NUMS MDCAT (Military Medical) Chemistry: Practice MCQs with Answers

NUMS MDCAT (Military Medical) Chemistry Practice sample MCQs

1. Q1. In a chemical plant producing methanol from water gas, the reaction is carried out at 450C and 200 atm. Which catalyst is utilized?

   • A) Fe2O3 and Al2O3
   • B) ZnO and Cr2O3
   • C) V2O5 and Pt
   • D) Ni and Pd

   Answer: ZnO and Cr2O3

2. Q2. A brewery uses molasses as a raw material for ethanol production. Which enzyme specifically converts sucrose into glucose and fructose during fermentation?

   • A) Diastase
   • B) Maltase
   • C) Invertase
   • D) Zymase

   Answer: Invertase

3. Q3. During the industrial synthesis of phenol via the Dow's process, chlorobenzene is reacted with 10% NaOH. What are the required temperature and pressure?

   • A) 360C and 150 atm
   • B) 450C and 200 atm
   • C) 250C and 100 atm
   • D) 500C and 300 atm

   Answer: 360C and 150 atm

4. Q4. To prevent the illegal consumption of industrial-grade ethanol, 10% methanol is added to it. What is the common name for this specific mixture?

   • A) Absolute alcohol
   • B) Rectified spirit
   • C) Power alcohol
   • D) Methylated spirit

   Answer: Methylated spirit

5. Q5. A laboratory requires 100% pure ethanol for a sensitive reaction. Which substance is used to remove the last traces of water from rectified spirit?

   • A) P2O5
   • B) CaO
   • C) Anhydrous CaCl2
   • D) Concentrated H2SO4

   Answer: CaO

6. Q6. In the energy sector, a mixture of 80% petrol and 20% alcohol is used as a fuel. Which alcohol is used in this 'power alcohol' mixture?

   • A) Ethanol
   • B) Methanol
   • C) Phenol
   • D) Ethylene glycol

   Answer: Ethanol

7. Q7. An industrial manufacturer produces Bakelite, a thermosetting plastic used for electrical switches. Which aldehyde is reacted with phenol to produce this resin?

   • A) Acetaldehyde
   • B) Benzaldehyde
   • C) Formaldehyde
   • D) Acetone

   Answer: Formaldehyde

8. Q8. A technician performs the Lucas test on a sample of 2-propanol. What observation would confirm the presence of this secondary alcohol in the lab?

   • A) Immediate oil layer formation
   • B) Oil layer formation after 5-10 minutes
   • C) Oil layer formation only on heating
   • D) No reaction regardless of temperature

   Answer: Oil layer formation after 5-10 minutes

9. Q9. During a chemical identification test, a student adds iodine and sodium hydroxide to an unknown alcohol, resulting in yellow crystals. Which alcohol is it?

   • A) Methanol
   • B) 1-Propanol
   • C) Phenol
   • D) Ethanol

   Answer: Ethanol

10. Q10. Phenol is often called carbolic acid. Which of the following reagents will react with phenol to demonstrate its acidic nature in a laboratory?

    • A) Sodium hydroxide
    • B) Sodium bicarbonate
    • C) Sodium carbonate
    • D) Sodium chloride

    Answer: Sodium hydroxide

11. Q11. In the production of explosives and dyes, Picric acid is synthesized from phenol. Which nitrating mixture is required for this specific reaction?

    • A) Dilute HNO3 at room temperature
    • B) Concentrated HNO3 and Concentrated H2SO4
    • C) NaNO2 and HCl at 0-5C
    • D) Nitrogen dioxide gas

    Answer: Concentrated HNO3 and Concentrated H2SO4

12. Q12. A mechanic adds a specific alcohol to an automobile radiator to prevent the cooling water from freezing in sub-zero temperatures. Which alcohol is used?

    • A) Methanol
    • B) Ethanol
    • C) Ethylene glycol
    • D) Glycerol

    Answer: Ethylene glycol

13. Q13. Formalin is used extensively in hospitals to preserve biological specimens. Which chemicals are the primary components of this solution, derived from methanol oxidation?

    • A) Methanol and CO2
    • B) Ethanol and Water
    • C) Acetaldehyde and Water
    • D) Formaldehyde and Water

    Answer: Formaldehyde and Water

14. Q14. In an organic synthesis lab, a researcher needs to convert phenol into benzene. Which reagent should be used for this reduction process?

    • A) Zinc dust
    • B) Sodium metal
    • C) Lithium aluminum hydride
    • D) Nickel and Hydrogen

    Answer: Zinc dust

15. Q15. A chemical engineer wants to produce diethyl ether by dehydrating ethanol with concentrated H2SO4. Which temperature must be maintained to maximize ether yield?

    • A) 170C
    • B) 140C
    • C) 100C
    • D) 200C

    Answer: 140C

16. Q16. The industrial synthesis of salicylic acid, a precursor to aspirin, involves reacting sodium phenoxide with CO2. What is the standard temperature for this Kolbe’s reaction?

    • A) Room temperature
    • B) 360C
    • C) 120-150C
    • D) 450C

    Answer: 120-150C

17. Q17. A student adds bromine water to an aqueous solution of phenol in a test tube. What is the characteristic observation for this reaction?

    • A) Reddish-brown liquid
    • B) Yellow precipitate
    • C) Colorless solution
    • D) White precipitate

    Answer: White precipitate

18. Q18. The dehydration of alcohols is catalyzed by

    • A) Acid
    • B) Base
    • C) Oxidizing agent
    • D) Reducing agent

    Answer: Acid

19. Q19. During the final stage of industrial ethanol production from starch, glucose is converted into ethanol. Which enzyme is responsible for this biochemical transformation?

    • A) Zymase
    • B) Diastase
    • C) Urease
    • D) Lactase

    Answer: Zymase

20. Q20. A researcher treats phenol with chloroform in the presence of aqueous sodium hydroxide at 60C. What is the major organic product of this Reimer-Tiemann reaction?

    • A) Benzoic acid
    • B) Salicylaldehyde
    • C) Salicylic acid
    • D) Catechol

    Answer: Salicylaldehyde

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