An element 'A' has two electrons in the outermost shell of its atom and combines with an element 'B' having seven electrons in the outermost shell, forming the compound AB 2 . The compound when dissolved in water conducts electric current. Giving reasons, state the nature of chemical bond in the compound.

Compound AB 2 is ionic in nature. Atom A has two electrons in its outermost shell and atom B needs one electron to complete its octet. Atom A transfers its two electrons to two atoms of B one electron to each atom B and gets stabilised by forming ionic bonds. When dissolved in water, the ions of this ionic compound get separated from each other and conduct electricity across the solution.

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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The noble gas having only two electrons in its valence shell is :

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Important Questions on Metals And Non-Metals

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Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Multiple Choice Questions (MCQs)>Q 65

One of the following contains a double bond as well as single bonds. This is:

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Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Multiple Choice Questions (MCQs)>Q 66

Which of the following has a triple bond as well as single bonds?

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Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Questions Based on High Order Thinking Skills (HOTS)>Q 67

Two non-metals combine with each other by the sharing of electrons to form a compound X.
(a) What type of chemical bond is present in X?
(b) State whether X will have a high melting point or low melting point.
(c) Will it be a good conductor of electricity or not?
(d) Will it dissolve in an organic solvent or not?

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Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Questions Based on High Order Thinking Skills (HOTS)>Q 68

A metal combines with a non-metal by the transfer of electrons to form a compound Y.
(i) State the type of bonds in Y.
(ii) What can you say about its melting point and boiling point?
(iii) Will it be a good conductor of electricity?
(iv) Will it dissolve in an organic solvent or not?

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Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Questions Based on High Order Thinking Skills (HOTS)>Q 69

The electronic configurations of three elements

X, Y

and

Z

are as follows:

X

2

4

Y

2

7

Z

2

1

(a) Which two elements will combine to form an ionic compound?
(b) Which two elements will react to form a covalent compound?
Give reasons for your choice.

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Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Questions Based on High Order Thinking Skills (HOTS)>Q 70

An element

A

has

4

valence electrons in its atom whereas element

B

has only one valence electron in its atom. The compound formed by

A

and

B

does not conduct electricity. What is the nature of chemical bond in the compound formed? Give its electron-dot structure.

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Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Questions Based on High Order Thinking Skills (HOTS)>Q 71

In the formation of a compound

{XY}_{2}

atom

X

gives one electron to each

Y

atom. What is the nature of bond in

{XY}_{2}

? Give two properties of

{XY}_{2}

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IMPORTANT

Science for Tenth Class Part - 2 Chemistry>Chapter 3 - Metals And Non-Metals>Questions Based on High Order Thinking Skills (HOTS)>Q 72

An element 'A' has two electrons in the outermost shell of its atom and combines with an element 'B' having seven electrons in the outermost shell, forming the compound AB₂. The compound when dissolved in water conducts electric current. Giving reasons, state the nature of chemical bond in the compound.

The noble gas having only two electrons in its valence shell is :

Important Questions on Metals And Non-Metals

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