ $(ii)$ $n\, = 4, l\, = 0$
$(iii)$ $n\, = 3, l\, = 2$ $(iv)$ $n\, = 3, l\, = 1$
The sequence representing increasing order of energy, is
| Energy level | $K$ | $L$ | $M$ | $N$ |
| $n=1$ | $n=2$ | $n=3$ | $n=4.....n=\infty$ | |
| Energy | $- 864 \,a.u.$ | Zero |
the excitation energy needed to raise the electron from $M$ level to $n = \infty$ would be :
The value of $x$ is