8th Standard Syllabus & Materials
8th Standard
Tamilnadu 8th Standard கணிதம் இயற்கணிதம் Important Questions And Answers Study Material - QB365
NEW8th Standard
Tamilnadu 8th Standard கணிதம் எண்கள் Important Questions And Answers Study Material - QB365 Set B
NEW8th Standard
Tamilnadu 8th Standard கணிதம் எண்கள் Important Questions And Answers Study Material - QB365 Set A
NEW8th Standard
Tamilnadu 8th Standard Social Science பொருளியல் - பொது மற்றும் தனியார் துறைகள் Important Questions And Answers Study Material - QB365
NEW8th Standard
Tamilnadu 8th Standard Social Science குடிமையியல் - நீதித்துறை Important Questions And Answers Study Material - QB365
NEW8th Standard
Tamilnadu 8th Standard Social Science குடிமையியல் - பாதுகாப்பு மற்றும் வெளியுறவுக் கொள்கை Important Questions And Answers Study Material - QB365
Published on: 13/05/2022
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latest Book back QuestionsDownload Tamil Nadu 8th 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.
Define acid.
2.
What are the similarities between acids and bases?
3.
State the difference between acids and bases.
4.
What is an indicator?
5.
Write any four physical properties of base.
1.
Acids are defined as the chemical substances which release hydrogen ions when dissolved in water.
2.
i) They are corrosive in nature.
ii) They undergo ionization in aqueous solution.
iii) They conduct electricity in aqueous solution.
iv) They undergo neutralization reaction.
3.
| Acids | Bases |
| They produce H+- ions in water. | They produce OH- ions in water |
| They are sour in taste | They are bitter in taste |
| Few acids are in solid state | Most of the bases are in solid state |
| Acids turn blue litmus paper red | Bases turn red litmus paper blue |
4.
An indicator or acid-base indicator is a chemical substance which indicates the acidic or basic nature of a solution by suitable colour change. They may be natural or synthetic.
5.
(i) Bases generally exist in solid state but some bases exist in liquid state also. E.g. Ammonium hydroxide, Calcium hydroxide.
(ii) Bases give soapy touch only in aqueous media not in dry nature.
(iii) Bases are bitter in taste.
(iv) Bases are corrosive in nature. When they come in contact with the skin frequently they form painful blisters.
(v) Bases are generally colourless.
(vi) Bases also change the colour of the indicators. Red litmus paper turns blue when treated with bases. Similarly they turn methyl orange yellow and phenolphthalein pink
(vii) Bases also conduct electricity in aqueous solution
8th Standard Syllabus & Materials
8th Standard
Tamilnadu 8th Standard Social Science புவியியல் - புவிப்படங்களைக் கற்றறிதல் Important Questions And Answers Study Material - QB365
NEW8th Standard
Tamilnadu 8th Standard Social Science புவியியல் - கண்டங்களை ஆராய்தல் (ஆப்பிரிக்கா, ஆஸ்திரேலியா மற்றும் அண்டார்டிகா) Important Questions And Answers Study Material - QB365
NEW8th Standard
Tamilnadu 8th Standard Social Science புவியியல் - தொழிலகங்கள் Important Questions And Answers Study Material - QB365
NEW8th Standard
Tamilnadu 8th Standard Social Science வரலாறு - காலங்கள் தோறும் இந்தியப் பெண்களின் நிலை Important Questions And Answers Study Material - QB365
Tamilnadu Stateboard 8th Standard Subjects
Tamilnadu Stateboard Standards
