ISC Chemistry 2024 Specimen Paper with Answers
All 35 questions of the ISC Chemistry 2024 Specimen Paper, in printed order. Open a question to read it in full and see its answer.
- Q1(A)(i) Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: [decreases, $\text{CN}^-$ ion… 1 mark · Fill in
- Q1(A)(ii) Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: [decreases, $\text{CN}^-$ ion… 1 mark · Fill in
- Q1(A)(iii) Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: [decreases, $\text{CN}^-$ ion… 1 mark · Fill in
- Q1(A)(iv) Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: [decreases, $\text{CN}^-$ ion… 1 mark · Fill in
- Q1(B)(i) A potassium iodide ($\text{KI}$) solution containing starch turns blue on the addition of chlorine. Which one of the following… 1 mark · MCQ
- Q1(B)(ii) Crystal field splitting energy (CFSE) for high spin $d^4$ octahedral complex is: 1 mark · MCQ
- Q1(B)(iii) Acidified $\text{K}_2\text{Cr}_2\text{O}_7$ solution turns green when $\text{Na}_2\text{SO}_3$ is added to it. This is due to… 1 mark · MCQ
- Q1(B)(iv) Which of the following product is formed when benzene diazonium chloride is reduced by hypophosphorous acid… 1 mark · MCQ
- Q1(B)(v) Which of the following aqueous solution has lowest vapour pressure? 1 mark · MCQ
- Q1(B)(vi) Adding water to two beakers ‘A’ and ‘B’ containing $\text{NaOH}$ and $\text{CH}_3\text{COOH}$ solutions respectively will… 1 mark · Assertion-reason
- Q1(B)(vii) Aniline is soluble in $\text{HCl}$ while it is only slightly soluble in water. 1 mark · Assertion-reason
- Q1(C) During the winter season in a particular year, Kashmir experienced heavy snowfall. It was an unexpected snowfall. Thousands of… 3 marks · Case based
- Q2 Arrange the following alcohols in order of decreasing activity towards Lucas’ reagent. 2-butanol, 2-methyl-2-propanol and… 2 marks · Short answer
- Q3 Give a reason for each of the following: The size of the trivalent cations in Lanthanoid series decreases steadily as the atomic… 2 marks · Short answer
- Q4 Give balanced chemical equations to convert the following: Benzene to biphenyl Propene to propane-1-ol 2 marks · Short answer
- Q5 Account for the following: Salts of cuprous ($\text{Cu}^+$) ion are colourless whereas the salts of cupric ($\text{Cu}^{2+}$) ion… 2 marks · Short answer
- Q6 Two compounds, D-2-chlorobutane and L-2-chlorobutane, are enantiomers of each other. Name one physical property that is: same for… 2 marks · Short answer
- Q7 A rusted piece of iron undergoes electrochemical reactions. Write the chemical reaction taking place at: (a) the electrode that… 2 marks · Short answer
- Q8(i) What happens when (write chemical reactions only) Diethyl ether is treated with phosphorous pentachloride. Ethyl alcohol is… 2 marks · Short answer
- Q8(ii) An organic compound [A] having molecular formula $\text{C}_6\text{H}_6\text{O}$ gives a characteristic colour with aqueous… 2 marks · Short answer
- Q9 John was making noodles in boiling water. When he added common salt ($\text{NaCl}$) to boiling water, the water stopped boiling… 2 marks · Numerical
- Q10 Aromatic aldehydes do not give a reddish-brown precipitate on heating with Fehling solution. Give a reason. Why is benzaldehyde… 2 marks · Short answer
- Q11 Give a reason to explain why transition metals can act as a good catalyst. Scandium ($Z = 21$) does not exhibit variable… 2 marks · Short answer
- Q12 The data in the table given below was obtained in a series of experiments on the rate of the reaction between compounds [A] and… 3 marks · Short answer
- Q13 Arrange the following compounds: $\text{C}_6\text{H}_5\text{NH}_2$, $(\text{C}_2\text{H}_5)_2\text{NH}$… 3 marks · Short answer
- Q14 What products are obtained when sucrose is subjected to acid hydrolysis? Why are Vitamin B and Vitamin C essential for us? On… 3 marks · Short answer
- Q15 Water vapour and liquid water are in equilibrium in a container. At room temperature, the vapour pressure of water is… 3 marks · Short answer
- Q16 Identify the compounds [A], [B] and [C]… 3 marks · Short answer
- Q17(i) How will the following be obtained? (Give chemical equation) Picric acid from Phenol Ethyl acetate from ethanol Anisole from… 3 marks · Short answer
- Q17(ii) Explain the mechanism of acid catalysed dehydration of ethanol to yield the corresponding alkene. 3 marks · Short answer
- Q18 The half-life period ($t_{1/2}$) for decay of radioactive $^{14}\text{C}$ is $5730\text{ years}$. An ancient piece of wood has… 3 marks · Numerical
- Q19 Give a reason for each of the following: (a) Formaldehyde does not undergo aldol condensation, but acetaldehyde does. (b)… 5 marks · Short answer
- Q20 When one mole of an isomer of the complex $[\text{Cr}(\text{H}_2\text{O})_6]\text{Cl}_3$ is treated with $\text{AgNO}_3$, it… 5 marks · Short answer
- Q21(i) Calculate the value of $E^\circ_{\text{cell}}$ and $\Delta G^\circ$ that can be obtained from the following cell under the… 5 marks · Numerical
- Q21(ii) The molar conductivity vs $\sqrt{C}$ curve for $\text{Na}_2\text{SO}_4$, $\text{H}_2\text{SO}_4$, and $\text{NH}_4\text{OH}$ are… 5 marks · Short answer