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>Very Short Answer Type Questions>Q 8

MEDIUM

10th CBSE

IMPORTANT

Earn 100

Write down the electronic configuration of (i) magnesium atom, and (ii) magnesium ion. (Atomic Number of $M g = 12$ ).

Important Questions on Metals And Non-Metals

MEDIUM

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Very Short Answer Type Questions>Q 8

Write down the electronic configuration of (i) sulphur atom, and (ii) sulphide ion. (Atomic Number of

S

=

16

)

MEDIUM

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Very Short Answer Type Questions>Q 9

What type of chemical bonds are present in a solid compound which has a high melting point, does not conduct electricity in the solid-state but becomes a good conductor in the molten state?

MEDIUM

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Very Short Answer Type Questions>Q 10

The aqueous solution of an ionic compound conducts electricity because there are plenty of free electrons in the solution.

MEDIUM

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Very Short Answer Type Questions>Q 11

What type of bonds are present in hydrogen chloride and oxygen? (Covalent / Ionic)

MEDIUM

10th CBSE