MCQ
In Greece and Italy, marble statues were damaged by :
- ASmog
- ✓Acid rains
- CEutrophication
- DLeakage of $\ce{Cl_2}$
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| 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 :