The 71^st electron of an element X with an atomic number of 71 enters into the orbital :

The ground state energy of hydrogen atom is – 13.6 eV. The energy of second excited state of He⁺ ion in eV is :

Which of the following tests cannot be used for identifying amino acids?

In the reaction of oxalate with permanganate in acidic medium, the number of electrons involved in producing one molecule of CO₂ is :