Class 10 Chemistry Chapter 23 Monohydroxy Alkanes or Alcohols Test 7 PDF | Punjab Board 2027
Grade 10 Chemistry Chapter 23 Monohydroxy Alkanes or Alcohols Test 7
Prepare for the Class 10 Chemistry Chapter 23: Monohydroxy Alkanes or Alcohols with the latest Punjab Board 2027 Model Papers. This chapter-wise test series includes Class Test 7 and a Full Unit Test, designed according to the new syllabus issued by PECTAA Punjab. These Class 10 Chemistry chapter-wise tests help students revise important concepts, assess their preparation, and practise for board examinations. Students can use these Punjab Board 2027 Chemistry test papers for effective revision and exam preparation.
1.Important member of monohydroxy alkanes is:
- (a) Methanol
- (b) Propanol
- (c) Methane
- (d) Ethanol
2.Which catalyst is used for the hydration of ethene in industrial scale?
- (a) H2SO4
- (b) H3PO4
- (c) H3PO3
- (d) HCl
3.Alcohol burn in air to produce:
- (a) CO and H2
- (b) C and H2O
- (c) CO2 and H2
- (d) CO2 and H2O
4.Burning of Alcohol does not produce.
- (a) CO2
- (b) water vapour
- (c) Heat
- (d) Oxides of sulphur
5.Ethanol is commonly used as:
- (a) Disinfectant
- (b) Fertilizer
- (c) Plastic
- (d) Fuel gas
6.Ethanol fuel reduce green house gas emission by:
- (a) 22–32%
- (b) 32–52%
- (c) 44–52%
- (d) 45–60%
7.Which conditions are considered best for the fermentation of glucose?
- (a) 35 °C, fresh yeast, absence of oxygen
- (b) 45 °C, yeast
- (c) 45 °C, absence of oxygen
- (d) 35 °C, fresh yeast
8.Which catalyst other than H3PO4 can also be used for hydration of alkenes?
- (a) NaOH
- (b) H2SO4
- (c) CH3COOH
- (d) Ni
9.Alcohol which has the maximum heat of combustion is:
- (a) CH3CH2CH2OH
- (b) CH3CH2OH
- (c) CH3OH
- (d) CH3CH2CH2CH2OH
10.The most environment friendly fuel is:
- (a) coal
- (b) kerosene oil
- (c) ethanol
- (d) wood
11.Which property of ethanol makes it suitable for cleaning wounds?
- (a) Good solvent
- (b) Volatility
- (c) Antiseptic
- (d) Deodorizing
12.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
Here is Subjective Part of Paper.
- Starch is first hydrolysed to glucose by the enzyme diastase/amylase.
- Glucose is changed to ethanol and carbon dioxide by zymase of yeast:
C6H12O6 → 2C2H5OH + 2CO2 - Conditions: about 35 °C, fresh yeast, absence of oxygen, 2–3 days.
- The product contains about 10–15% ethanol; fractional distillation gives about 95% ethanol.
CH2=CH2 + H2O → CH3CH2OH
- Conditions: 300 °C, 60–70 atm, H3PO4 (on silica) as catalyst.
- Continuous, fast process giving pure ethanol; ethene comes from petroleum (non-renewable).
- Unreacted ethene is recycled.
- Raw material: fermentation – sugar/starch (renewable); hydration – ethene (non-renewable).
- Rate: fermentation – slow; hydration – fast.
- Process: fermentation – batch; hydration – continuous.
- Purity: fermentation – impure (10–15%); hydration – very pure.
- Conditions: fermentation – 35 °C, yeast, no air; hydration – 300 °C, 60–70 atm, H3PO4.
- Cost/equipment: fermentation – simple and cheap; hydration – costly plant.
C2H5OH + 3O2 → 2CO2 + 3H2O + heat
2CH3OH + 3O2 → 2CO2 + 4H2O + heat
- Burn with a clean, blue, smokeless flame; no oxides of sulphur are produced.
- Heat of combustion increases from methanol to butanol as the chain gets longer.
- Energy is released because strong O–H and C=O bonds form in the products.
- Pharmaceutical: solvent for drugs, cough syrups and tinctures; antiseptic/disinfectant for wounds and skin; preservative; used to make chloroform and ether.
- Cosmetic: solvent and carrier in perfumes, deodorants, hair sprays, aftershave, lotions and nail polish; antibacterial and quick drying (volatile).
- Fuel: ethanol is blended with petrol (gasohol); spirit lamps and stoves use methylated spirit.
- Solvent: paints, varnishes, polishes, inks.
- Medicine and hygiene: antiseptics, hand sanitizers, disinfectants.
- Industry: raw material for vinegar, esters, ether and other organic compounds.
- Environment: ethanol fuel reduces greenhouse gas emission and pollutants.
- Warning: methanol is poisonous, and drinking alcohol harms health.
