Neutrons cannot produce ionization. Why ?

Neutrons are the best projectiles to produce nuclear reactions. Why ?

Second ionization energy of an element is higher than its first ionization energy . Why ?

Second ionization energy of an element is higher than its first ionization energy Why ?

(A): A tuning fork produces sound of a single frequency when it is exited (R): Due to its construction it cannot produce its harmonics.

The angles of a quadrilateral cannot be in ratio of 1:2:3:6. Why? Give reasons.

Among ClO^(-), ClO_(2)^(-), ClO_(3)^(-), ClO_(4)^(-) which one cannot disproportionate and why ?

What useful to slow down neutrons produced by fission in a nuclear reaction?

Equivalent conductance of a week electrolyte at infinite dilution cannot be dilution cannot be directly measured. Why ? How is this calculated ?

Sn^(2+) and Fe^(3+) cannot coexist in the same solution. Why?