9th Standard Syllabus & Materials
9th Standard
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NEW9th Standard
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Published on: 07/12/2019
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.
Discuss in brief about the properties of Coordinate covalent compounds.
2.
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.
3.
Statement (A) : Covalent compounds are bad conductor of electricity.
Reason (B) Covalent compounds contain charged particles (ions)
B explains A
B does not explain A
Both A & B are right
Both A & B are wrong
4.
Which of the following compound(s) possesses high melting point?
NaCI
MgCI2
CCl4
Both a & b
5.
_______________is an example of a covalent compound having high melting point
Magnesium oxide
Silicon carbide
Ammonia
All the above
6.
___________compounds are highly brittle
Ionic
Covalent
Co-ordinate covalent
Covalent
7.
Alkali and alkaline earth metals form____________ compound when they react with nonmetals
ionic
covalent
co-ordinate covalent
all the above
8.
Ionic bond is also called electrostatic bond.
9.
What are redox reactions? Give examples
10.
What is covalent bond?
11.
Write the basic concept of Kossel - Lewis theory
12.
What is chemical bond?
1.
The compounds containing coordinate covalent bonds are called coordinate compounds.
(a) Physical state - These compounds exist as gases, liquids or solids.
(b) Electrical conductivity - Like covalent compounds, co-ordinate compounds also do not contain charged particles (ions), so they are bad conductors of electricity.
(c) Melting point - These compounds have melting and boiling points higher than those of purely covalent compounds but lower than those of purely ionic compounds.
(d) Solubility - Insoluble in polar solvents like water but are soluble in non-polar solvents like benzene, CCI4, and toluene.
(e) Reactions - Coordinate covalent compounds undergo molecular reactions which are slow.
2.
(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.
3.
(b)
B does not explain A
4.
(d)
Both a & b
5.
(b)
Silicon carbide
6.
(a)
Ionic
7.
(a)
ionic
8.
In ionic bond formation the bond is formed between the oppositely charged ions and these ions come closer to each other due to electrostatic force of attraction. So ionic bond is also called electrostatic bond
9.
Both the oxidation and reduction occurs in the same reaction simultaneously is known as redox reaction. If one reactant gets oxidised, the other gets reduced. Such reactions are called oxidation-reduction reactions or redox reactions
Ex. 1 : 2 PbO + C \(\rightarrow\) 2 Pb + CO2
Ex.2: Zn + CuSO4\(\rightarrow\) Cu + ZnSO4
10.
Bond which is formed between atoms by the mutual sharing of electrons is known as covalent bond.
11.
Kossel - Lewis theory is based on the concept of electronic configuration of noble gases.
12.
A chemical bond may be defined as the force of attraction between the two atoms that binds them together as a unit called molecule
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
