ISC Chemistry 2020 Question Paper with Answers
All 28 questions of the ISC Chemistry 2020 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/words from those given in the brackets: (iodoform, volume, mass, haloform… 4 marks · Fill in
- Q1(b) Select the correct alternative from the choices given: (i) The packing efficiency of simple cubic structure, body centered cubic… 4 marks · Short answer
- Q1(c) Match the following: 4 marks · Match
- Q1(d) Answer the following questions: (i) What is the common name of the polymer obtained by the polymerization of caprolactam? Is it… 8 marks · Short answer
- Q2(a) An element has atomic weight $93\text{ g mol}^{-1}$ and density $11\cdot5\text{ g cm}^{-3}$. If the edge length of its unit cell… 2 marks · Short answer
- Q2(b) Calculate the radius of copper atom. The atomic weight of copper is $63\cdot55\text{ g mol}^{-1}$. It crystallises in face… 2 marks · Numerical
- Q3 Complete and balance the following chemical equations… 2 marks · Fill in
- Q4 Write the chemical equation for the reaction of glucose with bromine water. Write the zwitter ion structure of glycine. 2 marks · Short answer
- Q5 How do antiseptics differ from disinfectants? Name a substance that can be used as an antiseptic as well as a disinfectant. 2 marks · Short answer
- Q6 An alloy of gold ($\text{Au}$) and cadmium ($\text{Cd}$) crystallises with a cubic structure in which gold atoms occupy the… 2 marks · Short answer
- Q7(a) State reasons for the following: Ethylamine is soluble in water whereas aniline is insoluble in water. Aliphatic amines are… 2 marks · Short answer
- Q7(b) Complete and balance the following equations… 2 marks · Fill in
- Q8 Draw the structure of xenon tetrafluoride molecule. State the hybridisation of the central atom and the geometry of the molecule. 2 marks · Drawing
- Q9(a) Calculate the emf and $\Delta G$ for the given cell at $25^\circ\text{C}$… 3 marks · Numerical
- Q9(b) Calculate the degree of dissociation ($\alpha$) of acetic acid, if its molar conductivity ($\Lambda_m$) is… 3 marks · Numerical
- Q10 Name an important ore of silver. How is silver extracted from its sulphide ore? Give balanced chemical equations involved in the… 3 marks · Short answer
- Q11 How will you convert the following: Chlorobenzene to biphenyl. Propene to 1-bromopropane. Chlorobenzene to aniline. 3 marks · Short answer
- Q12 Explain what is observed when: A beam of light is passed through a colloidal solution. An electric current is passed through a… 3 marks · Short answer
- Q13(a) How will you convert the following: (Give balanced equation) Benzoyl chloride to benzaldehyde. Methyl chloride to acetic acid… 3 marks · Short answer
- Q13(b) A ketone A ($\text{C}_4\text{H}_8\text{O}$) which undergoes Iodoform reaction gives compound B on reduction. B on heating with… 3 marks · Short answer
- Q14 A first order reaction is $50\%$ completed in $30\text{ minutes}$ at $300\text{ K}$ and in $10\text{ minutes}$ at $320\text{ K}$… 3 marks · Numerical
- Q15 Explain the following: Transition metals and their compounds generally exhibit a paramagnetic behaviour. There is an increase in… 3 marks · Short answer
- Q16(a) The elevation in boiling point when $0\cdot30\text{ g}$ of acetic acid is dissolved in $100\text{ g}$ of benzene is… 5 marks · Short answer
- Q16(b) An aqueous solution of a non-volatile solute freezes at $272\cdot4\text{ K}$, while pure water freezes at $273\cdot0\text{ K}$… 5 marks · Short answer
- Q17(a) Write the IUPAC names of the following complexes: (1) $[\text{Cu}(\text{NH}_3)_4]\text{SO}_4$ (2)… 5 marks · Short answer
- Q17(b) Name of the type of isomerism exhibited by the following pairs of compounds: (1) $[\text{Co}(\text{ONO})(\text{NH}_3)_5]^{2+}$… 5 marks · Short answer
- Q18(a) Give balanced chemical equations for the following reactions: (1) Phenol is treated with ice cold alkaline solution of benzene… 5 marks · Short answer
- Q18(b) Write chemical equations to illustrate the following name reactions: (1) Williamson’s synthesis. (2) Esterification reaction (3)… 5 marks · Short answer