⚗️ Chemical Engineering Solved MCQs with Answers

Practice 1920 approved ⚗️ Chemical Engineering questions with verified answers from the 🛠️ Engineering Essentials subject for Pakistan exams.

1920 solved MCQs

How many active sets of electrons are present in the central atom of H₂O?Answer: 4 Grignard's reagent reacts with CO₂ to form?Answer: Carboxylic acid In diamond, each carbon atom is covalently bonded with four other carbon atoms at an angle of ______?Answer: 109.5° What is the hybridization of carbon in methanol (CH₃OH)?Answer: sp³ 1 Atomic Mass Unit is equal to ______?Answer: 1.66 × 10⁻²⁸ g The study of motion of body is called :Answer: Mechanics What is the classification of Sulphur?Answer: Non-metal French polish isAnswer: Oil paint In a constant level tube size of the bubble renains constant because upper wall isAnswer: Of relatively larger radius Which substrate reacts fastest in Sn₂ reaction?Answer: Methyl bromide Hess’s law is used to calculate enthalpy because enthalpy is?Answer: State function Products of ozonolysis of propene are?Answer: Ethanal and methanal Alkyl benzene is converted into benzoic acid using?Answer: KMnO₄, acidified Gabriel phthalimide synthesis is used for preparation of?Answer: 1° amine Concentration of B changes but rate remains unchanged. Correct equation?Answer: r = [A]₂[B]₀ Reagent used for reduction of nitrobenzene to aniline is?Answer: Fe/HCl For endothermic reaction, when is it spontaneous?Answer: ΔG = −ve Which quantum number set is not applicable? n = 3, l = 3, m = 2, s = 1/2, n = 4, l = 2, m = 0, s = -1/2, n = 3, l = 2, m = 1, s = +1/2, n = 2, l = 1, m = 0, s = -1/2Answer: n = 3, l = 3, m = 2, s = 1/2 N= 4, l = 2, number of electrons will be?Answer: 10 Which gas effuses faster? O₂, H₂, CO₂, N₂Answer: H₂ What will increase the vapour pressure in liquid–vapour equilibrium?Answer: Increase temperature Boiling point of water is higher than H₂S due to?Answer: Hydrogen bonding Which statement describes a supercritical fluid? It behaves only as a solid, It has fixed shape and volume, No boundary exists between gas and liquid phases, None of theseAnswer: No boundary exists between gas and liquid phases Which species contains a 3-center 2-electron bond?Answer: Diborane (B₂H₆) ΔH = −40 kJ mol₁⁻, ΔS = −100 J mol₁⁻ K₁⁻. Above which temperature does reaction become non-spontaneous?Answer: 400 K On dilution of strong electrolyte solution?Answer: Molar concentration decreases, specific conductivity decreases Nernst equation electrode potential depends on?Answer: Concentration and temperature Bond order of O₂⁺ is?Answer: 2.5 Reaction is spontaneous at constant T and P if?Answer: ΔG < 0 Leaving group in nucleophilic acyl substitution of ethanoyl chloride is? OH⁻, Cl⁻, CH₃⁻, None of theseAnswer: Cl⁻