Those minerals from which the metals can be extracted conveniently and profitably are called ores. For example, pyrolusite is an ore of manganese. Ore is extracted from the earth through mining and treated or refined, often via smelting, to extract the valuable metals or minerals. Metal ores are generally oxides, sulphides, silicates, native metals such as copper, or noble metals such as gold. Ores must be processed to extract the elements of interest from the waste rock.

Corrosion is the damage caused to the metal by the chemical reaction of air, water and acids with the surface of the metal. Generally reactive metals corrode easily and non-reactive metals have good resistance to corrosion. For example, Copper reacts with moist carbon dioxide in the air and gets a green coat of copper carbonate.

Give the name and chemical formula of one ore of copper.

Copper glance is the name of the ore of copper and its chemical formula is Cu 2 S . It is a sulphide ore of Copper. Note: The main copper sulphide minerals are chalcopyrite ( CuFeS 2 ) chalcocite ( Cu 2 S ) , covellite ( CuS ) , bornite ( Cu 5 FeS 4 ) , tetrahedrite and enargite. The largest source of copper is from porphyry ore deposits in which one or a combination of the aforementioned minerals occurs.

Why do we apply paint on iron articles?

By painting the iron article we can prevent rusting. It prevents the contact of air and moisture with the iron that causes iron to rust. After painting iron surface does not come in contact with moisture and air which cause rusting.

Differentiate between metals and non-metals on the basis of their chemical properties.

Chemical properties of metals Chemical properties of non-metal Metals forms basic oxides. Non-metals forms acidic or neutral oxides. Chemical properties of metals Chemical properties of non-metal Metals displace hydrogen from water. Non-metals do not react with water. Chemical properties of metals Chemical properties of non-metal Metals displace hydrogen from dilute acids. Non-metals do not react with dilute acids.

E M B I B E

Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Short Answer Type Questions>Q 42

HARD

10th CBSE

IMPORTANT

Earn 100

How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.

Important Questions on Metals And Non-Metals

HARD

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Short Answer Type Questions>Q 43

What is meant by refining of a metal? Name the most widely used method for the refining of impure metals obtained by various reduction processes. Describe this method with the help of a labelled diagram by taking the example of any metal.

EASY

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Short Answer Type Questions>Q 44

Define the term mineral.

EASY

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Short Answer Type Questions>Q 44

Define the term ore.

EASY

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Short Answer Type Questions>Q 44

Define the term gangue.

MEDIUM

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Short Answer Type Questions>Q 44

What is meant by the 'concentration of ore'?

MEDIUM

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Short Answer Type Questions>Q 44

Name one ore of copper (other than cuprite). Which compound of copper is present in this ore? Also, write its chemical formula.

HARD

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Short Answer Type Questions>Q 45

Explain how, a reduction reaction of aluminium can be used for welding cracked machine parts of iron. Write a chemical equation for the reaction involved.

EASY

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Short Answer Type Questions>Q 46

What is corrosion?