ISC Chemistry Semester-2 Solved Specimen Paper 2022 Class-12

ISC Chemistry Semester-2 Solved Specimen / Model / Sample Paper 2022 Class-12 for practice.  Step by step solutions of ISC Class-12 specimen model sample paper. During solutions of semester-2 Chemistry specimen paper we explain with figure , graph, table whenever necessary so that student can achieve their goal in next upcoming exam of council .

ISC Chemistry Semester-2 Solved Specimen / Model / Sample Paper 2022 Class-12

Board ISC
Class  12th (XII)
Subject Chemistry
Topic Semester-2 ISC Specimen Paper Solved
Syllabus  on bifurcated syllabus (after reduction)
session 2021-22
Question Type  Descriptive Type  (as prescribe by council)
Total question Total-14 (Section A, B & C)
Max mark 35

Warning :- before viewing solution view Question Paper

Solved Class-12 for practice Set of Chemistry Semester-2 ISC Specimen Model Sample Paper 


SECTION A – 7 MARKS

Question 1:

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)

(i) 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 __________.

(ii) The transition metals show ___________ character because of the presence of unpaired electrons while Cu+ is ___________ because its electronic configuration is [Ar]3d10 .

(iii) Calcium formate on distillation gives ___________ but the distillation of calcium formate and calcium acetate gives ___________.

Question 2:

Select and write the correct alternative from the choices given below.

(i) The type of hybridization involved in Octahedral complexes is: 

(a) sp³

(b) dsp²

(c) sp³d

(d) d²sp³

(ii) One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of 44 amu. The alkene is:

(a) ethene

(b) propene

(c) 1-butene

(d) 2-butene

(iii) Primary amine when warmed with chloroform and alc. KOH yields:

(a) cyanides

(b) isocyanides

(c) benzene diazonium chloride

(d) secondary amines

(iv) Assertion: The conversion of fresh precipitate to colloidal state is called peptization.
Reason: It is caused by addition of common ions.

(a) Both assertion and reason are true and reason is the correct explanation of assertion.

(b) Both assertion and reason are true but reason is not the correct explanation for assertion.

(c) Assertion is true but reason is false.

(d) Assertion is false but reason is true


SECTION B – 16 MARKS

Question 3:

Name the type of isomerism shown by each of the following pairs of compounds:

(i) [CoCl2(NH3)4]Cl.H2O and [CoCl(H2O)(NH3)4]Cl2

(ii) [Cr(NH3)5Br]SO4 and [Cr(NH3)5SO4]Br

Question 4:

(i) Write chemical equations to illustrate each of the following name reactions:

(a) Rosenmund’s reduction

(b) Clemmensen’s reduction

OR

(ii) How will you bring about the following conversions? (Give equation).

(a) Acetic acid to acetone

(b) Formaldehyde to urotropine

Question 5:

What is a zwitter ion? Represent the zwitter ion of glycine

Question 6:

(i) Arrange the following in the increasing order of their basic strength: C2H5NH2, C6H5NH2, (C2H5)2NH.

(ii) What are the products formed when benzene diazonium chloride reacts with phenol in weak alkaline medium? (Give equation).

Question 7:

Give reasons for the following:

(i) Diabetic patients are advised to take artificial sweeteners instead of natural sweeteners.

(ii) The use of aspartame is limited to cold foods and drinks.

Question 8:

The rate of reaction becomes four times when the temperature changes from 293K to 313K. Calculate the energy of activation (Ea) of the reaction assuming that it does not change with temperature. (R = 8·314 JK-1mol-¹)

Question 9:

Give balanced equation for each of the following:

(i) Ethylamine and nitrous acid

(ii) Aniline and acetyl chloride

Question 10:

Give one chemical test for each to distinguish between the following pairs of compound:

(i) Acetaldehyde and benzaldehyde

(ii) Acetone and acetic acid


SECTION C – 12 MARKS

Question 11:

(i) Answer the following:

(a) Define molecularity of a reaction. Give one difference between the order of reaction and its molecularity.

(b) The rate constant (k) of a first order reaction is 4·5 x 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?

OR

(ii) Answer the following:

(a) For a first order reaction, show that the time required for the completion of 99% reaction is twice the time required for the completion of 90% of the reaction.

(b) For a reaction, rate = k[A]¹ [B]1.5[C]0 . What is the overall order of reaction?

Question 12:

(i) What is the basic difference between the electronic configuration of transition and inner transition elements?

(ii) Why are Zn2+ ions colourless while Ni2+ ions are green in colour?

Question 13:

(i) Write the formula of each of the following compounds:

(a) Potassium trioxalatoaluminate (III)

(b) Triammine triaquachromium (III) chloride

(ii) For the complex ion [Co(NH3)6]3+, state the oxidation state of central metal atom and the coordination number of the complex ion.

Question 14:

Give reason for each of the following:

(i) For ferric hydroxide sol. the coagulating power of phosphate ion is more than chloride ion.

(ii) Lyophilic colloidal solutions are more stable than lyophobic colloidal solutions.

(iii) Gelatin is added to ice cream

ISC Chemistry Semester-2 Solved Specimen / Model / Sample Paper 2022 Class-12


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