QUESTION PAPER
2023 BOARD EXAM
CBSE CLASS 12-PCM CHEMISTRY Board Paper 2023 — Set 1
2023
CHEMISTRY
CLASS 12-PCM
CBSE EXAMINATION PAPER-2023
CHEMISTRY
(Solved)
General Instructions :
Read the following instructions carefully and follow them :
- This question paper contains 11 questions. All questions are compulsory.
- This question paper is divided into 3 sections.
- Section A – questions number 1 to 2 are case based questions
- Section B – questions number 3 to 10 are multiple choice questions
- Section C – questions number 11 to 11 are very short answer
- There is no overall choice given in the question paper. However, an internal choice has been provided in few questions.
- Use of calculator is NOT allowed.
Section A
The rate of reaction is concerned with decrease in concentration of reactants or increase in the concentration of products per unit time. It can be expressed as instantaneous rate at a particular instant of time and average rate over a large interval of time. Mathematical representation of rate of reaction is given by rate law. Rate constant and order of a reaction can be determined from rate law or its integrated rate equation.
Section B
The colligative property used for the determination of molar mass of polymers and proteins is :
Low concentration of oxygen in the blood and tissues of people living at high altitude is due to :
The correct cell to represent the following reaction is : Zn + 2Ag⁺ → Zn²⁺ + 2Ag
The most common and stable oxidation state of a Lanthanoid is :
The compounds [Co(SO₄)(NH₃)₅]Br and [Co(Br)(NH₃)₅]SO₄ represent :
The synthesis of alkyl fluoride is best obtained from :
An α- helix is a structural feature of :
Assertion (A) : Low spin tetrahedral complexes are rarely observed.
Reason (R) : Crystal field splitting energy is less than pairing energy for tetrahedral complexes.
Section C
What is Henry's law? Give one application of it.
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