ISC (Commerce)
ISC (Arts)
ISC (Science)
Academic Year: 2021-2022
Date: एप्रिल 2022
Duration: 1h30m
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Note :
- Candidates are allowed an additional 10 minutes for only reading the paper.
- They must NOT start writing during this time.
- All Questions are compulsory.
- The intended marks or parts of questions are given in brackets. [ ]
- All working, including rough work, should be done on the same sheet as, and adjacent to the rest of the answer.
- Balanced equations must be given wherever possible and diagrams where they are helpful.
- When solving numerical problems, all essential work must be shown.
In working out problems, use the following data:
Gas constant R = 1⋅987 deg-1 K-1 mol-1 = 8·314 JK-1 mol-1 = 0·0821 dm3 atm K-1 mol-1 1 l atm = 1 dm3 atm = 101⋅3 J. 1 Faraday = 96500 coulombs.
Avogadro's number = 6·023 ·1023.
Fill in the blanks by choosing the appropriate word(s) from those given in the brackets:
(two, four, sec-1, diamagnetic, acetaldehyde, mol-1L sec-1, paramagnetic, formaldehyde, acetone, ethanol)
When the concentration of a reactant of first-order reaction is doubled, the rate of reaction becomes ______ times. The unit of rate constant (k) for the first-order reaction is ______.
Chapter: [0.0301] Order of a reaction
Fill in the blanks by choosing the appropriate word(s) from those given in the brackets:
(two, four, sec-1, diamagnetic, acetaldehyde, mol-1L sec-1, paramagnetic, formaldehyde, acetone, ethanol)
The transition metals show ______ character because of the presence of unpaired electrons while Cu+ is ______ because its electronic configuration is [Ar]3d10.
Chapter: [0.1] Chemistry of Transition and Inner-Transition Elements: d-Block: 3d, 4d and 5d series f-Block: 4f and 5f series
Fill in the blanks by choosing the appropriate word(s) from those given in the brackets:
(two, four, sec-1, diamagnetic, acetaldehyde, mol-1L sec-1, paramagnetic, formaldehyde, acetone, ethanol)
Calcium formate on distillation gives ______ but the distillation of calcium formate and calcium acetate gives ______.
Chapter: [0.131] Carbonyl compounds
The type of hybridization involved in Octahedral complexes is ______.
sp3
dsp2
sp3d
d2sp3
Chapter: [0.07] Coordination Compounds
One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of 44 amu. The alkene is:
ethene
propene
1-butene
2-butene
Chapter: [0.131] Carbonyl compounds
Primary amine when warmed with chloroform and alc. KOH yields:
cyanides
isocyanides
benzene diazonium chloride
secondary amines
Chapter: [0.15] Cyanides, Isocyanides, Nitro compounds, Amines and Diazonium Salt
Assertion: The conversion of fresh precipitate to colloidal state is called peptization.
Reason: It is caused by addition of common ions.
Both assertion and reason are true and reason is the correct explanation of assertion.
Both assertion and reason are true but reason is not the correct explanation for assertion.
Assertion is true but reason is false.
Assertion is false but reason is true.
Chapter: [0.19] Surface Chemistry
Name the type of isomerism shown by the following pair of compounds:
[CoCl(H2O)(NH3)4]Cl2 and [CoCl2(NH3)4]Cl.H2O
Chapter: [0.07] Coordination Compounds
Name the type of isomerism shown by the following pair of compounds:
[Cr(NH3)5Br]SO4 and [Cr(NH3)5SO4]Br
Chapter: [0.07] Coordination Compounds
Write a chemical equation to illustrate the following name reaction:
Rosenmund’s reduction
Chapter: [0.131] Carbonyl compounds
Give a balanced equation for the following name reaction:
Clemmensen’s reduction.
Chapter: [0.131] Carbonyl compounds
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How will you bring about the following conversion? (Give equation).
Acetic acid to acetone
Chapter: [0.141] Carboxylic acids
How will you bring about the following conversion? (Give equation).
Formaldehyde to urotropine
Chapter: [0.131] Carbonyl compounds
What is a zwitter ion?
Chapter: [0.17] Biomolecules – carbohydrates, proteins, enzymes, vitamins and nucleic acids
Represent the zwitter ion of glycine.
Chapter: [0.17] Biomolecules – carbohydrates, proteins, enzymes, vitamins and nucleic acids
Arrange the following in the increasing order of their basic strength:
C2H5NH2, C6H5NH2, (C2H5)2NH
Chapter: [0.15] Cyanides, Isocyanides, Nitro compounds, Amines and Diazonium Salt
What happens when benzene diazonium chloride reacts with phenol in the weak alkaline medium?
(Give a balanced equation).
Chapter: [0.141] Carboxylic acids
Give reason for the following:
Diabetic patients are advised to take artificial sweeteners instead of natural sweeteners.
Chapter: [0.18] Chemistry in Everyday Life
Give reason for the following:
The use of aspartame is limited to cold foods and drinks.
Chapter: [0.18] Chemistry in Everyday Life
The rate of reaction becomes four times when the temperature changes from 293 K to 313 K. Calculate the energy of activation (Ea) of the reaction assuming that it does not change with temperature. (R = 8.314 JK-1 mol-1)
Chapter: [0.0304] Effect of temperature on the rate constant of a reaction
Give the balanced equation for the following:
Ethylamine and nitrous acid
Chapter: [0.15] Cyanides, Isocyanides, Nitro compounds, Amines and Diazonium Salt
Give the balanced equation for the following:
Aniline and acetyl chloride
Chapter: [0.15] Cyanides, Isocyanides, Nitro compounds, Amines and Diazonium Salt
Give one chemical test to distinguish between the following pair of compounds:
Acetaldehyde and benzaldehyde
Chapter: [0.131] Carbonyl compounds
Give one chemical test to distinguish between the following pairs of compounds:
Acetone and acetic acid
Chapter: [0.141] Carboxylic acids
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Define molecularity of a reaction.
Chapter: [0.0311] Molecularity of the reaction
Give one difference between the order of reaction and its molecularity.
Chapter: [0.030299999999999997] Mechanism of the reaction
The rate constant (k) of a first-order reaction is 4.5 × 10-2 sec-1. What will be the time required for the initial concentration of 0.4 M of the reactant to be reduced to 0.2 M?
Chapter: [0.030299999999999997] Mechanism of the reaction
Show that the time required for 99% completion is double of the time required for the completion of 90% reaction.
Chapter:
For a reaction, rate = k[A]1 [B]1.5 [C]0. What is the overall order of reaction?
Chapter: [0.031] Effect of concentration of reactants on the rate of a reaction
What is the basic difference between the electronic configuration of transition and inner transition elements?
Chapter: [0.1] Chemistry of Transition and Inner-Transition Elements: d-Block: 3d, 4d and 5d series f-Block: 4f and 5f series
Why are Zn2+ ions colourless while Ni2+ ions are green in colour?
Chapter: [0.1] Chemistry of Transition and Inner-Transition Elements: d-Block: 3d, 4d and 5d series f-Block: 4f and 5f series
Using IUPAC norms write the formulae for Potassium trioxalatoaluminate(III)
Chapter: [0.07] Coordination Compounds
Write the formula of the following compound:
Triammine triaquachromium (III) chloride
Chapter: [0.114] Chlorobenzene
For the complex ion [Co(NH3)6]3+, state the oxidation state of central metal atom and the coordination number of the complex ion.
Chapter: [0.07] Coordination Compounds
Give a Reason for the Following:
For Ferric Hydroxide Sol. the Coagulating Power of Phosphate Ion is More than Chloride Ion.
Chapter: [0.142] Acid derivatives
Give reason for the following:
Lyophilic colloidal solutions are more stable than lyophobic colloidal solutions.
Chapter: [0.19] Surface Chemistry
Give the reason for the following:
Gelatin is added to ice creams.
Chapter: [0.0301] Order of a reaction
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CISCE previous year question papers Class 12 Chemistry (Theory) with solutions 2021 - 2022
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