Question 1:

According to the Bohr model of the atom, electrons orbit the nucleus in:

Explanation: The correct answer is A) Fixed circular orbits. According to Bohr's model, electrons revolve around the nucleus in specific quantized energy levels.

Question 2:

The quantum mechanical model describes electrons in atoms as:

Explanation: The correct answer is C) Probability clouds. The quantum mechanical model describes electrons as wave-like entities that exist in regions of high probability known as orbitals or electron clouds.

Question 3:

The quantum mechanical model is based on:

Explanation: The correct answer is B) Wave-particle duality. The quantum mechanical model incorporates the wave-particle duality of matter, where particles such as electrons exhibit both wave and particle characteristics.

Question 4:

The quantum mechanical model predicts that the energy of an electron in an atom is:

Explanation: The correct answer is B) Discrete and quantized. In the quantum mechanical model, electron energies are restricted to specific quantized energy levels, unlike in classical physics where energy can have any continuous value.

Question 5:

Which atomic model successfully explains the emission and absorption spectra of atoms?

Explanation: The correct answer is A) Bohr model. The Bohr model successfully explains the emission and absorption spectra of atoms by considering the quantized energy levels of electrons and their transitions between these levels.