Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 9th
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SSLC (English Medium) Class 9th - Tamil Nadu Board of Secondary Education Question Bank Solutions for Science

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Science
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Diffentiate between absorption and adsorption.

[0.1] Matter Around Us
Chapter: [0.1] Matter Around Us
Concept: Matter (Substance)

Match the following.

a. Dalton 1. Hydrogen atom model
b. Chadwick 2. Discovery of nucleus
c. Rutherford 3. First atomic theory
d. Neils Bohr 4. Plum pudding model
    5. Discovery of neutrons
[0.11] Atomic Structure
Chapter: [0.11] Atomic Structure
Concept: Introduction of Atoms

The basis of the classifications proposed by Dobereiner, Newlands and Mendeleev was ______.

[0.12] Periodic Classification of Elements
Chapter: [0.12] Periodic Classification of Elements
Concept: History of Periodic Table: Early Attempts at the Classification of Elements

Example for liquid metal is ______.

[0.12] Periodic Classification of Elements
Chapter: [0.12] Periodic Classification of Elements
Concept: History of Periodic Table: Early Attempts at the Classification of Elements

State whether true or false. If false, correct the statement.

Metals can gain electrons.

[0.12] Periodic Classification of Elements
Chapter: [0.12] Periodic Classification of Elements
Concept: History of Periodic Table: Early Attempts at the Classification of Elements

Number of valence electrons in carbon is ______.

[0.13] Chemical Bonding
Chapter: [0.13] Chemical Bonding
Concept: Chemical Bond

Sodium having atomic number 11, is ready to ______ electron/ electrons to attain the nearest noble gas electronic configuration.

[0.13] Chemical Bonding
Chapter: [0.13] Chemical Bonding
Concept: Chemical Bond

The element that would form anion by gaining electrons in a chemical reaction is ______.

[0.13] Chemical Bonding
Chapter: [0.13] Chemical Bonding
Concept: Chemical Bond

Elements with stable electronic configurations have eight electrons in their valence shell. They are ______.

[0.13] Chemical Bonding
Chapter: [0.13] Chemical Bonding
Concept: Chemical Bond

How do atoms attain Noble gas electronic configuration?

[0.13] Chemical Bonding
Chapter: [0.13] Chemical Bonding
Concept: Chemical Bond

Explain Octet rule with an example.

[0.13] Chemical Bonding
Chapter: [0.13] Chemical Bonding
Concept: Chemical Bond

Complete the table give below.

Element

Atomic number

Electron distribution Valence electrons Lewis dot structure
Lithium 3 1s22s1    
Boron 5 1s22s22p1    
Oxygen 8 1s22s22p4    
[0.13] Chemical Bonding
Chapter: [0.13] Chemical Bonding
Concept: Chemical Bond

Draw the electron distribution diagram for the formation of Carbon di oxide (CO2 ) molecule.

[0.13] Chemical Bonding
Chapter: [0.13] Chemical Bonding
Concept: Chemical Bond

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.

[0.13] Chemical Bonding
Chapter: [0.13] Chemical Bonding
Concept: Chemical Bond

Why are Noble gases inert in nature?

[0.13] Chemical Bonding
Chapter: [0.13] Chemical Bonding
Concept: Chemical Bond

Zn + 2 HCl → ZnCl2 +_____↑

[0.14] Acids, Bases and Salts
Chapter: [0.14] Acids, Bases and Salts
Concept: Acids

Since metal carbonate and metal bicarbonate are basic, they react with acids to give salt and water with the liberation of ______.

[0.14] Acids, Bases and Salts
Chapter: [0.14] Acids, Bases and Salts
Concept: Acids

Classify the various types of Acids based on their sources.

[0.14] Acids, Bases and Salts
Chapter: [0.14] Acids, Bases and Salts
Concept: Acids

Two acids ‘A’ and ‘B’ are given. Acid A gives one hydrogen ion per molecule of the acid in solution. Acid B gives two hydrogen ions per molecule of the acid in solution.

  1. Find out acid A and acid B.
  2. Which acid is called the King of Chemicals?
[0.14] Acids, Bases and Salts
Chapter: [0.14] Acids, Bases and Salts
Concept: Acids

What is neutralization reaction? Give an example.

[0.14] Acids, Bases and Salts
Chapter: [0.14] Acids, Bases and Salts
Concept: Acids
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