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.

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An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be:

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Important Questions on Metals And Non-Metals

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10th CBSE

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Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Multiple Choice Questions (MCQs)>Q 84

Which one of the following four metals would be displaced from the solution of its salt by the other three metals?

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Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Multiple Choice Questions (MCQs)>Q 85

An element is soft and can be cut with a knife. It is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be :

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Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Multiple Choice Questions (MCQs)>Q 86

Which of the following metal exists in the liquid state?

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Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Multiple Choice Questions (MCQs)>Q 87

Which of the following non-metal is a liquid?

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Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Multiple Choice Questions (MCQs)>Q 88

Which of the following pair of reactants can undergo a displacement reaction under appropriate conditions?

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10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Questions Based on High Order Thinking Skills (HOTS)>Q 89

An element

E

forms an oxide

E_{2} O

. An aqueous solution of

E_{2} O

turns red litmus paper blue.
(a) What is the nature of the oxide

E_{2} O

?
(b) State whether element

E

is a metal or a non-metal.
(c) Give one example of an element like

E

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10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Questions Based on High Order Thinking Skills (HOTS)>Q 90

Metal

A

burns in air, on heating, to form an oxide

A_{2} O_{3}

whereas another metal

B

burns in air only on strong heating to form an oxide

B O

. The two oxides

A_{2} O_{3}

and

B O

can react with hydrochloric acid as well as sodium hydroxide solution to form the corresponding salts and water.
(a) What is the nature of oxide

A_{2} O_{3}

?
(b) What is the nature of oxide

B O

?
(c) Name one metal like

A

.
(d) Name one metal like

B

HARD

10th CBSE

IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Questions Based on High Order Thinking Skills (HOTS)>Q 91

An element

X

forms two oxides

X O

and

{X O}_{2}

. The oxide

X O

has no action on litmus solution but the oxide

{X O}_{2}

turns litmus solution red.
(a) What is the nature of oxide

X O

?
(b) What is the nature of the oxide

{X O}_{2}

?
(c) Would you call element

X

a metal or a non-metal? Give a reason for your choice.
(d) Can you give an example of an element like

X

An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be:

Important Questions on Metals And Non-Metals

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