ISC Chemistry 2023 Specimen Paper with Answers
All 27 questions of the ISC Chemistry 2023 Specimen 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: [two, Williamson’s synthesis, three… 4 marks · Fill in
- Q1(B) Select and write the correct alternative from the choices given below: An alkyl isocyanide on complete reduction gives: For a… 4 marks · Short answer
- Q1(C) Match the following: 4 marks · Match
- Q1(D) Question 2 marks · Short answer
- Q2 The osmotic pressure of $20\text{ g}$ haemoglobin in $500\text{ ml}$ of solution is $0\cdot016\text{ atm}$ at $25^\circ\text{C}$… 2 marks · Numerical
- Q3 Give reason for the following: Transition metals form large number of complex compounds. Transition elements show variable… 2 marks · Short answer
- Q4 Identify compounds [A] and [B] in the following reactions… 2 marks · Short answer
- Q5 State reasons for the following: Ethylamine is soluble in water whereas aniline is not soluble in water. Aliphatic amines are… 2 marks · Short answer
- Q6 Calculate the standard free energy change ($\Delta G^\circ$) for the following chemical reaction… 2 marks · Numerical
- Q7 Complete and balance the following chemical equations: $\text{KMnO}_4 + \text{H}_2\text{SO}_4 + \text{FeSO}_4 \longrightarrow$… 2 marks · Fill in
- Q8(i) How will the following be obtained? (Give chemical equation) Picric acid from phenol Ethanol from formaldehyde 2 marks · Short answer
- Q8(ii) Write the chemical equations for the dehydration of ethanol with conc. $\text{H}_2\text{SO}_4$ at $140^\circ\text{C}$ and… 2 marks · Short answer
- Q9 A solution of urea in water has boiling point $100\cdot128^\circ\text{C}$. Calculate the freezing point of the same solution… 2 marks · Numerical
- Q10 Give one chemical test for each to distinguish between the following pair of compounds. Formaldehyde and acetic acid Acetaldehyde… 2 marks · Short answer
- Q11 Why are $\text{Zn}$, $\text{Cd}$ and $\text{Hg}$ not regarded as transition elements? 2 marks · Short answer
- Q12 The rate constant for a first order reaction becomes six times when the temperature is increased from $350\text{ K}$ to… 3 marks · Numerical
- Q13 An organic compound ‘A’ on treatment with aq. $\text{KCN}$ produces compound ‘B’. Compound ‘B’ on reduction with… 3 marks · Short answer
- Q14 Name the four bases present in DNA. Which one of these is not present in RNA? Deficiency of which vitamin causes the following… 3 marks · Short answer
- Q15 An aqueous solution containing $12\cdot48\text{ g}$ of barium chloride in $1000\text{ g}$ of water boils at… 3 marks · Numerical
- Q16 Write the chemical equation for the following named organic reactions. Haloform reaction Reimer - Tiemann reaction Kolbe -… 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 equations) Benzenediazonium chloride to Benzene Ethylamine to ethyl alcohol… 3 marks · Short answer
- Q18 Suppose 50 bacteria are placed in a flask containing nutrients, so that they can multiply. A study at $35^\circ\text{C}$ gave the… 3 marks · Short answer
- Q19 Starting with methyl magnesium bromide, how will the following compounds be synthesised? (a) Acetaldehyde (b) Acetone (c) Acetic… 5 marks · Short answer
- Q20 Name the type of isomerism shown by the following pairs of coordination compounds: (a)… 5 marks · Short answer
- Q21(i) A $0\cdot06\text{ molar}$ $\text{CH}_3\text{COOH}$ solution offers a resistance of $55\text{ ohms}$ to a conductivity cell at… 5 marks · Numerical
- Q21(ii) Write the Nernst equation for the cell reaction given below and calculate the emf of the cell at $298\text{ K}$… 5 marks · Numerical