A. Answer the following questions in about twenty words.
1. Mention some physical properties of metals.
etals
4. Mention two uses of (a) antimony, (b) zinc.
2. How will you show that metals form basic oxides, whereas non-metals form acidic oxides?
3. List the factors affecting the rate of corrosion.
Comment on the allotropic nature of nonmetals. Give example.
6. Compare the electrochemical nature of metals and nonmetals.
7. Write a short note on galvanisation of iron.
8. What is meant by cathodic protection?
9. Give three uses of boron.
10. On the basis of its conductivity, how will an element be classified as metal or nonmetal?
Answers
Answer:
Metals Non-metals
Good conductors of electricity Poor conductors of electricity
Good conductors of heat Poor conductors of heat
High density Low density
Malleable and ductile Brittle
Antimony is a chemical element with the symbol Sb (from Latin: stibium) and atomic number 51. A lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite (Sb2S3). Antimony compounds have been known since ancient times and were powdered for use as medicine and cosmetics, often known by the Arabic name kohl.[5] Metallic antimony was also known, but it was erroneously identified as lead upon its discovery. The earliest known description of the metal in the West was written in 1540 by Vannoccio Biringuccio.
They are usually formed by reacting oxygen with metals, especially alkali and alkaline earth metals, whereas non-metals usually form acidic oxides. Examples include: Sodium oxide, which reacts with water to produce sodium hydroxide.
chemical composition of the soil constituents, the pore water composition and the pH levels can also affect corrosion rates. in soil. There are at least two kinds of pro- cesses which seem to have great potential influence. the solubility of certain corrosion products.
Answer:
basic complex these are answers