Arsenic (As) is a metalloid, showing properties of both metals and non-metals. It is in group 15, period 4. Sodium and calcium are metals. Oxygen is a non-metal. Metalloids: B, Si, Ge, As, Sb, Te. They are semiconductors and form amphoteric oxides.
Explanation:
Ethanol (C₂H₅OH) is the intoxicating ingredient in beer, wine, spirits. Methanol is toxic. Propanol and butanol are used as solvents, not beverages.
Consider the following statements: 1. Biofuels are renewable energy sources. 2. Biodiesel is produced by the transesterification of vegetable oils. Which is/are correct?
Explanation:
Biofuels, such as bioethanol and biodiesel, are derived from recent biological materials (biomass) and can be replenished, making them renewable. Biodiesel is specifically produced through transesterification, a chemical reaction where vegetable oils or animal fats react with an alcohol (like methanol) to form fatty acid methyl esters.
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