Welcome to Schoolngr.com

Search SchoolNGR

Wednesday, 05 August 2026
Register . Login

Chemistry Past Questions and Answers

Chemistry Questions

Question 236:
JAMB 1981
The products of the reaction between dilute sulphuric acid and sodium thiosulphate crystals are?
SchoolNGR Classroom
  • A Na<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> + SO<sub style='font-size: smaller;'>2</sub> + O<sub style='font-size: smaller;'>2</sub> + H<sub style='font-size: smaller;'>2</sub>O
  • B Na<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>3</sub> + SO<sub style='font-size: smaller;'>3</sub> + O<sub style='font-size: smaller;'>2</sub> + H<sub style='font-size: smaller;'>2</sub>O
  • C Na<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> + SO<sub style='font-size: smaller;'>2</sub> + S + H<sub style='font-size: smaller;'>2</sub>O
  • D Na<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> + SO<sub style='font-size: smaller;'>3</sub> + S + H<sub style='font-size: smaller;'>2</sub>O
  • E Na<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> + SO<sub style='font-size: smaller;'>2</sub> + H<sub style='font-size: smaller;'>2</sub>O only
View Answer & Explanation
Question 237:
JAMB 1981
Which of the following is NOT a true statement of the kinetic Theory of Gases?
SchoolNGR Classroom
  • A The molecules move at random
  • B The size of molecules is negligble as compared with the volume of gas
  • C The molecular collisions are perfectly elastic
  • D Every molecule has the same kinetic energy at a particular temperature
  • E The average kinetic energy is proportional to the absolute temperature of the gas
View Answer & Explanation
Question 238:
JAMB 1981
The electronic configuration of elements X and Y are X = 2, 8, 6; Y = 2, 8, 7. The bond in the compound formed by X and Y is expected to be?
SchoolNGR Classroom
  • A Ionic
  • B Covalent
  • C Dative covalent
  • D Metallic
  • E None of the above
View Answer & Explanation
Question 239:
JAMB 1981
5cm<sup style='font-size: smaller;'>3</sup> of a saturated solution of sodium chloride at 30°C gave, on careful evaporation, 1.95g of solid salt. The solubility of sodium chloride at 30°C?<br/>(Na = 23, Cl = 35.5)
SchoolNGR Classroom
  • A 5.00 mole dm<sup style='font-size: smaller;'>3</sup>
  • B 5.67 mole dm<sup style='font-size: smaller;'>3</sup>
  • C 6.00 mole dm<sup style='font-size: smaller;'>3</sup>
  • D 6.67 mole dm<sup style='font-size: smaller;'>3</sup>
  • E 7.00 mole dm<sup style='font-size: smaller;'>3</sup>
View Answer & Explanation
Question 240:
JAMB 1981
In the extraction of iron, which of the following reactions does NOT take place in the blast furnace?
SchoolNGR Classroom
  • A CO<sub style='font-size: smaller;'>2</sub> + C → 2CO
  • B 2Fe<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>3</sub> + 3C → 4Fe + 3CO<sub style='font-size: smaller;'>2</sub>
  • C Fe<sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>3</sub> + 3C → 2Fe + 3CO<sub style='font-size: smaller;'>2</sub>
  • D CaCO<sub style='font-size: smaller;'>3</sub> → CaO + CO<sub style='font-size: smaller;'>2</sub>
  • E CaO + SiO<sub style='font-size: smaller;'>2</sub> → CaSiO<sub style='font-size: smaller;'>3</sub>
View Answer & Explanation

Stay Updated

Follow us on:


Subjects