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Class 10 Chemistry Chapter 23 Test 4 PDF Download | Monohydroxy Alkanes (Alcohols) | Punjab Board 2027
Grade 10 Chemistry Chapter 23 Monohydroxy Alkanes or Alcohols Test 4
Prepare for your Class 10 Chemistry Chapter 23 Test 4 with our Punjab Board 2027 Model Papers test series. This test covers Monohydroxy Alkanes (Alcohols) and includes a full unit test with textbook exercises to help students prepare for their Chemistry examinations according to the new syllabus issued by PECTAA Punjab. Download the Class 10 Chemistry chapter-wise test PDF for practice, revision, and board exam preparation.
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Chapter: 23
Total Time: 35 min
CHAPTER WISE CLASS TEST
(Test # 4)
Chemistry
Total Marks: 25
ABCD
1ABCD
2ABCD
3ABCD
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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 MinOBJECTIVEMARKS: 8
Q.1:(08)
1.Which property or properties of ethanol make it suitable to be used in cosmetic industry?
(A) Easily Flammable(B) Highly volatile and deodorizing(C) Antipyretic(D) Sedative
Answer: (B) Highly volatile and deodorizing
2.The heat of combustion of methanol is:
(A) -1367 kJ/mol(B) -2017 kJ/mol(C) -726 kJ/mol(D) -2676 kJ/mol
Answer: (C) -726 kJ/mol
3.Which is the correct name of the following alcohol:
(A) 2-Methylpentan-4-ol(B) 4-Methylpentan-2-ol(C) Hexan-2-ol(D) Hexan-4-ol
CH3–CH–CH2–CH–CH3OHCH3
Answer: (B) 4-Methylpentan-2-ol – the longest chain has 5 carbons, numbered from the end nearest the –OH group (OH on C-2, methyl on C-4).
4.As we go from methanol to butanol, the heat of combustion:
(A) Decreases(B) Remains same(C) Increases(D) First increases then decreases
Answer: (C) Increases
5.Which property of ethanol makes it suitable for cleaning wounds?
(A) Good solvent(B) Volatility(C) Antiseptic(D) Deodorizing
Answer: (C) Antiseptic
6.Alcohols have higher fuel efficiency as compared to:
(A) Natural gas(B) Petrol or diesel fuels(C) Coal(D) Nuclear energy
Answer: (B) Petrol or diesel fuels (as per the textbook statement).
7.Which alcohol is used to accomplish all the following tasks:
It is added in petrol to improve combustion. It serves as a feed stock to prepare vinegar and many other organic compounds.
(A) Propanol(B) Propan-2-ol(C) Ethanol(D) Methanol
Answer: (C) Ethanol – blended with petrol and oxidised to ethanoic acid (vinegar).
8.Ethanol and isopropanol help to:
(A) Dissolve many drugs(B) Destroy drugs(C) Increase drug toxicity(D) Decrease drug effectiveness
Answer: (A) Dissolve many drugs
TIME: 25 MinSUBJECTIVEMARKS: 17
(PART – I)
Q.2Write short answers to following questions.(6×2=12)
i.Give any two disadvantages of fermentation reactions.
- It is a slow process that takes several days.
- It gives dilute, impure ethanol (only about 12–15%) that needs distillation; it is a batch process.
ii.How does heat of combustion change in alcohol homologous series?
It increases as the number of carbon atoms increases (about 650 kJ/mol for each additional CH2): methanol 726, ethanol 1367, propanol 2017, butanol 2676 kJ/mol.
iii.Write the conditions involved in the hydration of ethene.
Ethene and steam, H3PO4 catalyst, temperature about 300°C and pressure about 60–70 atm.
iv.Give two disadvantages of using alcohols as fuels.
- Lower energy content than petrol, so more fuel is needed for the same distance.
- Growing crops for fuel competes with food and land; alcohol absorbs water and can corrode engine parts.
v.Why do we get relatively impure alcohol in the fermentation process?
The yeast stops working at about 12–15% ethanol, so the product is a dilute mixture with water, yeast and by-products (such as aldehydes, acids and fusel oil), which must be removed by distillation.
vi.Write general formula of alcohol.
CnH2n+1OH (or R–OH).
(PART – II)
Note: Attempt the following question.
Q.3:Describe the applications of ethanol in pharmaceutical and cosmetic Industries?(5)
Pharmaceutical: good solvent for drugs, tinctures, cough syrups and extracts (ethanol and isopropanol dissolve many drugs); antiseptic and disinfectant for cleaning wounds, skin and instruments (hand sanitizers); preservative in medicines.
Cosmetic: solvent for fragrances in perfumes, deodorants and after-shave lotions; highly volatile, so it evaporates quickly with a cooling and deodorizing effect; used in hair sprays, creams and nail polish removers.
Cosmetic: solvent for fragrances in perfumes, deodorants and after-shave lotions; highly volatile, so it evaporates quickly with a cooling and deodorizing effect; used in hair sprays, creams and nail polish removers.
