Bohr's atomic model fails to explain the spectrum of:
A. Multi-electron atoms
B. Hydrogen atom
C. Lithium ion (Li²⁺)
D. Helium ion (He⁺)
Answer: Option A
Solution (By JKSSB Mock Tests)
Bohr's model successfully explains the spectrum of hydrogen and hydrogen-like species (single electron systems like He⁺, Li²⁺). However, it fails to explain the spectra of multi-electron atoms due to electron-electron repulsions and cannot account for the splitting of spectral lines in magnetic (Zeeman) and electric (Stark) fields.
Explanation:
The head (–COO⁻) is ionic and attracted to water (hydrophilic). The long hydrocarbon tail is non-polar and hydrophobic, dissolving in grease. This amphiphilic nature allows cleaning.
Explanation:
NPK stands for Nitrogen (N), Phosphorus (P), and Potassium (K). These are the three primary macronutrients essential for plant growth. N promotes leafy growth, P aids root and flower development, and K improves overall health and disease resistance in crops.
Explanation:
Magnesium loses two electrons to achieve noble gas configuration (Mg → Mg²⁺), so its electrovalency is +2. In MgCl₂, Mg²⁺ and two Cl⁻. Electrovalency is the charge on the ion. Covalency is number of covalent bonds. For Group 2 metals, electrovalency is always +2 (loss of 2 electrons).
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