ISC Chemistry 2019 Question Paper with Answers
All 28 questions of the ISC Chemistry 2019 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: (more than, primary, cathode, Lucas… 4 marks · Fill in
- Q1(b) Select the correct alternative from the choices given: (i) The cell reaction is spontaneous or feasible when emf of the cell is… 4 marks · Short answer
- Q1(c) Match the following: 4 marks · Match
- Q1(d) Answer the following questions: (i) (1) Which trivalent ion has maximum size in the Lanthanoid series i.e. Lanthanum ion… 8 marks · Short answer
- Q2(a) For the reaction $\text{A} + \text{B} \rightarrow \text{C} + \text{D}$, the initial rate for different reactions and initial… 2 marks · Short answer
- Q2(b) $25\%$ of a first order reaction is completed in $30\text{ minutes}$. Calculate the time taken in minutes for the reaction to go… 2 marks · Numerical
- Q3 Name the type of drug which lowers the body temperature in high fever condition. What are tranquilizers? Give one example of a… 2 marks · Short answer
- Q4 Write the balanced chemical equation for each of the following: Chlorobenzene treated with ammonia in the presence of… 2 marks · Short answer
- Q5 Name the monomer and the type of polymerisation that takes place when PTFE is formed. Name the monomers of nylon 6, 6. 2 marks · Short answer
- Q6 Name two water soluble vitamins and the diseases caused by their deficiency in the diet of an individual. 2 marks · Short answer
- Q7(a) How will you obtain the following (give balanced chemical equations): Benzene from phenol. Iodoform from ethanol. 2 marks · Short answer
- Q7(b) How will you obtain the following (give balanced chemical equations): Salicylaldehyde from phenol. Propan–2–ol from Grignard’s… 2 marks · Short answer
- Q8 Show that for a first order reaction the time required to complete $75\%$ of reaction is about $2$ times more than that required… 2 marks · Derivation
- Q9(a) When $0\cdot4\text{ g}$ of oxalic acetic acid is dissolved in $40\text{ g}$ of benzene, the freezing point of the solution is… 3 marks · Numerical
- Q9(b) A solution is prepared by dissolving $9\cdot25\text{ g}$ of non-volatile solute in $450\text{ ml}$ of water. It has an osmotic… 3 marks · Numerical
- Q10 An element occurs in body centered cubic structure. Its density is $8\cdot0\text{ g/cm}^3$. If the cell edge is $250\text{ pm}$… 3 marks · Numerical
- Q11 Describe the role of the following: Cryolite in the extraction of aluminium from pure alumina. NaCN in the extraction of silver… 3 marks · Short answer
- Q12 Write the IUPAC names of the following: (1) $\text{K}_3[\text{Fe}(\text{C}_2\text{O}_4)_3]$ (2)… 3 marks · Short answer
- Q13(a) Explain why: Transition elements form alloys. $\text{Zn}^{2+}$ salts are white whereas $\text{Cu}^{2+}$ salts are coloured… 3 marks · Short answer
- Q13(b) Complete and balance the following chemical equations… 3 marks · Fill in
- Q14 Give balanced equations for the following: Aniline is treated with bromine water. Ethylamine is heated with chloroform and… 3 marks · Short answer
- Q15 Define the following terms with suitable examples: Peptisation Electrophoresis Dialysis 3 marks · Short answer
- Q16(a) Calculate the mass of silver deposited at cathode when a current of $2\text{ amperes}$ is passed through a solution of… 5 marks · Short answer
- Q16(b) Define the following terms: (1) Specific conductance (2) Kohlrausch’s Law The resistance of a conductivity cell containing… 5 marks · Short answer
- Q17(a) Explain why: (1) Fluorine has lower electron affinity than chlorine. (2) Red phosphorus is less reactive than white phosphorous… 5 marks · Short answer
- Q17(b) Explain why: (1) Interhalogen compounds are more reactive than the related elemental halogens. (2) Sulphur exhibits tendency for… 5 marks · Short answer
- Q18(a) Give balanced chemical equations for the following reactions: (1) Acetaldehyde reacts with hydrogen cyanide. (2) Acetone reacts… 5 marks · Short answer
- Q18(b) Write chemical equations to illustrate the following name reactions: (1) Aldol condensation. (2) Cannizzaro’s reaction. (3)… 5 marks · Short answer