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.

An element X of atomic number 12 combines with an element Y of atomic number 17 to form a compound XY 2 . State the nature of chemical bond in XY 2 and show how the electron configurations of X and Y change in the formation of this compound.

Compound XY 2 will have ionic bonds because it is formed by transfer of electrons from atoms of element X to atoms of element Y. On forming the compound XY 2 , each atom of element X that has 12 electrons with an electronic configuration of 2,8,2, donates its two electrons to give an ion that has an electronic configuration of 2,8. Similarly, each atom of Y that has 17 electrons with electronic configuration 2,8,7 completes its octet by gaining one electron to an ion that has an electronic configuration of 2,8,8.

The electronic configurations of four particles A, B, C and D given below: A 2, 8, 8 B 2, 8, 2 C 2, 6 D 2, 8 Which electronic configuration represents: (i) Magnesium atom? (ii) Oxygen atom? (iii) Sodium ion? (iv) Chloride ion?

(i) Electronic configuration of particle B represents magnesium atom because its atomic number is 12. (ii) Electronic configuration of particle C represents oxygen atom because its atomic number is 8. (iii) Electronic configuration of particle D represents sodium ion. Atomic number of sodium is 11 and it loses one electron to stabilise and forms sodium ion containing 10 electrons. (iv) Electronic configuration of particle A represents chloride ion. Atomic number of chlorine is 17 and it gains one electron to stabilise and forms chloride ion containing 18 electrons.

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.

MEDIUM

10th CBSE

IMPORTANT

Earn 100

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 ${XY}_{2}$ .

Important Questions on Metals And Non-Metals

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 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.

MEDIUM

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 73

The electronic configurations of two elements A and B are given below :

$A 2, 6 B 2, 8, 1$
(a) What type of chemical bond is formed between the two atoms of A?
(b) What type of chemical bond will be formed between the atoms of A and B?

MEDIUM

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 74

Four elements A, B, C and D have the following electron arrangements in their atoms:

$A 2, 8, 6 B 2, 8, 8 C 2, 8, 8, 1 D 2, 7$
(a) What type of bond is formed when element C combines with element D?
(b) Which element is an inert gas?
(c) What will be the formula of the compound between A and C?

MEDIUM

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 75

An element X of atomic number 12 combines with an element Y of atomic number 17 to form a compound XY₂. State the nature of chemical bond in XY₂and show how the electron configurations of X and Y change in the formation of this compound.

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 76

The electronic configurations of three elements A, B and C are as follows:

$A 2, 8, 1 B 2, 8, 7 C 2, 4$
(a) Which of these elements is a metal?
(b) Which of these elements are non-metals?
(c) Which two elements will combine to form an ionic bond?
(d) Which two elements will combine to form a covalent bond?
(e) Which element will form an anion of valency 1?

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 77

The electronic configurations of four particles A, B, C and D given below:

A	2, 8, 8
B	2, 8, 2
C	2, 6
D	2, 8

Which electronic configuration represents:

(i) Magnesium atom?

(ii) Oxygen atom?

(iii) Sodium ion?

(iv) Chloride ion?

MEDIUM

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 78

The atomic number of an element X is 12.

(a) What must an atom of X do to attain the nearest inert gas electron configuration?
(b) Which inert gas is nearest to X?

MEDIUM

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 79

The atomic number of an element Y is 16.

(a) What must an atom of Y do to achieve the nearest inert gas electron arrangement?
(b) Which inert gas is nearest to Y?

In the formation of a compound XY2 atom X gives one electron to each Y atom. What is the nature of bond in XY2? Give two properties of XY2.

Important Questions on Metals And Non-Metals

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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 ${XY}_{2}$ .