$A$ hydrogen atom emits blue light when it changes from the $n = 4$ energy level to the $n = 2$ level. Which colour of light would the atom emit when it changes from the $n = 5$ level to the $n = 2$ level?

Energy levels $A, B, C$ of a certain atom correspond to increasing values of energy,that is,$E_A < E_B < E_C$. If $\lambda_1, \lambda_2, \lambda_3$ are the wavelengths of radiations corresponding to the transitions $C$ to $B$,$B$ to $A$,and $C$ to $A$ respectively,as shown in the figure. Which of the following statements is correct?

An electron with kinetic energy $E$ collides with a hydrogen atom in the ground state. The collision will be elastic

The energy required to remove an electron in a hydrogen atom from $n = 10$ state is (in $\text{ eV}$)

In a hydrogen atom,when an electron jumps from the second to the first orbit,the energy emitted is:

The minimum energy required by a hydrogen atom in the ground state to emit radiation in the Balmer series is nearly: (in $eV$)