UET Lahore ECAT Chemistry: Past Papers MCQs with Answers

Practise UET Lahore ECAT Chemistry past papers MCQs in sets of about 20 questions with instant answers and explanations. This page focuses on questions drawn…

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UET Lahore ECAT Chemistry Past Papers sample MCQs

  1. Q1. The number of sigma bonds in CH4 is

    • A) 4
    • B) 3
    • C) 2
    • D) 1

    Answer: 4

  2. Q2. For the reaction 2A ⇌ B, if KC = 4, then for A ⇌ 1/2B, KC' is

    • A) 2
    • B) √4
    • C) 4²
    • D) 1/2

    Answer: √4

  3. Q3. The molar volume of an ideal gas at 1 atm and 0°C is

    • A) 22.4 L
    • B) 11.2 L
    • C) 20 L
    • D) 24 L

    Answer: 22.4 L

  4. Q4. The number of π bonds in benzene is

    • A) 3
    • B) 4
    • C) 5
    • D) 6

    Answer: 3

  5. Q5. Which nucleotide is NOT a component of DNA?

    • A) dATP
    • B) dGTP
    • C) dCTP
    • D) UTP

    Answer: UTP

  6. Q6. The molecule that exhibits resonance is?

    • A) CO2
    • B) H2O
    • C) O3
    • D) CH4

    Answer: O3

  7. Q7. The bond length of O-O in O2 is?

    • A) 1.21 A
    • B) 1.48 A
    • C) 1.34 A
    • D) 1.54 A

    Answer: 1.21 A

  8. Q8. The molecule that is most likely to be paramagnetic is

    • A) O2
    • B) N2
    • C) CO
    • D) NO+

    Answer: O2

  9. Q9. The element that forms a peroxide when heated in air is

    • A) Li
    • B) Na
    • C) K
    • D) Rb

    Answer: Na

  10. Q10. The noble gas used in lasers is?

    • A) Neon
    • B) Argon
    • C) Krypton
    • D) Xenon

    Answer: Krypton

  11. Q11. The freezing point depression of a 0.1 m solution of glucose is?

    • A) 0.186 K
    • B) 0.372 K
    • C) 0.558 K
    • D) 0.744 K

    Answer: 0.186 K

  12. Q12. For a certain reaction, ΔH = 0 and ΔS = 0.1 kJ/K. At what temperature is ΔG = -10 kJ?

    • A) 100 K
    • B) 1000 K
    • C) 500 K
    • D) 2000 K

    Answer: 100 K

  13. Q13. The reaction of diethyl ether with HCl gives?

    • A) Ethyl chloride
    • B) Ethanol
    • C) Both A and B
    • D) None of the above

    Answer: Both A and B

  14. Q14. The reaction of ROH with PX₃ gives

    • A) RX
    • B) RCOOH
    • C) RCHO
    • D) None of these

    Answer: RX

  15. Q15. Which molecule has the largest bond angle?

    • A) CH4
    • B) NH3
    • C) H2O
    • D) CO2

    Answer: CO2

  16. Q16. The Williamson synthesis is used to prepare

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

    Answer: Ethers

  17. Q17. The product of the reaction of ethanol with H2SO4 at 443 K is

    • A) C2H5OC2H5
    • B) CH3CHO
    • C) C2H4
    • D) CH3COOH

    Answer: C2H4

  18. Q18. The compound that does not give iodoform test is

    • A) CH3CH2OH
    • B) C2H5OH
    • C) (CH3)2CHOH
    • D) C6H5CH2OH

    Answer: C6H5CH2OH

  19. Q19. The reaction of phenol with conc. HNO3 is an example of

    • A) Electrophilic substitution
    • B) Nucleophilic substitution
    • C) Elimination reaction
    • D) Addition reaction

    Answer: Electrophilic substitution

  20. Q20. The product of the reaction of diethyl ether with HI is

    • A) C2H5I
    • B) C2H5OH
    • C) Both A and B
    • D) None of the above

    Answer: Both A and B

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