Which fossil fuel is formed from the remains of ancient marine plants and animals under high pressure and temperature?
A. Charcoal
B. Biogas
C. Coal
D. Petroleum
Answer: Option D
Solution (By JKSSB Mock Tests)
Petroleum (crude oil) and natural gas are formed from the remains of tiny marine organisms (plankton) that settled on the seabed, buried under sediment, and transformed by heat and pressure over millions of years. Coal is formed from terrestrial plant material in swampy conditions. Biogas is produced by anaerobic decomposition of organic waste. Charcoal is produced by destructive distillation of wood.
Explanation:
Redox stands for reduction-oxidation. In any redox reaction, oxidation (loss of electrons) and reduction (gain of electrons) always occur simultaneously. The substance oxidized acts as a reducing agent, and the substance reduced acts as an oxidizing agent. One cannot happen without the other.
Explanation:
Bauxite (Al₂O₃·2H₂O) is the primary ore of aluminum. Haematite (Fe₂O₃) is an ore of iron. Cinnabar (HgS) is an ore of mercury, and Galena (PbS) is an ore of lead. Bauxite is purified to alumina before being electrolyzed to extract pure aluminum metal.
Explanation:
The object to be plated is connected to the negative terminal (cathode). Metal ions from the electrolyte are reduced and deposited on the cathode. The anode is usually the plating metal, which dissolves to replenish the electrolyte. For example, in silver plating, the article is the cathode and silver bar is the anode.
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