The oil drop experiment to determine the charge of an electron was performed by:
A. James Chadwick
B. J.J. Thomson
C. Robert Millikan
D. Ernest Rutherford
Answer: Option C
Solution (By JKExamLibrary)
Robert Millikan performed the oil drop experiment in 1909. By observing charged oil droplets in an electric field, he accurately determined the elementary charge of an electron (e = 1.6 × 10⁻¹⁹ C). This, combined with Thomson's e/m ratio, allowed calculating the electron's mass.
Explanation:
Ozonation is a powerful disinfection method that kills bacteria and viruses faster than chlorine. Unlike chlorine, ozone decomposes back into oxygen and does not leave a residual taste or form harmful chlorinated organic byproducts (like trihalomethanes), making it safer for drinking water.
Explanation:
Haber process synthesizes ammonia using iron catalyst. Solvay process for soda ash uses no solid catalyst but involves reactions with CO₂ and ammonia. Bayer's process for alumina uses NaOH, no catalyst. Hall-Héroult process is electrolytic for aluminium. Catalysis is key in many industrial processes: Contact (V₂O₅), Ostwald (Pt), hydrogenation (Ni).
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