ISC Chemistry Paper 2023 Answer Key: This is the time when all the Science stream ISC students are feeling stressed about the upcoming Chemistry exam. Don't worry, help is here! The ISC exams are happening now, and we know you're looking for all the resources you can find to ace your exams.
Remember, the ISC Chemistry exam is on Monday, February 26th at 2 PM. To feel more prepared, you can check out the previous year's (2023) ISC Chemistry paper and its solutions in PDF format right here! There's a good chance you might see similar questions this year. Just scroll down and download it!
ISC Class 12 Chemistry Revised Course Structure
Check the table below and follow this to prepare for the CISCE Class 12 Chemistry exam 2024.
| S. No. | Unit | Total Weightage |
| 1 | Solutions | Physical Chemistry (25 Marks) |
| 2 | Electrochemistry | |
| 3 | Chemical Kinetics | |
| 4 | d -and f -Block Elements | Inorganic Chemistry (25 Marks) |
| 5 | Coordination Compounds | |
| 6 | Haloalkanes and Haloarenes | Organic Chemistry (31 Marks) |
| 7 | Alcohols, Phenols and Ethers | |
| 8 | Aldehydes, Ketones and Carboxylic Acids | |
| 9 | Organic Compounds containing Nitrogen | |
| 10 | Biomolecules | |
| Total | 70 Marks | |
ISC Chemistry Paper 2023 Solved
SECTION A — 14 MARKS
(A) Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: [4 × 1]
[stable, low, aldehyde, unstable, 6, 4, ethane, Clemmensen’s, 2, 3, carboxylic acid, high, propane, Rosenmund’s]
(i) The primary alcohols are easily oxidised first into aldehyde and then into carboxylic acid.
(ii) The intermediate activated complex in a chemical reaction is highly unstable and then into high.
(iii) The coordination number and oxidation state of the complex K4[Fe(CN)6]are 6 and 2 respectively.
(iv) Propanone on reaction with zinc-amalgam in presence of conc. HCl gives Propane and the reaction is known as Clemmensen’s reduction.
Answers:
(i) Aldehyde, carboxylic acid
(ii) Unstable, high
(iii) 6,2
(iv) Propane, Clemmensen’s
(B) Select and write the correct alternative from the choices given below: [4 × 1]
(i) The reaction of a primary amine with chloroform and ethanolic KOH is called:
(a) Carbylamine reaction
(b) Kolbe’s reaction
(c) Reimer-Tiemann reaction
(d) Wurtz-Fittig reaction
(ii) Which one of the following statements is TRUE for the Galvanic cell?
(a) Electrons flow from copper electrode to zinc electrode.
(b) Current flows from zinc electrode to copper electrode.
(c) Cations move towards copper electrode.
(d) Cations move towards zinc electrode.
(iii) Which one of the following compounds is diamagnetic and colourless?
(a) K2Cr2O7
(b) ZnSO4
(c) KMnO4
(d) Cr2(SO4)3
(iv) For a first order reaction, the half-life period (t½) is:
(a) proportional to the initial concentration.
(b) inversely proportional to the initial concentration.
(c) proportional to the square root of the initial concentration.
(d) independent of the initial concentration.
Answers:
(i) Option (a) is
(ii) Option(d) is
(iii) Option(b) is
(iv) Option(d) is
(C) Match the following: [4 × 1]
(i) Phenol (a) Hexane + heptane
(ii) EDTA (b) Globular protein
(iii) Ideal solution (c) Azo dye
(iv) Insulin (d) Hexadentate ligand
Answer:
| i | c |
| ii | d |
| iii | a |
| iv | b |
(D) (i) Assertion: If a solution contains both H+ and Na– ions, the H+ ions are reduced first at cathode.
Reason: Cations with higher E° value are reduced first at cathode.
(a) Both Assertion and Reason are true, and Reason is the correct explanation for Assertion.
(b) Both Assertion and Reason are true, but Reason is not the correct explanation for Assertion.
(c) Assertion is true but Reason is false.
(d) Assertion is false but Reason is true.
(ii) Assertion: Addition of bromine water to 1-butene gives two optical isomers.
Reason: The product formed contains two asymmetric carbon atoms.
(a) Both Assertion and Reason are true, and Reason is the correct explanation for Assertion.
(b) Both Assertion and Reason are true, but Reason is not the correct explanation for Assertion.
(c) Assertion is true but Reason is false.
(d) Assertion is false but Reason is true.
Answers:
(i) Option (a) is
(ii) Option (a) is correct.
To get the complete paper with solutions download the PDF from below.
Download ISC Class 12 Chemistry 2023 Solved Question Paper PDF Here |
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