Chemistry Exam Questions - Grade 12 ESSLCE 2023

Chemistry - Grade 12 -2023 G.C

Grade 12 students can now access their exam results by visiting the Educational Assessment and Examination Services (EAES) website.

50. Which statement describes valence shell electron pair repulsion (VSEPR) theory?

A covalent bond is formed when orbitals of two atoms overlap and the overlap region is occupied by a pair of electrons.
Atomic orbitals are capable of combining to produce new electron distribution.
Electron pairs will be as far apart from each other in three dimensional spaces as possible.
Each degenerate orbitals are occupied by a single electron before the second electrons of opposite spin enters the orbitals.

51. Which of the following compounds reacts with basic oxide to form salt and water?

Neutral oxide
Base
Acidic oxide
Acid

52. Which one of the following reaction represents formation of an acid from its salt?

AgNO3(aq)+NaCl(aq) → ${NaNO}_{3} (aq) + AgCl (s)$ " > ${AgNO}_{3} (aq) + NaCl (aq)$ → ${NaNO}_{3} (aq) + AgCl (s)$
NaNO3(s)+H2SO4(l) → ${NaHSO}_{4} (s) + {HNO}_{3} (l)$ " > ${NaNO}_{3} (s) + H_{2} {SO}_{4} (l)$ → ${NaHSO}_{4} (s) + {HNO}_{3} (l)$
P2O5(s)+6NaOH(aq) → $2 {Na}_{3} {PO}_{4} (s) + 3 H_{2} O_{} (l)$ " > $P_{2} O_{5} (s) + 6 NaOH (aq)$ → $2 {Na}_{3} {PO}_{4} (s) + 3 H_{2} O_{} (l)$
CH3COOH(aq)+CH3OH(aq) → ${CH}_{3} {CO}_{2} {CH}_{3} (aq) + H_{2} O_{} (l)$ " > ${CH}_{3} COOH (aq) + {CH}_{3} OH (aq)$ → ${CH}_{3} {CO}_{2} {CH}_{3} (aq) + H_{2} O_{} (l)$

53. The negative logarithm of the molar concentration of hydrogen ion to the base ten is known as _______________.

54. Which one of the following galvanic cell is an example of secondary cell?

Zinc-carbon dry cell
Leclanche dry cell
Lead storage cell
Daniel's cell

We have provided these questions from previous years grade 12 Ethiopian Secondary School Leaving Certificate Examination (ESSLCE) exams with the sole purpose of assisting students in their studies and preparations for upcoming exams. Please be aware that these questions are not indicative of future exam content. Good luck with your studies!