James Chadwick bombarded beryllium with alpha particles and discovered:
A. Neutron
B. Electron
C. Positron
D. Proton
Answer: Option A
Solution (By JKExamLibrary)
Chadwick (1932) produced highly penetrating neutral radiation by bombarding Be with α-particles, identified as neutrons. Reaction: ⁹Be + ⁴He → ¹²C + ¹n.
Explanation:
Boyle's law: PV = constant (at fixed T and n). So P ∝ 1/V. If volume is doubled, pressure halves. Charles' law relates V and T; Graham's law relates diffusion rate to molar mass.
Explanation:
James Chadwick discovered the neutron in 1932 by bombarding beryllium with alpha particles, producing a neutral radiation that he identified as neutrons. Rutherford had predicted the existence of a neutral particle in 1920. Chadwick's discovery explained isotopes' mass differences. Neutron: mass ≈ 1.00866 u, no charge. It is stable inside the nucleus but decays (half-life ~10 min) when free.
Explanation:
H₂S is oxidized (S²⁻ → S, loss of electrons), so it acts as the reducing agent. FeCl₃ is reduced (Fe³⁺ → Fe²⁺) and acts as oxidizing agent. The substance oxidized is the reducing agent.
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