CHSE Odisha Elective Chemistry case studies
CHSE Odisha Elective Chemistry · Put your knowledge to work in context.
The CHSE Odisha Higher Secondary Elective Chemistry is the Class XII chemistry subject taken by +2 Science students under the Council of Higher Secondary Education, Odisha. It is a two-part credential: a written theory paper and a practical examination carrying an internal-assessment component, and it is the chemistry qualification that state colleges and universities, as well as national entrance examinations, expect from an Odisha +2 Science candidate. The CHSE Odisha Elective Chemistry case studies are 5 cases and about 2,802 words.
1Why the Daniell Cell Reads Low
In a school laboratory, a student assembles a Daniell cell at 298 K: Zn(s) ZnSO4(aq, 0.010 M) CuSO4(aq, 0.10 M) Cu(s). The standard electrode potentials are E°(Zn²⁺/Zn) = −0.76 V and E°(Cu²⁺/Cu) = +0.34 V.
584 words, about 3 min2Clock Reaction with a Concentration Mismatch
In a kinetic study of the reaction between A and B, a student measures initial rates at 298 K by changing one concentration at a time. The data are: Experiment 1, [A]0 = 0.020 M, [B]0 = 0.020 M, initial rate = 4.0 × 10⁻⁴ M s⁻¹; Experiment 2, [A]0 = 0.040 M, [B]0 = 0.020 M, rate = 8.0 × 10⁻⁴ M s⁻¹; Experiment 3, [A]0 = 0.020 M, [B]0 = 0.040 M, rate = 1.6 × 10⁻³ M s⁻¹.
583 words, about 3 min3Which Cobalt Complex Is Which?
A student prepares two cobalt(III) ammine complexes. Sample X is made from CoCl3·5NH3 and sample Y from CoCl3·4NH3.
501 words, about 3 min4Four Bottles from the Chemistry Storeroom
A laboratory receives a 500 mL bottle labelled ethanol from a local supplier. The liquid is miscible with water in all proportions, gives brisk effervescence with sodium metal, and does not become turbid with Lucas reagent at room temperature even after 10 minutes.
599 words, about 3 min5Identifying an Unknown Carbonyl Compound
Four unlabeled samples W, X, Y and Z were recovered from a reaction mixture known to contain propanal, propanone, ethanoic acid and aniline. The following tests are recorded.
535 words, about 3 min