ISC Chemistry 2018 Specimen Paper with Answers
All 28 questions of the ISC Chemistry 2018 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/words from those given in the brackets: (increases, decreases, efficient… 4 marks · Fill in
- Q1(b) Complete the following statements by selecting the correct alternative from the choices given: (i) The molal freezing point… 4 marks · Short answer
- Q1(c) Match the following: 4 marks · Match
- Q1(d) Answer the following questions: (i) Calculate the mass of compound (molar mass = $256\text{ g mol}^{-1}$) to be dissolved in… 8 marks · Short answer
- Q2(a) Identify the reaction order from each of the following rate constants… 2 marks · Short answer
- Q2(b) Write two differences between ‘order of reaction’ and ‘molecularity of reaction’. 2 marks · Short answer
- Q3 Differentiate between an antiseptic and a disinfectant. Name a biodegradable detergent. 2 marks · Short answer
- Q4 What will be the major product obtained when 2-bromobutane reacts with alcoholic potassium hydroxide? State the type of reaction… 2 marks · Short answer
- Q5 Write the names of the monomers of the following polymers: Nylon-6 Buna-N 2 marks · Short answer
- Q6 Explain the amphoteric behaviour of amino acids. 2 marks · Short answer
- Q7(a) How is phenol converted to benzoic acid? Explain with the help of balanced chemical equations. 2 marks · Short answer
- Q7(b) Write the mechanism of acid dehydration of ethanol to yield ethene. 2 marks · Short answer
- Q8 A substance decomposes by following first order kinetics. If $50\%$ of the compound is decomposed in $120\text{ minutes}$, how… 2 marks · Numerical
- Q9(a) Calculate the amount of $\text{CaCl}_2$ (molar mass = $111\text{ g mol}^{-1}$) which must be added to $500\text{ g}$ of water to… 3 marks · Numerical
- Q9(b) A solution containing $0\cdot5\text{ g}$ of $\text{KCl}$ dissolves in $100\text{ g}$ of water and freezes at… 3 marks · Numerical
- Q10 An element with density $10\text{ g cm}^{-3}$ forms a cubic unit cell with edge length of $3 \times 10^{-8}\text{ cm}$. What is… 3 marks · Numerical
- Q11 Give reasons for the following observations: Physisorption decreases with an increase in temperature. Addition of alum purifies… 3 marks · Short answer
- Q12 What type of isomers are $[\text{Co}(\text{NH}_3)_5\text{Br}]\text{SO}_4$ and $[\text{Co}(\text{NH}_3)_5\text{SO}_4]\text{Br}$?… 3 marks · Short answer
- Q13(a) Account for the following/Explain why: Transition metals exhibit variable oxidation states. $\text{Zr}$ ($Z = 40$) and… 3 marks · Short answer
- Q13(b) Complete the following chemical equations: $\text{K}_2\text{Cr}_2\text{O}_7 + \text{H}_2\text{SO}_4 + \text{FeSO}_4 \rightarrow$… 3 marks · Fill in
- Q14 Arrange the following as directed: Increasing order of basic strength: Aniline, p – nitroaniline and p – toluidine. Decreasing… 3 marks · Short answer
- Q15 How is silver extracted from its ore? Explain the process with relevant equations. 3 marks · Short answer
- Q16(a) Resistance of a conductivity cell filled with $0\cdot1\text{ mol L}^{-1}\text{ KCl}$ solution is $100\ \Omega$. If the resistance… 5 marks · Short answer
- Q16(b) Calculate emf of the following cell at $298\text{ K}$… 5 marks · Short answer
- Q17(a) Account for the following/Explain why: (1) Interhalogens are more reactive than halogens. (2) $\text{N}_2$ is less reactive at… 5 marks · Short answer
- Q17(b) Account for the following/Explain why: (1) $\text{PCl}_5$ exists but $\text{NCl}_5$ does not. (2) Fluorine is a stronger… 5 marks · Short answer
- Q18(a) Write the product(s) of the following reactions: (1) $\text{CH}_3\text{COCH}_3 + \text{H}_2\text{NOH} \rightarrow$ (2)… 5 marks · Short answer
- Q18(b) Write the chemical equations to illustrate the following name reactions: (1) Wolff-Kishner reduction. (2) Aldol condensation. (3)… 5 marks · Short answer