In a galvanic (voltaic) cell, chemical energy converts to electrical energy. Oxidation occurs at the anode, which is the negative electrode (electrons leave from it). Reduction occurs at the cathode, which is positive. This is opposite to electrolytic cell where anode is positive. Daniell cell: Zn anode (-), Cu cathode (+).
Explanation:
Chlorophyll, the green pigment in plants, contains a magnesium ion (Mg²⁺) at the center of the porphyrin ring. It's essential for photosynthesis. Haemoglobin in blood contains iron. Calcium is in bones. Sodium is in body fluids.
Explanation:
Hydraulic washing (or gravity separation) is based on the difference in specific gravities (densities) of the ore and the gangue (impurities). The powdered ore is washed with a stream of water; lighter impurities are washed away, leaving the heavier ore particles behind.
Explanation:
Biogas, commonly known as gobar gas in India, is produced by the anaerobic digestion of organic waste (like cattle dung) by methanogenic bacteria. The primary component of biogas is methane (CH4), which typically makes up 50-75% of the gas mixture, along with carbon dioxide and trace gases.
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