QUESTION PAPER
2022 BOARD EXAM
CBSE CLASS 12-PCB CHEMISTRY Board Paper 2022 — Set 4
2022
CHEMISTRY
CLASS 12-PCB
CBSE EXAMINATION PAPER-2022
CHEMISTRY
(Solved)
General Instructions :
Read the following instructions carefully and follow them :
- This question paper contains 5 questions. All questions are compulsory.
- This question paper is divided into 3 sections.
- Section A – questions number 1 to 1 are case based questions
- Section B – questions number 2 to 2 are short answer
- Section C – questions number 3 to 5 are long 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
Section B
In a plot of ∧m against the square root of concentration (C1/2) for strong and weak electrolyte, the value of limiting molar conductivity of a weak electrolyte cannot be obtained graphically. Suggest a way to obtain this value. Also state the related law, if any.
Section C
A compound 'A' (C2H4O) on oxidation gives 'B' (C2H4O2). 'A' undergoes Iodoform reaction to give yellow precipitate and reacts with HCN to form the compound 'C'. 'C' on hydrolysis gives 2-hydroxypropanoic acid. Identify the compounds 'A', 'B' and 'C'. Write down equations for the reactions involved.
Observe the given figure and answer the following questions :(i) (a) Write the expression for adsorption of gases on solids in the form of an equation. (ii)What is the slope of the graph ? (iii)What does the intercept of the line represent ?
Answer the following questions on the basis of the figure given below :(i) Which element in 3d series has lowest enthalpy of atomisation ?(ii) Why do metals of the second and third series have greater enthalpies of atomisation ? (iii) Why are enthalpies of atomisation of transition metals quite high ?
Other Years — CHEMISTRY