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: 09/09/2019
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.
What are the uses of Plaster of Paris?
2.
What are the various uses of Aquaregia.
3.
Give the significance of pH of soil in agriculture.
4.
Sulphuric acid is called King of Chemicals. Why is it called so?
5.
Plaster of Paris should be stored in a moisture proof container. why?
6.
Why does distilled water not conduct electricity whereas rain water does?
7.
The hydrated salt of copper sulphate has______colour
Red
White
Blue
Pink
8.
You are given pure water to test the pH value using pH paper. It shows colour
White
black
green
black
9.
The nature of the tooth paste commonly used is in nature
acidic
basic
neutral
neutral
10.
pH value of human blood is_________
7.0
7.4
7.6
7.6
11.
Apple contains malic acid. Orange contains_______
citric acid
ascorbic acid
Tartaric acid
Oxalic acid
12.
Zn + 2HCl \(\longrightarrow \) ZnCl2 + ____\(\uparrow \)(H2' O2' CO2)
H2
O2
CO2
CO2
1.
Uses of Plaster of Paris:
(i) It is used for plastering bones.
(ii) It is used for making casts for statues.
2.
1. It is used chiefly to dissolve metals such as gold and platinum.
2. It is used for cleaning and refining gold.
3.
In agriculture, the pH of soil is very important. Citrus fruits require slightly alkaline soil, while rice requires acidic soil and sugarcane requires neutral soil.
4.
Sulphuric acid is called King of Chemicals because it is used in the preparation of many other compounds.
5.
Plaster of paris should be stored in a moisture-proof container as it absorbs water from moisture present in air and turn into hard substance (Gypsum).
6.
Distilled water can not conduct electricity. Because it does not contain ions whereas rain water conducts electricity as it contains ions due to presence of dissolved salt in it.
7.
(c)
Blue
8.
(c)
green
9.
(b)
basic
10.
(b)
7.4
11.
(b)
ascorbic acid
12.
(a)
H2
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
