Education
Class 10 Chemistry Chapter 24 Carboxylic Acids Test 1 & Full Unit Test PDF | Punjab Board 2027
Grade 10 Chemistry Chapter 24 Carboxylic Acids Test 1
Prepare for the Class 10 Chemistry Chapter 24: Carboxylic Acids examination with our Punjab Board 2027 Model Papers. This chapter-wise test series includes Class Test 1 and a Full Unit Test, designed according to the new syllabus issued by PECTAA Punjab. These Class 10 Chemistry Chapter 24 test papers help students revise important concepts, practise exam-style questions, and prepare effectively for Punjab Board examinations. Students can use these Chemistry chapter-wise tests to strengthen their preparation for the 2027 exams.
786Times
786Times
786Times
786Times
786Times
786Times
786Times
786Times
786Times
CHEMISTRYCHAPTER-24 (OBJECTIVE)CLASS TEST-1
1. Carboxylic acid contain functional group:
(a) –OH(b) –COOH(c) –||C–O(d) –CHO
Ans: (b) –COOH
2. In 24 hours, vinegar containing ethanoic acid by fermentation process:
(a) 12%(b) 13%(c) 14%(d) 15%
Ans: (d) 15%
3. Vinegar is an aqueous solution of
(a) Ethanol(b) Ethanoic acid(c) Methanoic acid(d) HCl
Ans: (b) Ethanoic acid
4. Reaction of ethanoic acid with sodium hydroxide is an example of:
(a) Neutralization(b) Oxidation(c) Reduction(d) Decomposition
Ans: (a) Neutralization
5. Formula of marble chips is:
(a) CaO(b) CaCO3(c) CH3COOH(d) Na2CO3
Ans: (b) CaCO3
6. Acetic acid is used in industry mainly as a solvent for:
(a) Fertilizers(b) Medicines(c) Lacquers(d) Iodine tincture
Ans: (c) Lacquers
7. The sour taste of food is due to:
(a) Mineral salt(b) Alcohol(c) Organic acid(d) Sulphuric acid
Ans: (c) Organic acid
8. Pure acetic acid is called
(a) Glacial acetic acid(b) Maltate(c) Glacial maleic acid(d) Acetate
Ans: (a) Glacial acetic acid
9. Which medicines is obtained from carboxylic acids?
(a) Paracetamol(b) Penicillin(c) Insulin(d) Aspirin
Ans: (d) Aspirin
10. Polymethyl methacrylate is commonly known as:
(a) Polyester(b) Nylon(c) Plexiglass(d) Bakelite
Ans: (c) Plexiglass
786Times
786Times
786Times
786Times
786Times
786Times
CHEMISTRYCHAPTER-24 (SUBJECTIVE)CLASS TEST-1
i. What is carboxylic acid? Give example.
Ans: An organic compound containing the carboxyl group (–COOH) is called a carboxylic acid. Example: ethanoic (acetic) acid, CH3COOH.
ii. What types of substance can be converted to vinegar?
Ans: Substances containing sugar, starch or ethanol, e.g. fruit juices (apple, grapes), malt, molasses and dilute ethanol solutions.
iii. Why is liquid stirred continuously during fermentation?
Ans: To mix air (oxygen) well into the liquid so that the bacteria can oxidise ethanol to ethanoic acid quickly and evenly.
iv. Write a chemical reaction of carboxylic acid with carbonates or what is observed when ethanoic acid reacts with sodium carbonate?
Ans: 2CH3COOH + Na2CO3 → 2CH3COONa + H2O + CO2↑
Brisk effervescence is observed due to release of CO2 gas, which turns lime water milky.
Brisk effervescence is observed due to release of CO2 gas, which turns lime water milky.
v. How ester formed? Give equation.
Ans: A carboxylic acid reacts with an alcohol in the presence of conc. H2SO4:
CH3COOH + C2H5OH ⇌ CH3COOC2H5 + H2O
CH3COOH + C2H5OH ⇌ CH3COOC2H5 + H2O
vi. Write the industrial use of ethyl acetate.
Ans: Used as a solvent in paints, lacquers, nail-polish removers and perfumes, and for artificial fruit flavours.
vii. Write the application of organic acid in food industry.
Ans: Organic acids (citric, acetic, tartaric etc.) are used as preservatives, to give sour taste and flavour in pickles, soft drinks, sauces and sweets.
viii. Write the uses of Palmitic and Stearic acid.
Ans: Used in making soaps, candles, detergents, cosmetics and lubricants.
ix. Write the properties of glacial acetic acid (Interesting Information)
Ans: Pure (100%) acetic acid; colourless liquid with pungent smell; freezes at about 16.6 °C into ice-like crystals; miscible with water; corrosive.
x. Why are food preservatives added to food?
Ans: To stop the growth of bacteria and fungi, prevent spoilage and increase the shelf life of food.
xi. What is Plexiglass?
Ans: Plexiglass is polymethyl methacrylate (PMMA), a transparent, light and strong plastic used instead of glass.
SECTION-II
1. What is an esterification reaction?(Ex. B. 24.1)
Ans: The reaction of a carboxylic acid with an alcohol in the presence of conc. H2SO4 to form an ester and water.
2. Why sufficient oxygen is provided during fermentation to prepare acetic acid from ethanol?(Ex. B. 24.3)
Ans: Ethanol is oxidised to ethanoic acid by bacteria that need oxygen:
CH3CH2OH + O2 → CH3COOH + H2O
CH3CH2OH + O2 → CH3COOH + H2O
