ISC Chemistry 2023 Question Paper with Answers
All 27 questions of the ISC Chemistry 2023 Question Paper, in printed order. Open a question to read it in full and see its answer.
- Q1(A) Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: [stable, low, aldehyde, unstable, 6, 4… 4 marks · Fill in
- Q1(B) Select and write the correct alternative from the choices given below: (i) The reaction of a primary amine with chloroform and… 4 marks · Short answer
- Q1(C) Match the following: 4 marks · Match
- Q1(D) (i) Assertion: If a solution contains both $\text{H}^+$ and $\text{Na}^+$ ions, the $\text{H}^+$ ions are reduced first at… 2 marks · Short answer
- Q2 Calculate the mass of ascorbic acid (molecular mass $= 176\text{ g/mol}$) that should be dissolved in $155\text{ g}$ of acetic… 2 marks · Numerical
- Q3 Give a reason for each of the following: $\text{Cu}^{2+}$ salts are paramagnetic, while $\text{Cu}^+$ salts are diamagnetic… 2 marks · Short answer
- Q4 Give chemical equations for each of the following: Ethyl chloride is treated with aqueous $\text{KOH}$ solution. Chlorobenzene is… 2 marks · Short answer
- Q5 State one reason for each of the following: Alkylamine is soluble in water whereas arylamine is insoluble in water. Methylamine… 2 marks · Short answer
- Q6 Calculate the emf of the following cell at $298\text{ K}$… 2 marks · Numerical
- Q7 Complete and balance the following chemical equations: $\text{KMnO}_4 + \text{H}_2\text{SO}_4 + \text{KI} \rightarrow$ ____ +… 2 marks · Fill in
- Q8(i) How will the following be obtained? (Give chemical equation) Ethanol from Grignard’s reagent. Diethyl ether from sodium ethoxide. 2 marks · Short answer
- Q8(ii) An organic compound [A] $\text{C}_2\text{H}_6\text{O}$, on heating with conc. $\text{H}_2\text{SO}_4$ at $413\text{ K}$ gives a… 2 marks · Short answer
- Q9 The osmotic pressure of blood at $37^\circ\text{C}$ is $8\cdot21\text{ atm}$. How much glucose in grams should be used per litre… 2 marks · Numerical
- Q10 An aromatic carboxylic acid [A] which readily sublimes on heating, produces compound [B] on treatment with $\text{PCl}_5$… 2 marks · Short answer
- Q11 State a reason for each of the following: $\text{La(OH)}_3$ is more basic than $\text{Lu(OH)}_3$. Transition elements and their… 2 marks · Short answer
- Q12 $20\%$ of a first order reaction is completed in five minutes. How much time will the $60\%$ reaction take to complete? Calculate… 3 marks · Numerical
- Q13 Write the balanced chemical equations for the following name reactions: Sandmeyer’s reaction Wurtz reaction Finkelstein reaction 3 marks · Short answer
- Q14 Give an example each of reducing sugar and non-reducing sugar. What is denaturation of proteins? Give an example each of water… 3 marks · Short answer
- Q15 When $2\text{ g}$ of benzoic acid is dissolved in $25\text{ g}$ of benzene, it shows a depression in freezing point equal to… 3 marks · Numerical
- Q16 Account for the following: Phenol is a stronger acid than aliphatic alcohols. Ethanol gives iodoform reaction whereas methanol… 3 marks · Short answer
- Q17(i) Identify the compounds [A], [B] and [C] in the following reactions… 3 marks · Short answer
- Q17(ii) How will the following be converted? (Give chemical equation) Ethyl bromide to ethyl isocyanide Aniline to benzene diazonium… 3 marks · Short answer
- Q18 A first order reaction is $50\%$ completed in $40\text{ minutes}$ at $300\text{ K}$ and in $20\text{ minutes}$ at $320\text{ K}$… 3 marks · Numerical
- Q19 Write the chemical equations to illustrate the following name reactions: (a) Cannizzaro’s reaction (b) HVZ reaction (c) Aldol… 5 marks · Short answer
- Q20 Name the type of isomerism exhibited by the following pairs of compounds: (a) $[\text{Co}(\text{NH}_3)_5(\text{ONO})]\text{Cl}_2$… 5 marks · Short answer
- Q21(i) The specific conductance of $2\cdot5 \times 10^{-4}\text{ M}$ formic acid is… 5 marks · Numerical
- Q21(ii) The resistance of a conductivity cell with $0\cdot1\text{ M}$ $\text{KCl}$ solution is $200\text{ ohm}$. When the same cell is… 5 marks · Numerical