SPSC - Lecturer Chemistry 2024 Past Paper with Answers

Practice the SPSC - Lecturer Chemistry 2024 past paper with 37 solved MCQs, answers and topic coverage.

37 solved MCQs across 1 approved paper

Based on the equations below, which metal is the most active? Pb(NO3)2 (aq) + Ni (s) → Ni(NO2)2 (aq) + Pb (s), Pb(NO3)2 (aq) + Ag (s) → No reaction, Cu(NO3)2 (aq) + Ag (s) → No reaction?Answer: Ni Which of the following statements is not true about precision of data?Answer: It is the difference between the obtained value and the true value Compound Z absorbs light of wavelength 320 nm. A 1.0 x 10^-3 mol dm^-3 solution of a compound Z gives an absorbance reading of 0.15 when placed in a solution cell path 1 cm. What is the value of the molar extinction (absorption) coefficient of Z?Answer: 150 mol^-1 dm^3 cm^-1 Polymers which soften on heating and harden when cooled are?Answer: Thermoplastics For second order reaction, the initial concentration of reactant A is 0.24 M. If the rate constant is 8.1 x 10^-2 M^-1 s^-1, what is the concentration of A after 29 seconds?Answer: 0.15 M In crystal field theory (CFT), the energy gap between t2g and eg sets is denoted by?Answer: 10Dq What is indicated when a chemical cell’s voltage has dropped to zero?Answer: The cell reaction has reached equilibrium Natural rubber consists of polymers of the organic compound?Answer: Isoprene Magnetic susceptibility (χ) measures on?Answer: Both A and C Which one of the following statements about the mass spectrum of CH3Br is correct?Answer: Last two peaks are of equal size at m/z values of 94 and 96 In a process at constant volume ΔE =_____?Answer: q The F-S-F bond angles in SF6 are?Answer: 90° and 180° The metal ions of transition metals are paramagnetic. The magnetic moment towards magnetic field is greatest of?Answer: Fe^+3 The co-ordination number and oxidation state of Cobalt in the given complex Na4[Co(C2O4)3] are respectively?Answer: 6 and +3 Which of the following molecule is polar and its dipole moment is 5.33 x 10⁻³⁰ Cm?Answer: SO₂ ‘He’ gas effuse from a hole of 10 dm^3 vessel in “5” seconds. The time for effusion of O2 from the same hole of 10 dm^3 will be?Answer: 14.1 seconds The cholesteryl - benzoate is?Answer: An example of liquid crystal The given reaction is the example of Free Radical Substitution CH₄ + Cl₂ → CH₃Cl + HCl. The order of this reaction is?Answer: First Automative antifreeze is a 60% weight/weight aqueous solution of ethylene glycol (C2H6O2) then its molality is?Answer: 24.2 moles/kg Only one pair of the liquid in the following set of solutions does not obey the Raoul’s Law. Identify it?Answer: Propanol and propanone The salt which is formed by neutralization of weak acid and weak base is?Answer: (NHl₄)₂ CO₃ 30 grams of acetic acid reacts with excess of ethyl alcohol to form 40 grams of ethyl acetate during esterification then percentage yield of ester is?Answer: 90.9% In chromatographic analysis the principle used is?Answer: Adsorption “Anti allergic medicines are also called antihistamines”. The histamine is a chemical produced in body due to the?Answer: Decarboxylation of amino acids Which substances are synthesized when ultraviolet radiations reaction with (CFCs) Chlorofluorocarbons and they result in the breakdown of ozone layer?Answer: Cl° and O° Which of the following process explain the process of tautomerism?Answer: None of these In the IR (infrared) spectrum of the carboxylic acid group, the C=O bond shows the peak-shaped band at the range of?Answer: 1710 cm⁻¹ The teacher said “The sun rises in the east”?Answer: The teacher said that the sun rises in the east Select the correct voice change: Could you help me, please?Answer: Could I be helped, please The king was determined to______the law.Answer: Enforce