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Class 10 Chemistry Chapter 24 Carboxylic Acids Test 4 PDF | Punjab Board 2027 Model Papers
Grade 10 Chemistry Chapter 24 Carboxylic Acids Test 4
Prepare for your Class 10 Chemistry Chapter 24: Carboxylic Acids examination with the latest Punjab Board 2027 Model Papers, prepared according to the new syllabus issued by PECTAA Punjab. This study resource includes Class Test 4, Full Unit Test, and Chapter-Wise Test Series to help students revise important concepts, practise exam-style questions, and improve their preparation for the Class 10 Chemistry board examination. Download the Chemistry Chapter 24 test papers in PDF format for effective practice and revision.
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Chapter: 24
Total Time: 35 min
CHAPTER WISE CLASS TEST
(Test # 4)
Chemistry
Total Marks: 25
ABCD
1ABCD
2ABCD
3ABCD
ABCD
4ABCD
5ABCD
6ABCD
ABCD
7ABCD
8ABCD
NOTE: Four possible answers A, B, C and D to each question are given. The choice which you think is correct, fill that circle in front of that question with Marker or Pen ink. Cutting or filling two or more circles will result in zero mark in that question.
TIME: 10 Min
OBJECTIVE
MARKS: 8
Q.1:(08)
1.
Which substances will react to produce CH3 – CH2 – CH2 – COOC2H5?
(A) CH3CH2CH2COOH and CH3OH(B) CH3CH2COOH and CH3CH2OH(C) CH3CH2CH2COOH and CH3CH2OH(D) CH3CH2CH2COOH and CH3OH
Ans: (C) Butanoic acid + ethanol → ethyl butanoate (ester) + water
2.
The sour taste of foods due to the presence of :
(A) Salts(B) Organic acids(C) Sugars(D) Proteins
Ans: (B) Organic acids
3.
What is the formula of ester formed by the reaction of methanol with propanoic acid?
(A) CH3COOCH2CH3(B) CH3CH2COCH2(C) CH3CH2COOCH3(D) CH3CH2OCOCH3
Ans: (C) CH3CH2COOCH3 (methyl propanoate)
4.
Cellulose acetate plastic is produced using:
(A) Sulphuric acid(B) Acetic acid(C) Nitric acid(D) Hydrochloric acid
Ans: (B) Acetic acid
5.
Which polymer is made by reacting a diol and a dicarboxylic acid?
(A) Polyethene(B) Polyester(C) Polystyrene(D) Polyamide
Ans: (B) Polyester
6.
Which ester gives apple flavour?
(A) Ethyl butyrate(B) n-Amyl acetate(C) Methyl butyrate(D) n-Octyl acetate
Ans: (C) Methyl butyrate
7.
Which compound is used as a synthetic fiber?
(A) Methyl acetate(B) Polyester(C) Resin(D) n-Amyl
Ans: (B) Polyester
8.
Which ester gives apricot flavour?
(A) n-Octyl acetate(B) Methyl butyrate(C) Ethyl butyrate(D) Methyl salicylate
Ans: (C) Ethyl butyrate
TIME: 25 Min
SUBJECTIVE
MARKS: 17
(PART – I)
Q.2 Write short answers to following questions.(6×2=12)
i.
Which carboxylic acids are very oftenly used as flavour enhancers?
Ans: Citric acid, tartaric acid and malic acid (organic acids) are often used as flavour enhancers.
ii.
How do ethanol and propanoic acid react?
Ans: They react in the presence of conc. H2SO4 (esterification) to form ethyl propanoate and water:
CH3CH2COOH + C2H5OH ⇌ CH3CH2COOC2H5 + H2O
CH3CH2COOH + C2H5OH ⇌ CH3CH2COOC2H5 + H2O
iii.
Which property of acetic acid does make it suitable to act as preservative in pickle?
Ans: Its acidic nature: it lowers the pH and stops the growth of bacteria and fungi, so the pickle does not spoil.
iv.
What is polyester and how is it formed?
Ans: Polyester is a polymer with many ester links (–COO–). It is formed when a diol reacts with a dicarboxylic acid, repeatedly joining by esterification and releasing water. Example: Terylene (PET).
v.
How does ethanol react with propanoic acid?
Ans: In the presence of conc. H2SO4 as catalyst they form the ester ethyl propanoate and water:
CH3CH2COOH + C2H5OH ⇌ CH3CH2COOC2H5 + H2O
CH3CH2COOH + C2H5OH ⇌ CH3CH2COOC2H5 + H2O
vi.
Give examples of some citrous fruits and the acid they contain.
Ans: Lemon and orange contain citric acid; grapefruit contains citric acid; (grapes contain tartaric acid, apples malic acid).
(PART – II)
Note: Attempt the following question.
Q.3: Describe applications of esters in daily life.(5)
1. Flavours and fragrances: esters give fruity smells and tastes to food, drinks, sweets and perfumes (e.g. methyl butyrate – apple, n-octyl acetate – orange, n-amyl acetate – banana).
2. Solvents: ethyl acetate is used in nail polish remover, paints and lacquers.
3. Synthetic fibres and plastics: polyesters such as Terylene are used for clothes, ropes and PET bottles; cellulose acetate is used for plastics and films.
4. Medicines: methyl salicylate is used in pain-relief balms; aspirin is also an ester.
2. Solvents: ethyl acetate is used in nail polish remover, paints and lacquers.
3. Synthetic fibres and plastics: polyesters such as Terylene are used for clothes, ropes and PET bottles; cellulose acetate is used for plastics and films.
4. Medicines: methyl salicylate is used in pain-relief balms; aspirin is also an ester.
