Niels Bohr's model of the atom introduced the concept of:
A. Quantized electron orbits.
B. Wave-particle duality of electrons.
C. Electrons embedded in a positive sphere.
D. A dense central nucleus.
Answer: Option A
Solution (By JKSSB Mock Tests)
In 1913, Niels Bohr modified Rutherford's model to explain atomic stability and emission spectra. He introduced the concept of quantized electron orbits (or energy levels), stating that electrons revolve in specific, fixed orbits without radiating energy, and they only emit or absorb energy when jumping between these discrete levels.
Explanation:
Hydrogen peroxide decomposes into water and oxygen. A single reactant breaks down into two or more products, so it is a decomposition reaction. This particular reaction can be catalyzed by MnO₂ or light. It is also a disproportionation redox reaction where O in H₂O₂ (-1) goes to -2 in H₂O and 0 in O₂.
Explanation:
Methanol (CH₃OH) is metabolized to formaldehyde and formic acid, causing optic nerve damage, blindness, or death. Ethanol is used in beverages.
Explanation:
Urea (NH₂CONH₂) contains about 46% N. Ammonium sulfate ~21% N, sodium nitrate ~16% N, DAP ~18% N (and 46% P₂O₅). Urea is the most concentrated solid nitrogen fertilizer.
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