Bohr's atomic model fails to explain the spectrum of:
A. Hydrogen atom
B. Helium ion (He⁺)
C. Multi-electron atoms
D. Lithium ion (Li²⁺)
Answer: Option C
Solution (By JKExamLibrary)
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:
Ethylene glycol (1,2-ethanediol) is the main component of antifreeze, lowering the freezing point of water. Methanol is toxic, ethanol can be used but evaporates, glycerol is viscous. Ethylene glycol is poisonous if ingested. Propylene glycol is a safer alternative.
Explanation:
Water decomposes as 2H₂O → 2H₂ + O₂. So 2 volumes of H₂ for every 1 volume of O₂, ratio 2:1. Hydrogen collected at cathode, oxygen at anode.
Explanation:
HCl + NaOH → NaCl + H₂O. This is a neutralization reaction producing sodium chloride (common salt). NaNO₃ from HNO₃, Na₂SO₄ from H₂SO₄, Na₂CO₃ from H₂CO₃ (weak acid).
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