9th Standard Syllabus & Materials
9th Standard
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NEW9th Standard
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NEW9th Standard
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NEW9th Standard
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NEW9th Standard
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Published on: 09/09/2019
Chemical Bonding
Download Tamil Nadu 9th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
An atom X with atomic number 20 combines with atom Y with atomic number 8. Draw the dot structure for the formation of the molecule XY.
2.
Draw the electron distribution diagram for the formation of Carbon di oxide (CO2) molecule.
3.
Write a note on different types on bonds?
4.
How do atoms attain Noble gas electronic configuration
5.
Complete the table give below.
| Element | Atomic number | Electron distribution | Valence electrons | Lewis dot structure |
| Lithium | 3 | |||
| Boron | 5 | |||
| Oxygen | 8 |
6.
Identify the incorrect statement and correct them.
a. Like covalent compounds, Coordinate compounds also contain charged particles (ions), so they are good conductors of electricity.
b. Ionic bond is a weak bond when compared to Hydrogen bond.
c. Ionic or electrovalent bonds are formed by mutual sharing of electrons between atoms.
d. Loss of electrons is called Oxidation and Gain of electron is called Reduction.
e.The electrons which are not involved in bonding are called valence electrons.
7.
List down the differences between Ionic and Covalent compounds.
8.
The property which is characteristics of an Ionic compound is that
it often exists as gas at room temperature
it is hard and brittle
it undergoes molecular reactions
it has low melting point
9.
Elements with stable electronic configurations have eight electrons in their valence shell. They are__________
Halogens
Metals
Noble gases
non metals
10.
Oxidising agents are also called as____________because they remove electrons form other substances.
electron donors
electron acceptors
reducing agents
Ionic agents
11.
____________compounds have high melting and boiling points.
Covalent
Coordinate
Ionic
Coordinate
12.
Number of valence electrons in carbon is
2
3
4
5
1.
X is calcium, its electronic configuration is 2,8,8,2.
Y is oxygen its electronic configuration is 2,6.
2.
3.
Chemical bonds are divided into two. One is strong bond and another one is weak bond. The strong bond is further divided into ionic bond, covalent bond, coordinate bond and metallic bond. Weak bond is divided into Hydrogen bond and Van der walls interaction.
4.
Atoms of all elements, other than inert gases, combine to form molecules because they have incomplete valence shell and tend to attain a stable electronic configuration similar to noble gases. Atoms can combine either by transfer of valence electrons from one atom to another or by sharing of valence electrons in order to achieve the stable outer shell of eight electrons.
5.
| Element | Atomic number | Electron distribution | Valence electrons | Lewis dot structure |
| Lithium | 3 | 2,1 | 1 |  |
| Boron | 5 | 2,3 | 3 |  |
| Oxygen | 8 | 2,6 | 6 |  |
6.
(a) Like covalent compounds, coordinate compounds also do not contain charged particles (ions) so they are bad conductors of electricity.
(b) Ionic bond is a strong bond when compared to Hydrogen bond.
(c) Ionic or electrovalent bonds are formed by transfer of electrons between atom.
(e) The electron which are involved in bonding are called valence electrons.
7.
| S.No | Ionic Compounds | Covalent Compounds |
| 1. | Formed by the transfer of electrons from a metal to a non-metal atom. | Formed by sharing of electrons between non-metal atoms. |
| 2. | Strong electrostatic force of attraction between cations and anions | Mutual sharing of electrons and so weak force of attraction between atoms. |
| 3. | Solids at room temperature. | Gases, liquids and soft solids |
| 4. | Conducts electricity in molten state or in solutions | Non-conductors of electricity |
| 5. | Have high melting and boiling points | Have low melting and boiling points. |
| 6. | Soluble in polar solvents. | Soluble in non-polar solvents |
| 7. | Hard and brittle | Soft and waxy. |
| 8. | Undergo ionic reaction which are fast and instantaneous. | Undergo molecular reactions which are slow. |
8.
(a)
it often exists as gas at room temperature
9.
(c)
Noble gases
10.
(b)
electron acceptors
11.
(c)
Ionic
12.
(c)
4
9th Standard Syllabus & Materials
9th Standard
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NEW9th Standard
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NEW9th Standard
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NEW9th Standard
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Tamilnadu Stateboard 9th Standard Subjects
Tamilnadu Stateboard Standards
