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: 09/10/2019
Term 2 Acids, Bases and Salts
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.
Why do blue colour copper sulphate becomes white on heating?
2.
What is water of crystallisation?
3.
Why are tooth pastes basic?
4.
What are basic salts? Give suitable reaction for this
5.
What are double salts? Give an example?
6.
What is Potash alum? Write its formula
7.
What does acidity of base mean?
8.
What is Aquaregia? Mention its uses
9.
How are acids classified based on ionisation? Give examples.
10.
What are organic acids? Given examples?
1.
On heating blue colour copper sulphate loses its water molecules and becomes white.
2.
Many salts are found as crystals with water molecules they contain. These water molecules are known as water of crystallisation.
3.
Toothpastes which are generally basic and used for cleaning the teeth can neutralise the excess acid and prevent tooth decay.
4.
Basic salts are the product formed by the partial replacement of hydroxide ions of a diacidic or triacidic base with an acid radical.
Pb(OH)2+HClтЯ╢Pb(OH)Cl+H2O
5.
Double salts are the salts formed by the combination of the saturated solution of two simple salts in equimolar ratio followed by crystallization. For example: Potash alum.
6.
Potash alum is a mixture of potassium sulphate and aluminium sulphate
KAll(SO4)2·12H2O
7.
It means the number of replaceable hydroxyl groups present in one molecule of a base
8.
It is a mixture of hydrochloric acid and nitric acid prepared optimally in a molar ratio of 3: 1. It is a yellow-orange fuming liquid. It is a highly corrosive liquid, able to attack gold and other resistant substances.
i. Aquaregia is used to dissolve the noble metals such as gold, platinum and palladium.
ii. It is used for cleaning and refining gold.
9.
Acids get ionised in water (produce H+ ions) completely or partially. Based on the extent of ionisation acids are classified as follows:
Strong Acids:
These are acids that ionise completely in water. Example: HCl
Weak Acids:
These are acids that ionise partially in water. Example: CH3COOH
10.
Acids present in plants and animals (living things) are organic acids.
Example: HCOOH, CH3COOH
9th Standard Syllabus & Materials
9th Standard
TN 9роЖроорпН ро╡роХрпБрокрпНрокрпБ роЪроорпВроХ роЕро▒ро┐ро╡ро┐ропро▓рпН ро╡ро░ро▓ро╛ро▒рпБ - рокрогрпНроЯрпИроп роиро╛роХро░ро┐роХроЩрпНроХро│рпН роорпБроХрпНроХро┐ропрооро╛рой 2,3,&5 роородро┐рокрпНрокрпЖрогрпН ро╡ро┐ройро╛роХрпНроХро│рпН ро╡ро┐роЯрпИроХро│рпБроЯройрпН TN 9th Social Science HIS - Ancient . Civilisations Important 1 Mark Questions with Answers 2,3,&5 Marks Questions with Answers.
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
