The Bohr model for the spectra of a H-atom

A. Will not be applicable: to hydrogen in the molecular form

B. Will not be applicable as it is for a He-atom

C. Is valid only at room temperature

D. Predicts continuous as well as discrete spectral lines

Choose the correct answer from the options given below:

A, B only

The correct answer is Option 1: A, B only

A. Will not be applicable to hydrogen in molecular form — Correct statement. The Bohr model is applicable only to single-electron systems. Molecular hydrogen (H₂) has more than one electron and involves electron sharing, so the model does not apply.

B. Will not be applicable as it is for a He-atom — Correct statement. A helium atom has two electrons, and the Bohr model cannot handle electron–electron interactions. Hence, it is not applicable.

C. Is valid only at room temperature — Incorrect statement. The Bohr model is based on atomic structure and energy levels, which are independent of temperature. It is not restricted to room temperature.

D. Predicts continuous as well as discrete spectral lines — Incorrect statement. The Bohr model predicts only discrete spectral lines due to quantized energy levels, not continuous spectra.