NEET Practice Questions (MCQs) with Answers & Solutions

Consider an electron which is brought close to the nucleus of the atom from an infinite distance, the energy of the electron-nucleus system:

Using arbitrary energy units we can calculate that 864 arbitrary units (a.u.) are required to transfer an electron in hydrogen atom from the most stable Bohr's orbit to the largest distance from the nucleus 

n = $\infty$   E= 0

n = 1 ;   E= -864 Arbitrary units

The energy required to transfer the electron from third Bohr's orbit to the orbit n = $\infty$will be-

The number of electrons in one molecule of CO₂ are - 

The ion that is isoelectronic with CO is-

A glow worm of mass 5.0 g emits red light (650 nm) with a power of 0.1 W. entirely in the backward direction. What velocity would it accelerate to after 10 years, if released in free space (and assumed to be alive)?

For principle quantum number n = 4 the total number of orbitals having $\mathcal{l}$ = 3  is - 

The presence of one electron each in the three 2p sub-shell of nitrogen is explained by 

Which one of the following statement is not true about the quantum numbers n, l, m and s

The number of electrons in the valence shell of calcium is 

The brackett series of spectral lines arise when an electron in an excited hydrogen atom jumps from an energy level