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Chemistry (Theory) Set 1 2018-2019 ISC (Science) Class 12 Question Paper Solution

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Chemistry (Theory) [Set 1]
Marks: 70Academic Year: 2018-2019
Date: March 2019

[20]1
[4]1.a
[1]1.a.i

 Fill in the blanks by choosing the appropriate word/words from those given in the brackets: 
(more than, primary, cathode, Lucas reagent, two, four, less than, Grignard’s reagent, tertiary anode, zero, equal to, three)
 The elevation of boiling point of 0.5 M K2SO4 solution is ________ that of 0.5 M urea solution. The elevation of boiling point of 0.5 M KCl solution is _______ that of 0·5 M K2SO4 solution. 

Concept: Relative Molecular Mass of Non-volatile Substances - Elevation in Boiling Point Method
Chapter: [1.03] Relative molecular mass of non-volatile substances
[1]1.a.ii

 Fill in the blanks by choosing the appropriate word/words from those given in the brackets: 
(more than, primary, cathode, Lucas reagent, two, four, less than, Grignard’s reagent, tertiary anode, zero, equal to, three)
A mixture of conc. HCl and anhydrous ZnCl2 is called _______ which shows maximum reactivity with _________ alcohol. 

Concept: Collision Theory of Chemical Reactions
Chapter: [3.02] Collision Theory [3.04] Effect of temperature on the rate constant of a reaction
[1]1.a.iii

 Fill in the blanks by choosing the appropriate word/words from those given in the brackets: 
 In electrolytic refining the impure metal is made ________ while a thin sheet of pure metal is used as ___________.

Concept: Dissociation- Electrolytic Solute - Meaning of Electrolytic Solute
Chapter: [1.02] Dissociation- Electrolytic solute
[1]1.a.iv

Fill in the blanks by choosing the appropriate word/words from those given in the brackets: 
When the concentration of  reactant of first order reaction  is doubled, the rate of reaction becomes ________ times, but for a ________ order reaction, the rate of reaction remains the same. 

Concept: Meaning of Chemical Kinetics - Slow and Fast Reactions
Chapter: [3.07] Meaning of Chemical Kinetics
[4]1.b
[1]1.b.i

Select the correct alternative from the choices given :
 The cell reaction is spontaneous or feasible when emf of the cell is:

negative

positive

zero

either positive or negative 

Concept: Electrochemistry - Batteries
Chapter: [6.05] Batteries
[1]1.b.ii

 Select the correct alternative from the choices given :
 Which, among the following polymers, is a polyester: 

 melamine 

bakelite

 terylene 

polythene

Concept: Polymers - Uses of Polymer
Chapter: [0.16] Polymers
[1]1.b.iii

Select the correct alternative from the choices given :
The correct order of increasing acidic strength of the oxoacids of chlorine is: 

  HClO3 < HClO4 < HClO2 < HClO 

HClO < HClO2 < HClO3 < HClO

HClO2 < HClO < HClO4 < HClO3 

HClO3 < HClO4 < HClO < HClO

Concept: P - Block Group 17 Elements - Concept of Group 17 Elements
Chapter: [0.08] Chemistry of p-Block Elements: Group 16, 17, 18
[1]1.b.iv

Select the correct alternative from the choices given :
 A catalyst is a substance which: 

changes the equilibrium constant of the reaction 

 increases the equilibrium constant of the reaction 

supplies energy to the reaction 

shortens the time reach equilibrium 

Concept: Meaning of Chemical Kinetics - Scope and Importance of Kinetics of the Reaction
Chapter: [3.07] Meaning of Chemical Kinetics
[4]1.c

 Match the following: 
(i) Diazotisation             (a) Anisotropic
(ii) Crystalline solid       (b) Reimer-Tiemann reaction
(iii) Phenol                     (c) Diphenyl

Concept: Meaning of Chemical Kinetics - Scope and Importance of Kinetics of the Reaction
Chapter: [3.07] Meaning of Chemical Kinetics
[4]1.d
[1]1.d.i

Answer the followiiig questions: 
Which trivalent ion has maximum size in the Lanthanoid series i.e. Lanthanum ion (La3+) to Luteium ion (Lu3+)? 
(at. no. of Lanthanum  = 57 and Lutetium = 71) 

Concept: F-block Elements - The Lanthanoids
Chapter: [0.1] Chemistry of Transition and Inner-Transition Elements: d-Block: 3d, 4d and 5d series f-Block: 4f and 5f series
[1]1.d.ii

 Answer the followiiig questions: 
When coordination compound  3 3 .6 CoCl NH is mixed with 3, AgNO three moles of AgCl are precipitated per mole of the compound. Write the stuctural formula and IUPAC name of the coordination compound. 
[ Co ( NH3)6 ]  Cl3
Hexamine cobalt (III) chloride

Concept: Coordination Compounds - IUPAC rules of nomenclature of coordination compounds
Chapter: [0.07] Coordination Compounds
[1]1.d.iii

Answer the followiiig questions: 
Calculate the boiling point of urea solution when 6 g of urea is dissolved in 200 g of water.
(Kb for water = 0.52 K kg mol–1, bolining point of pure water = 373 K, mol. wt. of urea = 60) 

Concept: Relative Molecular Mass of Non-volatile Substances - Elevation in Boiling Point Method
Chapter: [1.03] Relative molecular mass of non-volatile substances
[1]1.d.iv

Answer the followiiig questions: 
Identify the compounds A, B, C and D in the given reaction:

Concept: Introduction of Aldehydes, Ketones and Carboxylic Acids
Chapter: [13.01] Carbonyl compounds
[2]2
[2]2.a

 For a reaction , A + B → C+D  the initial rate for different reactions and initial concentrations of reactants are given below:

S.NO.                     Initial Conc.  Initial rate (mole L–1 sec–1
[ A] mole L–1  [B] mole L–1 
1 1.0 1.0 `2xx10^-3`
2 2.0 1.0 `4xx10^-3`
3 4.0 1.0 `8xx10^-3`
4 1.0 2.0 `2xx10^-3`
5 1.0 4.0 `2xx10^-3`

(i) What is the overall order of reaction?
(ii) Write the rate law equation.

Concept: Meaning of Chemical Kinetics - Scope and Importance of Kinetics of the Reaction
Chapter: [3.07] Meaning of Chemical Kinetics
OR
[2]2.b

25% of first order reaction is completed in 30 minutes. Calculate the time taken in minutes for the reaction to go to 90% completion. 

Concept: Meaning of Chemical Kinetics - Scope and Importance of Kinetics of the Reaction
Chapter: [3.07] Meaning of Chemical Kinetics
[2]3
[1]3.a

Name the type of drug which lowers the body temperature in high fever condition.

Concept: Chemicals in Medicines
Chapter: [0.18] Chemistry in Everyday Life
[1]3.b

What are tranquilizers? Give one example of tranquilizer.

Concept: Chemicals in Medicines
Chapter: [0.18] Chemistry in Everyday Life
[2]4
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[1]4.a

Write the balanced chemical equation of the following:

Chlorobenzene treated with ammonia in the presence of Cu2O at 475 K and 60 atm.

Concept: Chlorobenzene
Chapter: [11.04] Chlorobenzene
[1]4.b

Write the balanced chemical equation of the following:

Ethyl chloride treated with alcoholic potassium hydroxide.

Concept: Preparation, Properties, and Uses of the Following: Ethyl Bromide, Chloroform, Iodoform, Haloform Reaction
Chapter: [11.05] Preparation, properties, and uses of the following
[2]5
[1]5.a

Name the monomer and the type of polymerisation that takes place when PTFE is formed.

Concept: Polymers - Polymerisation
Chapter: [0.16] Polymers
[1]5.b

Name the monomers of nylon 6, 6.

Concept: Polymers - Nylon 6
Chapter: [0.16] Polymers
[2]6

Name two water-soluble vitamins and the diseases caused by their deficiency in the diet of an individual.

Concept: Vitamins - Vitamin Deficiency Diseases
Chapter: [0.17] Biomolecules – carbohydrates, proteins, enzymes, vitamins and nucleic acids
[2]7
[2]7.a

How will you obtain the following? (Give balanced chemical equation):

Benzene from phenol. 

Concept: Chlorobenzene - Reduction to Benzene
Chapter: [11.04] Chlorobenzene

How will you obtain the following? (Give balanced chemical equation):

Iodoform from ethanol 

Concept: Chlorobenzene - Reduction to Benzene
Chapter: [11.04] Chlorobenzene
OR
[2]7.b

Give a balanced equation for the preparation of salicylaldehyde from phenol.

Concept: Alcohols - Methods of Preparation
Chapter: [12.01] Methods of preparation, manufacture, properties and use

How will you obtain the following? (Give balanced chemical equation): Propan-2-ol from Grignard’s reagent.

Concept: Preparation, Properties and Uses of Propane-1, 2, 3 Triol - Propane – 1, 2, 3-triol
Chapter: [12.02] Preparation, properties and uses of ethane-1, 2 diol, propane-1, 2, 3 triol
[2]8

Show that for a first-order reaction the time required to complete 75% of reaction is about 2 times more than that required to complete 50% of the reaction.

Concept: Order of a Reaction - Mathematical Derivation of Rate Equation for First Order Reaction
Chapter: [3.01] Order of a reaction
[3]9
[3]9.a

When 0.4g of oxalic acid is dissolved in 40g of benzene, the freezing point of the solution is lowered by 0.45 K. Calculate the degree of association of acetic acid. Acetic acid forms dimer when dissolved in benzene.
(Kf for benzene = 5.12 K kg mol-1, at. wt. C = 12, H = 1, O = 16)

Concept: Aldehydes and Ketones - Preparation of Aldehydes
Chapter: [14.02] Acid derivatives
OR
[3]9.b

A solution is prepared by dissolving 9.25 g of non-volatile solute in 450 mL of water. It has an osmotic pressure of 350 mm of Hg at 27°C. Assuming the solute is non-electrolyte, determine its molecular mass. (R = 0.0821 lit atm K-1 mol-1)

Concept: Solubility - Solubility of a Gas in a Liquid
Chapter: [1.01] Raoult's law and colligative properties
[3]10

An element occurs in a body-centred cubic structure. Its density is 8.0 g/cm3. If the cell edge is 250 pm, calculate the atomic mass of an atom of this element. (N0 = 6.023 × 1023)

Concept: States of Matters: Structure and Properties Solid State - Calculation of Density of Unit Cell
Chapter: [0.02] States of Matters: Structure and Properties Solid State
[3]11
[1]11.a

Describe the role of the Cryolite in the extraction of aluminium from pure alumina.

Concept: Occurrence of Metals
Chapter: [0.1] Chemistry of Transition and Inner-Transition Elements: d-Block: 3d, 4d and 5d series f-Block: 4f and 5f series
[1]11.b

Describe the role of the NaCN in the extraction of silver from silver ore.

Concept: Use in Laboratory and in Photography
Chapter: [0.1] Chemistry of Transition and Inner-Transition Elements: d-Block: 3d, 4d and 5d series f-Block: 4f and 5f series
[1]11.c

What is the role of coke in the extraction of iron from its oxides?

Concept: Occurrence of Metals
Chapter: [0.1] Chemistry of Transition and Inner-Transition Elements: d-Block: 3d, 4d and 5d series f-Block: 4f and 5f series
[3]12
[1]12.a

Write the IUPAC names of the K3(Fe(C2O4)3).

Concept: Coordination Compounds - IUPAC rules of nomenclature of coordination compounds
Chapter: [0.07] Coordination Compounds

Write the IUPAC names of the Co(NH3)5ClSO4

Concept: Coordination Compounds - IUPAC rules of nomenclature of coordination compounds
Chapter: [0.07] Coordination Compounds
[2]12.b

[Fe(CN)6]4- is a coordination complex ion.
Calculate the oxidation number of iron in the complex.

Concept: Ionic Equilibria - Common Ion Effect Example
Chapter: [5.07] Common ion effect

[Fe(CN)6]4- is a coordination complex ion.

Is the complex ion diamagnetic or paramagnetic?

Concept: Ionic Equilibria - Common Ion Effect Example
Chapter: [5.07] Common ion effect

[Fe(CN)6]4- is a coordination complex ion.
What is the hybridisation state of the central metal atom? 

Concept: Ionic Equilibria - Common Ion Effect Example
Chapter: [5.07] Common ion effect

[Fe(CN)6]4- is a coordination complex ion.

Write the IUPAC name of the complex ion. 

Concept: Ionic Equilibria - Common Ion Effect Example
Chapter: [5.07] Common ion effect
[3]13
[3]13.a

Explain why transition elements form alloys.

Concept: General Properties of the Transition Elements (D-block)
Chapter: [0.1] Chemistry of Transition and Inner-Transition Elements: d-Block: 3d, 4d and 5d series f-Block: 4f and 5f series

Explain why Zn2+ salts are white whereas Cu2+ salts are coloured.

Concept: General Properties of the Transition Elements (D-block)
Chapter: [0.1] Chemistry of Transition and Inner-Transition Elements: d-Block: 3d, 4d and 5d series f-Block: 4f and 5f series

Explain why transition metals and their compounds act as a catalyst.

Concept: General Properties of the Transition Elements (D-block)
Chapter: [0.1] Chemistry of Transition and Inner-Transition Elements: d-Block: 3d, 4d and 5d series f-Block: 4f and 5f series
OR
[3]13.b

Complete and balance the chemical equations:

KMnO4 + H2SO4 + H2C2O4 → ____ + ____ + ____ + _____ 

Concept: Preparation, Properties, and Uses of the Following: Ethyl Bromide, Chloroform, Iodoform, Haloform Reaction
Chapter: [11.05] Preparation, properties, and uses of the following

Complete and balance the chemical equations:

K2Cr2O7 + H2SO4 + KI → ____ + _____ + _____ + _____.

Concept: Preparation, Properties, and Uses of the Following: Ethyl Bromide, Chloroform, Iodoform, Haloform Reaction
Chapter: [11.05] Preparation, properties, and uses of the following

Complete and balance the chemical equations:

K2Cr2O7 + H2SO4 + FeSO4 → _____ + _____ + _____ + _____ 

Concept: Preparation, Properties, and Uses of the Following: Ethyl Bromide, Chloroform, Iodoform, Haloform Reaction
Chapter: [11.05] Preparation, properties, and uses of the following
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[3]14
[1]14.a

Give balanced equation for the following:

Aniline is treated with bromine water. 

Concept: Aniline - Aniline
Chapter: [0.15] Cyanides, Isocyanides, Nitro compounds, Amines and Diazonium Salt
[1]14.b

Give balanced equation for the following:

Ethylamine is heated with chloroform and alcoholic solution of potassium hydroxide.

Concept: Preparation, Properties, and Uses of the Following: Ethyl Bromide, Chloroform, Iodoform, Haloform Reaction
Chapter: [11.05] Preparation, properties, and uses of the following
[1]14.c

Give balanced equation for the following:

Benzene diazonium chloride is treated with an ice-cold solution of aniline in acidic medium. 

Concept: Preparation, Properties, and Uses of the Following: Ethyl Bromide, Chloroform, Iodoform, Haloform Reaction
Chapter: [11.05] Preparation, properties, and uses of the following
[3]15
[1]15.a

Define the following term with suitable examples:

Peptisation

Concept: Dissociation- Electrolytic Solute - Meaning of Electrolytic Solute
Chapter: [1.02] Dissociation- Electrolytic solute
[1]15.b

Define the following term with suitable examples:

Electrophoresis.

Concept: Dissociation- Electrolytic Solute - Numericals
Chapter: [1.02] Dissociation- Electrolytic solute
[1]15.c

Define the following term with suitable examples:

Dialysis 

Concept: Relative Molecular Mass of Non-volatile Substances - Osmotic Pressure and Its Application in the Determination of Relative Molecular Mass
Chapter: [1.03] Relative molecular mass of non-volatile substances
[5]16
[5]16.a

Calculate the mass of silver deposited at cathode when a current of 2 amperes is passed through a solution of AgNO3 for 15 minutes.
(at. wt. of Ag= 108, 1F = 96500 C)

Concept: States of Matters: Structure and Properties Solid State - Calculation of the Number of Atoms per Unit Cell
Chapter: [0.02] States of Matters: Structure and Properties Solid State

Calculate the emf and ΔG for the cell reaction at 298 K
Mg(s)|Mg2+(0.1 M) || CU2+(0.01 M)|Cu(s)
Given E°cell = 2.71 V
1F = 96,500 C

Concept: States of Matters: Structure and Properties Solid State - Calculation of the Number of Atoms per Unit Cell
Chapter: [0.02] States of Matters: Structure and Properties Solid State
OR
[5]16.b

Define the following term Specific conductance.

Concept: Electrolytic Conductance - Specific Conductance
Chapter: [6.04] Electrolytic conductance

Define the following term Kohlrausch’s Law.

Concept: Electrochemistry - Kohlrausch's law
Chapter: [6.04] Electrolytic conductance
[5]17
[5]17.a
[3]17.a.i

Explain why:

(1) Fluorine has a lower electron affinity than chlorine.
(2) Red phosphorus is less reactive than white phosphorus.
(3) Ozone acts as a powerful oxidising agent.

Concept: P - Block Group 16 Elements - Ozone
Chapter: [0.08] Chemistry of p-Block Elements: Group 16, 17, 18 [0.09] Preparation/ Manufacture, Properties and Uses of Compounds of Groups 16, 17, – Ozone, Sulphur Dioxide, Sulphuric Acid, Hydrochloric Acid
[2]17.a.ii

Draw the structures of the following :
(1) XeF6
(2) IF7

Concept: Bonding in Coordination Compounds - Crystal Field Theory (CFT)
Chapter: [0.07] Coordination Compounds
OR
[5]17.b
[3]17.b.i

Explain why:

(1) Interhalogen compounds are more reactive than the related elemental halogens.
(2) Sulphur exhibits the tendency for catenation but oxygen does not.
(3) On being slowly passed through water, PH3 forms bubbles but NH3 dissolves.

Concept: P - Block Group 17 Elements - Interhalogen Compounds
Chapter: [0.08] Chemistry of p-Block Elements: Group 16, 17, 18
[2]17.b.ii

Complete and balance the following reactions:

(1) P4 + H2SO4 → ____ + _____ + _____ + _____
(2) Ag + HNO3(dilute) → _____ + ______ + _____ + _____

Concept: Bonding in Coordination Compounds - Crystal Field Theory (CFT)
Chapter: [0.07] Coordination Compounds
[5]18
[5]18.a
[3]18.a.i

Give balanced chemical equations for the following reactions:

(1) Acetaldehyde reacts with hydrogen cyanide.
(2) Acetone reacts with phenylhydrazine.
(3) Acetic acid is treated with ethanol and a drop of conc. H2SO4.

Concept: Introduction of Aldehydes, Ketones and Carboxylic Acids
Chapter: [13.01] Carbonyl compounds
[2]18.a.ii

Give one chemical test each to distinguish between the following pairs of compounds:
(1) Acetone and benzaldehyde.
(2) Phenol and benzoic acid.

Concept: Introduction of Aldehydes, Ketones and Carboxylic Acids
Chapter: [13.01] Carbonyl compounds
OR
[5]18.b
[3]18.b.i

Write chemical equations to illustrate the following name reactions:
(1) Aldol condensation.
(2) Cannizzaro’s reaction.
(3) Benzoin condensation.

Concept: Aldehydes and Ketones - Base Catalysed Reactions
Chapter: [13.01] Carbonyl compounds
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[2]18.b.ii

Identify the compounds A and B in the given reactions:

(1) 

(2)

\[\ce{CH3COCH3 ->[{[O]}][HNO3(conc.)]A->[PCl5]B}\]

Concept: Aldehydes and Ketones - Lab Preparation from Toluene, Oxidation by Chromyl Chloride
Chapter: [13.01] Carbonyl compounds

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CISCE previous year question papers Class 12 Chemistry (Theory) with solutions 2018 - 2019

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