9th Standard Syllabus & Materials
9th Standard
TN 9ஆம் வகுப்பு கணிதம் ஆயத்தொலை வடிவியல்,முக்கோணவியல் முக்கியமான 2,3,&5 மதிப்பெண் வினாக்கள் விடைகளுடன் TN 9th Maths Coordinate Geometry,Trigonometry Important 1 Mark Questions with Answers 2,3,&5 Marks Questions with Answers
NEW9th Standard
TN 9ஆம் வகுப்பு கணிதம் அளவியல்,புள்ளியியல்&நிகழ்தகவு முக்கியமான 2,3,&5 மதிப்பெண் வினாக்கள் விடைகளுடன் TN 9th Maths Mensuration,Statistics&Probability Important 1 Mark Questions with Answers 2,3,&5 Marks Questions with Answers.
NEW9th Standard
TN 9ஆம் வகுப்பு சமூக அறிவியல் வரலாறு - செவ்வியல் உலகம் முக்கியமான 2,3,&5 மதிப்பெண் வினாக்கள் விடைகளுடன் TN 9th Social Science HIS - The Classical World Important 1 Mark Questions with Answers 2,3,&5 Marks Questions with Answers.
NEW9th Standard
TN 9ஆம் வகுப்பு சமூக அறிவியல் வரலாறு - தொடக்ககாலத் தமிழ்ச் சமூகமும் பண்பாடும்முக்கியமான 2,3,&5 மதிப்பெண் வினாக்கள் விடைகளுடன் TN 9th Social Science HIS - Early Tamil Society and Culture Important 1 Mark Questions with Answers 2,3,&5 Marks Questions with Answers.
NEW9th Standard
TN 9ஆம் வகுப்பு சமூக அறிவியல் வரலாறு - தொழிற்புரட்சி முக்கியமான 2,3,&5 மதிப்பெண் வினாக்கள் விடைகளுடன் TN 9th Social Science HIS - Industrial Revolution Important 1 Mark Questions with Answers 2,3,&5 Marks Questions with Answers.
NEW9th Standard
TN 9ஆம் வகுப்பு சமூக அறிவியல் வரலாறு - நவீன யுகத்தின் தொடக்கம் முக்கியமான 2,3,&5 மதிப்பெண் வினாக்கள் விடைகளுடன் TN 9th Social Science HIS - The Beginning of the Modern AgeImportant 1 Mark Questions with Answers 2,3,&5 Marks Questions with Answers.
Published on: 13/05/2022
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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.
Give an example for each of the following statements.
a. A compound in which two Covalent bonds are formed
b. A compound in which one ionic bond is formed
c. A compound in which two Covalent and one Coordinate bonds are formed
d. A compound in which three covalent bonds are formed
e. A compound in which Coordinate bond is formed
4.
List down the differences between Ionic and Covalent compounds.
5.
Find the oxidation number of the elements in the following compounds.
a. C in CO2
b. Mn in MnSO4
c. N in HNO3
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.
a) Formation of Oxygen molecule (O2)
b) Formation of Sodium chloride (NaCl)
c) Formation of Ammonia and BF3 molecules
d) Formation of Nitrogen molecule (N2)
e) Formation of Ammonium Ion.
4.
| 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. |
5.
a) C in CO2
Let C be x and we know O = -2
So,
(x) + 2 x (-2) = 0
x + (-4) = 0
x = +4
So oxidation number of carbon is +4.
b) Mn in MnSO4
Let on Mn be x and we know S is +6, O is -2
So,
(x) + (1 x +6) + (4 x -2) = 0
x + 6 + (-8) = 0
x - 2 = 0
x = +2
Oxidation number of Mn is +2.
c) N in HNO3
Let N be x and we know H is +1 and 0 is -2
So,
(+1) + (x) + 3 x (-2) = 0
+1 + (x) - 6 = 0
x - 5 = 0
x = +5
Oxidation number of N is +5.
9th Standard Syllabus & Materials
9th Standard
TN 9ஆம் வகுப்பு சமூக அறிவியல் வரலாறு - பண்டைய நாகரிகங்கள் முக்கியமான 2,3,&5 மதிப்பெண் வினாக்கள் விடைகளுடன் TN 9th Social Science HIS - Ancient . Civilisations Important 1 Mark Questions with Answers 2,3,&5 Marks Questions with Answers.
NEW9th Standard
TN 9ஆம் வகுப்பு சமூக அறிவியல் வரலாறு - புரட்சிகளின் காலம் முக்கியமான 2,3,&5 மதிப்பெண் வினாக்கள் விடைகளுடன் TN 9th Social Science HIS - The Age of Revolutions Important 1 Mark Questions with Answers 2,3,&5 Marks Questions with Answers.
NEW9th Standard
TN 9ஆம் வகுப்பு சமூக அறிவியல் வரலாறு - இடைக்கால இந்தியாவில் அரசும் சமூகமும் முக்கியமான 2,3,&5 மதிப்பெண் வினாக்கள் விடைகளுடன் TN 9th Social Science HIS - State and Society in Medieval India Important 1 Mark Questions with Answers 2,3,&5 Marks Questions with Answers.
NEW9th Standard
TN 9ஆம் வகுப்பு சமூக அறிவியல் வரலாறு - ஆசிய ஆப்பிரிக்க நாடுகளில் காலனியாதிக்கம் முக்கியமான 2,3,&5 மதிப்பெண் வினாக்கள் விடைகளுடன் TN 9th Social Science HIS - Colonialism in Asia and Africa Important 1 Mark Questions with Answers 2,3,&5 Marks Questions with Answers.
Tamilnadu Stateboard 9th Standard Subjects
Tamilnadu Stateboard Standards
