9th Standard Syllabus & Materials
9th Standard
TN 9th Tamil உள்ளத்தின் சீர் -கற்கண்டு (இலக்கணம்) - தொடர் இலக்கணம், ஆகுபெயர் Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உள்ளத்தின் சீர் -விரிவானம் (துணைப்பாடம்) - தாய்மைக்கு வறட்சி இல்லை! Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உள்ளத்தின் சீர் -கவிதை பேழை (செய்யுள்) - மார்கழி பெருவிழா Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உயிருக்கு வேர்-இலக்கணம் - பகுபத உறுப்பிலக்கணம் Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil அமுதென்று பேர் - இலக்கணம்-எழுத்து -அளபெடை Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil அமுதென்று பேர்-துணைப்பாடம் - ஆறாம்திணை Important Questions And Answers Study Material - QB365 Set A
Published on: 15/06/2021
QB365 provides detailed and simple solution for every Book back Questions in class 9 Science Subject. It will helps to get more idea about question pattern in every book back questions with solution.
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.
What is neutralization reaction? Give an example.
2.
Find the odd one out: Lemon juice, Tomato juice, House hold ammonia, Coffee
3.
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.
(i) Find out the acid A and acid B.
(ii) Which acid is called the King of Chemicals?
4.
What are the various uses of Aquaregia.
5.
Write any four uses of acids.
1.
Bases react with acid to form salt and water. This reaction is called as Neutralisation reaction.
Eg: \(\underset {Base}{(KOH)} + \underset {(Acid)}{HCl} \longrightarrow \underset {(Salt)}{KCl} + H_2O\)
2.
House hold ammonia - since its pH value is greater than 7. It is basic in nature. Whereas other three are acidic in nature as their pH values are lesser than 7.
Note pH
Lemon juice -2.2 - 2.4
Tomato juice - 4.0 - 4.4
Coffee - 4.4 - 5.5
Household ammonia - 12.0
3.
(i) Acid A - HCl -Hydrochloric acid. Acid B - H2SO4 - Sulphuric acid.
(ii) Sulphuric acid - H2SO4
4.
1. It is used chiefly to dissolve metals such as gold and platinum.
2. It is used for cleaning and refining gold.
5.
Uses of acids:
(i) Hydrochloric acid is used as a cleansing agent in toilets.
(ii) Citric acid is used in the preparation of effervescent salts and as a food preservative.
(iii) Nitric acid is used in the manufacture of fertilizers, dyes, paints and drugs.
(iv) Carbonic acid is used in aerated drinks.
9th Standard Syllabus & Materials
9th Standard
TN 9th Tamil உள்ளத்தின் சீர் - திருக்குறள் Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உள்ளத்தின் சீர் - மணிமேகலை Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உள்ளத்தின் சீர் - ஏறு தழுவுதல் Important Questions And Answers Study Material - QB365 Set A
NEW9th Standard
TN 9th Tamil உயிருக்கு வேர் - தண்ணீர் Important Questions And Answers Study Material - QB365 Set A
Tamilnadu Stateboard 9th Standard Subjects
Tamilnadu Stateboard Standards
