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 13

MEDIUM

10th CBSE

IMPORTANT

Earn 100

What type of bonds are present in water molecule? Draw the electron-dot structure of water ( $H_{2} O$ ).

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 14

What type of bonds are present in methane

({C H}_{4})

and sodium chloride (

N a C l

)?

MEDIUM

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Very Short Answer Type Questions>Q 15

State one major difference between covalent and ionic bonds and give one example each of covalent and ionic compounds.

MEDIUM

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Very Short Answer Type Questions>Q 16

What type of bond is present in

H_{2}

? Draw the electron-dot structure.

MEDIUM

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Very Short Answer Type Questions>Q 16

What type of bonds are present in

{CH}_{4}

? Draw the electron-dot structure.

MEDIUM

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Very Short Answer Type Questions>Q 16

What type of bonds are present in

{Cl}_{2}

? Draw the electron-dot structure.

MEDIUM

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Very Short Answer Type Questions>Q 16

What type of bonds are present in

O_{2}

? Draw the electron-dot structure.

MEDIUM

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Very Short Answer Type Questions>Q 17

Which inert gas electron configuration do the

Cl

atoms in

{C l}_{2}

molecule resemble? What is this electron configuration?

MEDIUM

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Very Short Answer Type Questions>Q 18

Which of the following compounds are ionic and which are covalent?
Urea, Cane sugar, Hydrogen chloride, Sodium chloride, Ammonium chloride, Carbon tetrachloride, Ammonia, Alcohol, Magnesium chloride.