Understanding Heavy Metals
Heavy metals are generally defined as metals with relatively high densities, atomic weights, or atomic numbers. They often exhibit toxicity even at low concentrations. Common examples include Lead (Pb), Mercury (Hg), Cadmium (Cd), and Arsenic (As).
Analyzing the Options
Let's examine each option:
- Lead (Pb): A well-known toxic heavy metal.
- Mercury (Hg): A liquid metal at room temperature, recognized as a highly toxic heavy metal.
- Bismuth (Bi): While less toxic than lead or mercury, bismuth shares properties and a position on the periodic table that often leads to its classification among heavy metals.
- Aluminum (Al): Aluminum is a light metal. It has a significantly lower density compared to typical heavy metals and is generally considered much less toxic. It is classified as a light metal.
Identifying the Non-Heavy Metal
Based on density, toxicity, and common chemical classification:
- Lead is a heavy metal.
- Mercury is a heavy metal.
- Bismuth is generally considered a heavy metal.
- Aluminum is a light metal, not a heavy metal.
Therefore, Aluminum is the correct answer as it does not fit the criteria for a heavy metal.
Important Questions from Ecology and Environment
Which one of the following cities is associated with Biosaftey protocol to the Convention on Biological Diversity (2000) ?
The following six (6) items consist of two statements, Statement I and Statement II. Examine these two statements carefully and select the answer using the code given below.
Statement I: Phytoplankton produce most of the organic carbon in the ocean.
Statement II: Algae are produced in the cold water biome.
Which one of the following is the correct sequence about various levels of organization of Biosphere?
In India, Project Tiger started in ________.
The process of wastewater treatment is commonly called ______ treatment.
