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Page 1 JAM 2020 CHEMISTRY - CY CY 1/21 Paper Specific Instructions 1. The examination is of 3 hours duration. There are a total of 60 questions carrying 100 marks. The entire paper is divided into three sections, A, B and C. All sections are compulsory. Questions in each section are of different types. 2. Section – A contains a total of 30 Multiple Choice Questions (MCQ). Each MCQ type question has four choices out of which only one choice is the correct answer. Questions Q.1 – Q.30 belong to this section and carry a total of 50 marks. Q.1 – Q.10 carry 1 mark each and Questions Q.11 – Q.30 carry 2 marks each. 3. Section – B contains a total of 10 Multiple Select Questions (MSQ). Each MSQ type question is similar to MCQ but with a difference that there may be one or more than one choice(s) that are correct out of the four given choices. The candidate gets full credit if he/she selects all the correct answers only and no wrong answers. Questions Q.31 – Q.40 belong to this section and carry 2 marks each with a total of 20 marks. 4. Section – C contains a total of 20 Numerical Answer Type (NAT) questions. For these NAT type questions, the answer is a real number which needs to be entered using the virtual keyboard on the monitor. No choices will be shown for this type of questions. Questions Q.41 – Q.60 belong to this section and carry a total of 30 marks. Q.41 – Q.50 carry 1 mark each and Questions Q.51 – Q.60 carry 2 marks each. 5. In all sections, questions not attempted will result in zero mark. In Section – A (MCQ), wrong answer will result in NEGATIVE marks. For all 1 mark questions, 1/3 marks will be deducted for each wrong answer. For all 2 marks questions, 2/3 marks will be deducted for each wrong answer. In Section – B (MSQ), there is NO NEGATIVE and NO PARTIAL marking provisions. There is NO NEGATIVE marking in Section – C (NAT) as well. 6. Only Virtual Scientific Calculator is allowed. Charts, graph sheets, tables, cellular phone or other electronic gadgets are NOT allowed in the examination hall. 7. The Scribble Pad will be provided for rough work. Page 2 JAM 2020 CHEMISTRY - CY CY 1/21 Paper Specific Instructions 1. The examination is of 3 hours duration. There are a total of 60 questions carrying 100 marks. The entire paper is divided into three sections, A, B and C. All sections are compulsory. Questions in each section are of different types. 2. Section – A contains a total of 30 Multiple Choice Questions (MCQ). Each MCQ type question has four choices out of which only one choice is the correct answer. Questions Q.1 – Q.30 belong to this section and carry a total of 50 marks. Q.1 – Q.10 carry 1 mark each and Questions Q.11 – Q.30 carry 2 marks each. 3. Section – B contains a total of 10 Multiple Select Questions (MSQ). Each MSQ type question is similar to MCQ but with a difference that there may be one or more than one choice(s) that are correct out of the four given choices. The candidate gets full credit if he/she selects all the correct answers only and no wrong answers. Questions Q.31 – Q.40 belong to this section and carry 2 marks each with a total of 20 marks. 4. Section – C contains a total of 20 Numerical Answer Type (NAT) questions. For these NAT type questions, the answer is a real number which needs to be entered using the virtual keyboard on the monitor. No choices will be shown for this type of questions. Questions Q.41 – Q.60 belong to this section and carry a total of 30 marks. Q.41 – Q.50 carry 1 mark each and Questions Q.51 – Q.60 carry 2 marks each. 5. In all sections, questions not attempted will result in zero mark. In Section – A (MCQ), wrong answer will result in NEGATIVE marks. For all 1 mark questions, 1/3 marks will be deducted for each wrong answer. For all 2 marks questions, 2/3 marks will be deducted for each wrong answer. In Section – B (MSQ), there is NO NEGATIVE and NO PARTIAL marking provisions. There is NO NEGATIVE marking in Section – C (NAT) as well. 6. Only Virtual Scientific Calculator is allowed. Charts, graph sheets, tables, cellular phone or other electronic gadgets are NOT allowed in the examination hall. 7. The Scribble Pad will be provided for rough work. JAM 2020 CHEMISTRY - CY CY 2/21 SECTION – A MULTIPLE CHOICE QUESTIONS (MCQ) Q. 1 – Q.10 carry one mark each. Q.1 The graph that represents the temperature (T) ? entropy (S) variation of a Carnot cycle is (A) (B) (C) (D) Q.2 For the radical chain reaction below, the correct classification for step 2 and step 3 is, respectively, (A) chain propagating, chain terminating (B) chain branching, chain terminating (C) chain propagating, chain propagating (D) chain propagating, chain branching Page 3 JAM 2020 CHEMISTRY - CY CY 1/21 Paper Specific Instructions 1. The examination is of 3 hours duration. There are a total of 60 questions carrying 100 marks. The entire paper is divided into three sections, A, B and C. All sections are compulsory. Questions in each section are of different types. 2. Section – A contains a total of 30 Multiple Choice Questions (MCQ). Each MCQ type question has four choices out of which only one choice is the correct answer. Questions Q.1 – Q.30 belong to this section and carry a total of 50 marks. Q.1 – Q.10 carry 1 mark each and Questions Q.11 – Q.30 carry 2 marks each. 3. Section – B contains a total of 10 Multiple Select Questions (MSQ). Each MSQ type question is similar to MCQ but with a difference that there may be one or more than one choice(s) that are correct out of the four given choices. The candidate gets full credit if he/she selects all the correct answers only and no wrong answers. Questions Q.31 – Q.40 belong to this section and carry 2 marks each with a total of 20 marks. 4. Section – C contains a total of 20 Numerical Answer Type (NAT) questions. For these NAT type questions, the answer is a real number which needs to be entered using the virtual keyboard on the monitor. No choices will be shown for this type of questions. Questions Q.41 – Q.60 belong to this section and carry a total of 30 marks. Q.41 – Q.50 carry 1 mark each and Questions Q.51 – Q.60 carry 2 marks each. 5. In all sections, questions not attempted will result in zero mark. In Section – A (MCQ), wrong answer will result in NEGATIVE marks. For all 1 mark questions, 1/3 marks will be deducted for each wrong answer. For all 2 marks questions, 2/3 marks will be deducted for each wrong answer. In Section – B (MSQ), there is NO NEGATIVE and NO PARTIAL marking provisions. There is NO NEGATIVE marking in Section – C (NAT) as well. 6. Only Virtual Scientific Calculator is allowed. Charts, graph sheets, tables, cellular phone or other electronic gadgets are NOT allowed in the examination hall. 7. The Scribble Pad will be provided for rough work. JAM 2020 CHEMISTRY - CY CY 2/21 SECTION – A MULTIPLE CHOICE QUESTIONS (MCQ) Q. 1 – Q.10 carry one mark each. Q.1 The graph that represents the temperature (T) ? entropy (S) variation of a Carnot cycle is (A) (B) (C) (D) Q.2 For the radical chain reaction below, the correct classification for step 2 and step 3 is, respectively, (A) chain propagating, chain terminating (B) chain branching, chain terminating (C) chain propagating, chain propagating (D) chain propagating, chain branching JAM 2020 CHEMISTRY - CY CY 3/21 Q.3 The salt bridge in a galvanic cell allows the flow of (A) ions but NOT electrons (B) BOTH ions and electrons (C) electrons but NOT ions (D) NEITHER ions NOR electrons Q.4 The nucleobase NOT found in DNA is (A) Thymine (B) Uracil (C) Guanine (D) Adenine Q.5 The correct statement for the following structures is (A) 1, 2 and 3 are resonance structures (B) 1 and 2 are resonance structures, whereas 3 is an isomer of 1 and 2 (C) 1 and 3 are resonance structures, whereas 2 is an isomer of 1 and 3 (D) 1, 2 and 3 are constitutional isomers Q.6 The correct order of boiling points of compounds I ?IV is (A) II > I > III > IV (B) II > III > I > IV (C) I > III > IV > II (D) I > IV > III > II Page 4 JAM 2020 CHEMISTRY - CY CY 1/21 Paper Specific Instructions 1. The examination is of 3 hours duration. There are a total of 60 questions carrying 100 marks. The entire paper is divided into three sections, A, B and C. All sections are compulsory. Questions in each section are of different types. 2. Section – A contains a total of 30 Multiple Choice Questions (MCQ). Each MCQ type question has four choices out of which only one choice is the correct answer. Questions Q.1 – Q.30 belong to this section and carry a total of 50 marks. Q.1 – Q.10 carry 1 mark each and Questions Q.11 – Q.30 carry 2 marks each. 3. Section – B contains a total of 10 Multiple Select Questions (MSQ). Each MSQ type question is similar to MCQ but with a difference that there may be one or more than one choice(s) that are correct out of the four given choices. The candidate gets full credit if he/she selects all the correct answers only and no wrong answers. Questions Q.31 – Q.40 belong to this section and carry 2 marks each with a total of 20 marks. 4. Section – C contains a total of 20 Numerical Answer Type (NAT) questions. For these NAT type questions, the answer is a real number which needs to be entered using the virtual keyboard on the monitor. No choices will be shown for this type of questions. Questions Q.41 – Q.60 belong to this section and carry a total of 30 marks. Q.41 – Q.50 carry 1 mark each and Questions Q.51 – Q.60 carry 2 marks each. 5. In all sections, questions not attempted will result in zero mark. In Section – A (MCQ), wrong answer will result in NEGATIVE marks. For all 1 mark questions, 1/3 marks will be deducted for each wrong answer. For all 2 marks questions, 2/3 marks will be deducted for each wrong answer. In Section – B (MSQ), there is NO NEGATIVE and NO PARTIAL marking provisions. There is NO NEGATIVE marking in Section – C (NAT) as well. 6. Only Virtual Scientific Calculator is allowed. Charts, graph sheets, tables, cellular phone or other electronic gadgets are NOT allowed in the examination hall. 7. The Scribble Pad will be provided for rough work. JAM 2020 CHEMISTRY - CY CY 2/21 SECTION – A MULTIPLE CHOICE QUESTIONS (MCQ) Q. 1 – Q.10 carry one mark each. Q.1 The graph that represents the temperature (T) ? entropy (S) variation of a Carnot cycle is (A) (B) (C) (D) Q.2 For the radical chain reaction below, the correct classification for step 2 and step 3 is, respectively, (A) chain propagating, chain terminating (B) chain branching, chain terminating (C) chain propagating, chain propagating (D) chain propagating, chain branching JAM 2020 CHEMISTRY - CY CY 3/21 Q.3 The salt bridge in a galvanic cell allows the flow of (A) ions but NOT electrons (B) BOTH ions and electrons (C) electrons but NOT ions (D) NEITHER ions NOR electrons Q.4 The nucleobase NOT found in DNA is (A) Thymine (B) Uracil (C) Guanine (D) Adenine Q.5 The correct statement for the following structures is (A) 1, 2 and 3 are resonance structures (B) 1 and 2 are resonance structures, whereas 3 is an isomer of 1 and 2 (C) 1 and 3 are resonance structures, whereas 2 is an isomer of 1 and 3 (D) 1, 2 and 3 are constitutional isomers Q.6 The correct order of boiling points of compounds I ?IV is (A) II > I > III > IV (B) II > III > I > IV (C) I > III > IV > II (D) I > IV > III > II JAM 2020 CHEMISTRY - CY CY 4/21 Q.7 One of the products of the hydrolysis of calcium phosphide at 25 ? C is (A) phosphine (B) phosphoric acid (C) phosphorus pentoxide (D) white phosphorus Q.8 Treatment of formic acid with concentrated sulfuric acid gives (A) CO + H2O (B) CO2 + H2 (C) HCHO + ½ O2 (D) no product (no reaction) Q.9 The d-orbitals involved in the hybridization to form square planar and trigonal bipyramidal geometries are, respectively, (A) ?? ?? 2 and ?? ?? 2 (B) ?? ???? and ?? ?? 2 (C) ?? ?? 2 -?? 2 and ?? ?? 2 (D) ?? ?? 2 -?? 2 and ?? ???? Q.10 The amino acid with R configuration is (A) (B) (C) (D) Page 5 JAM 2020 CHEMISTRY - CY CY 1/21 Paper Specific Instructions 1. The examination is of 3 hours duration. There are a total of 60 questions carrying 100 marks. The entire paper is divided into three sections, A, B and C. All sections are compulsory. Questions in each section are of different types. 2. Section – A contains a total of 30 Multiple Choice Questions (MCQ). Each MCQ type question has four choices out of which only one choice is the correct answer. Questions Q.1 – Q.30 belong to this section and carry a total of 50 marks. Q.1 – Q.10 carry 1 mark each and Questions Q.11 – Q.30 carry 2 marks each. 3. Section – B contains a total of 10 Multiple Select Questions (MSQ). Each MSQ type question is similar to MCQ but with a difference that there may be one or more than one choice(s) that are correct out of the four given choices. The candidate gets full credit if he/she selects all the correct answers only and no wrong answers. Questions Q.31 – Q.40 belong to this section and carry 2 marks each with a total of 20 marks. 4. Section – C contains a total of 20 Numerical Answer Type (NAT) questions. For these NAT type questions, the answer is a real number which needs to be entered using the virtual keyboard on the monitor. No choices will be shown for this type of questions. Questions Q.41 – Q.60 belong to this section and carry a total of 30 marks. Q.41 – Q.50 carry 1 mark each and Questions Q.51 – Q.60 carry 2 marks each. 5. In all sections, questions not attempted will result in zero mark. In Section – A (MCQ), wrong answer will result in NEGATIVE marks. For all 1 mark questions, 1/3 marks will be deducted for each wrong answer. For all 2 marks questions, 2/3 marks will be deducted for each wrong answer. In Section – B (MSQ), there is NO NEGATIVE and NO PARTIAL marking provisions. There is NO NEGATIVE marking in Section – C (NAT) as well. 6. Only Virtual Scientific Calculator is allowed. Charts, graph sheets, tables, cellular phone or other electronic gadgets are NOT allowed in the examination hall. 7. The Scribble Pad will be provided for rough work. JAM 2020 CHEMISTRY - CY CY 2/21 SECTION – A MULTIPLE CHOICE QUESTIONS (MCQ) Q. 1 – Q.10 carry one mark each. Q.1 The graph that represents the temperature (T) ? entropy (S) variation of a Carnot cycle is (A) (B) (C) (D) Q.2 For the radical chain reaction below, the correct classification for step 2 and step 3 is, respectively, (A) chain propagating, chain terminating (B) chain branching, chain terminating (C) chain propagating, chain propagating (D) chain propagating, chain branching JAM 2020 CHEMISTRY - CY CY 3/21 Q.3 The salt bridge in a galvanic cell allows the flow of (A) ions but NOT electrons (B) BOTH ions and electrons (C) electrons but NOT ions (D) NEITHER ions NOR electrons Q.4 The nucleobase NOT found in DNA is (A) Thymine (B) Uracil (C) Guanine (D) Adenine Q.5 The correct statement for the following structures is (A) 1, 2 and 3 are resonance structures (B) 1 and 2 are resonance structures, whereas 3 is an isomer of 1 and 2 (C) 1 and 3 are resonance structures, whereas 2 is an isomer of 1 and 3 (D) 1, 2 and 3 are constitutional isomers Q.6 The correct order of boiling points of compounds I ?IV is (A) II > I > III > IV (B) II > III > I > IV (C) I > III > IV > II (D) I > IV > III > II JAM 2020 CHEMISTRY - CY CY 4/21 Q.7 One of the products of the hydrolysis of calcium phosphide at 25 ? C is (A) phosphine (B) phosphoric acid (C) phosphorus pentoxide (D) white phosphorus Q.8 Treatment of formic acid with concentrated sulfuric acid gives (A) CO + H2O (B) CO2 + H2 (C) HCHO + ½ O2 (D) no product (no reaction) Q.9 The d-orbitals involved in the hybridization to form square planar and trigonal bipyramidal geometries are, respectively, (A) ?? ?? 2 and ?? ?? 2 (B) ?? ???? and ?? ?? 2 (C) ?? ?? 2 -?? 2 and ?? ?? 2 (D) ?? ?? 2 -?? 2 and ?? ???? Q.10 The amino acid with R configuration is (A) (B) (C) (D) JAM 2020 CHEMISTRY - CY CY 5/21 Q. 11 – Q. 30 carry two marks each. Q.11 At constant pressure, the ? ? ? T diagram for a pure substance that sublimes is (s = solid, l = liquid and g = gas) (A) (B) (C) (D) Q.12 The force constant for H 35 Cl and D 35 Cl are the same and both can be considered as harmonic oscillators. H 35 Cl has a fundamental vibrational transition at 2886 cm -1 . The ratio of the zero-point energy of H 35 Cl to that of D 35 Cl is (A) 0.515 (B) 0.717 (C) 1.395 (D) 1.946Read More
FAQs on Chemistry - 2020 Past Year Paper - IIT JAM Past Year Papers and Model Test Paper (All Branches)
| 1. What is the chemical composition of water? |  |
Ans. Water is composed of two hydrogen atoms and one oxygen atom, giving it the chemical formula H2O. This means that each water molecule consists of two hydrogen atoms bonded to one oxygen atom.
| 2. What are the physical properties of water? | |
Ans. Water has several unique physical properties, including being a liquid at room temperature, having a high boiling point and melting point, and being a good solvent. It also exhibits surface tension, cohesion, and adhesion, which are important for various biological and chemical processes.
| 3. How does water participate in chemical reactions? | |
Ans. Water can participate in chemical reactions through processes such as ionization, hydrolysis, and dehydration synthesis. In ionization, water molecules can dissociate into hydrogen ions (H+) and hydroxide ions (OH-). Hydrolysis involves the breaking of chemical bonds with the addition of water molecules, while dehydration synthesis involves the formation of chemical bonds with the removal of water molecules.
| 4. How does water contribute to the pH scale? | |
Ans. Water plays a crucial role in the pH scale as it is neutral and has a pH of 7. The pH scale measures the concentration of hydrogen ions in a solution, with values below 7 being acidic, values above 7 being basic, and 7 being neutral. Water can act as both an acid and a base, as it can donate a hydrogen ion (H+) or accept a hydroxide ion (OH-), which helps maintain the balance of acidity and alkalinity in various chemical reactions.
| 5. What is the significance of water in living organisms? | |
Ans. Water is essential for life and is involved in numerous biological processes. It serves as a solvent for important molecules such as proteins and carbohydrates, enabling chemical reactions to occur within cells. Water also helps regulate body temperature, acts as a lubricant and cushioning agent, and facilitates the transportation of nutrients and waste products in organisms.
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