HEC USAT-E (Pre-Engineering) Chemistry: Most Important MCQs with Answers

Practise HEC USAT-E (Pre-Engineering) Chemistry most important MCQs in sets of about 20 questions with instant answers and explanations. This page focuses on…

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HEC USAT-E (Pre-Engineering) Chemistry Most Important sample MCQs

  1. Q1. The number of moles of solute in 1 L of 1 M solution is

    • A) 0.5
    • B) 1
    • C) 1.5
    • D) 2

    Answer: 1

  2. Q2. A lake has a pH of 6. What is the pOH?

    • A) 8
    • B) 6
    • C) 7
    • D) 5

    Answer: 8

  3. Q3. The element that is a liquid at room temperature is:

    • A) Hg
    • B) Br2
    • C) Ga
    • D) Cs

    Answer: Br2

  4. Q4. Which of the following is the strongest acid?

    • A) C6H5OH
    • B) p-NO2C6H4OH
    • C) p-CH3C6H4OH
    • D) C2H5OH

    Answer: p-NO2C6H4OH

  5. Q5. The reaction of phenol with NaOH gives

    • A) Sodium phenoxide
    • B) Sodium phenolate
    • C) Both A and B
    • D) None of these

    Answer: Both A and B

  6. Q6. The Williamson ether synthesis involves

    • A) SN1 reaction
    • B) SN2 reaction
    • C) Electrophilic addition
    • D) Free radical substitution

    Answer: SN2 reaction

  7. Q7. The boiling point of ethers is lower than their isomeric alcohols due to

    • A) Hydrogen bonding
    • B) Lack of hydrogen bonding
    • C) High molecular weight
    • D) Low molecular weight

    Answer: Lack of hydrogen bonding

  8. Q8. The reaction of alcohols with Lucas reagent is an example of

    • A) SN1 reaction
    • B) SN2 reaction
    • C) Electrophilic substitution
    • D) Nucleophilic substitution

    Answer: SN1 reaction

  9. Q9. The major product of the reaction of 1-propanol with PBr3 is

    • A) 1-Bromopropane
    • B) 2-Bromopropane
    • C) Propene
    • D) 1,2-Dibromopropane

    Answer: 1-Bromopropane

  10. Q10. Phenol is more acidic than

    • A) Ethanol
    • B) Methanol
    • C) Both A and B
    • D) None of these

    Answer: Both A and B

  11. Q11. The reaction of phenol with bromine water gives

    • A) 2,4,6-Tribromophenol
    • B) 2,4-Dibromophenol
    • C) p-Bromophenol
    • D) o-Bromophenol

    Answer: 2,4,6-Tribromophenol

  12. Q12. Diethyl ether is prepared by

    • A) Williamson synthesis
    • B) Dehydration of ethanol
    • C) Reaction of ethyl chloride with NaOH
    • D) Reaction of ethyl chloride with sodium ethoxide

    Answer: Dehydration of ethanol

  13. Q13. The order of reactivity of alcohols towards sodium is

    • A) Primary > Secondary > Tertiary
    • B) Tertiary > Secondary > Primary
    • C) Secondary > Primary > Tertiary
    • D) Primary > Tertiary > Secondary

    Answer: Primary > Secondary > Tertiary

  14. Q14. The reaction of anisole with HI gives

    • A) Phenol and methyl iodide
    • B) Phenol and ethyl iodide
    • C) Benzene and methanol
    • D) Toluene and HI

    Answer: Phenol and methyl iodide

  15. Q15. The dehydration of alcohols is catalyzed by

    • A) H2SO4
    • B) HCl
    • C) H3PO4
    • D) All of the above

    Answer: All of the above

  16. Q16. The reaction of phenol with chloroform and NaOH gives

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

    Answer: Salicylaldehyde

  17. Q17. The oxidation of secondary alcohols gives

    • A) Aldehydes
    • B) Ketones
    • C) Carboxylic acids
    • D) Ethers

    Answer: Ketones

  18. Q18. The reaction of alcohols with carboxylic acids gives

    • A) Ethers
    • B) Esters
    • C) Aldehydes
    • D) Ketones

    Answer: Esters

  19. Q19. The compound that is most reactive towards Lucas reagent is

    • A) Primary alcohol
    • B) Secondary alcohol
    • C) Tertiary alcohol
    • D) Phenol

    Answer: Tertiary alcohol

  20. Q20. The best method for preparing unsymmetrical ethers is

    • A) Dehydration of alcohols
    • B) Williamson synthesis
    • C) Reaction of alkoxides with alkyl halides
    • D) Both B and C

    Answer: Both B and C

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