Chemistry Specimen Paper Sec-A 2023 Solved for ISC Class-12. Step by step solutions as council prescribe guideline of model sample question paper. During solutions of Chemistry specimen paper we explain with figure , graph, table whenever necessary. Student can achieve their goal in next upcoming exam of council. Visit official website CISCE for detail information about ISC Board Class-12.
Chemistry Specimen Paper Sec-A 2023 Solved for ISC Class-12
| Board | ISC |
| Class | 12th (xii) |
| Subject | Chemistry (Section-A) |
| Topic | ISC Specimen Paper Solved |
| Syllabus | on Revised syllabus |
| Session | 2022-23 |
Chemistry Specimen Paper Sec-A 2023 Solved for ISC Class-12
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ISC SPECIMEN QUESTION PAPER 2023
Chemistry Paper 1 (Theory)
Time Allowed: Three hours
(Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time).
- This paper is divided into four sections – A, B, C and D.
- Answer all questions.
- Section A consists of one question having sub-parts of one mark each.
- Section B consists of seven questions of two marks each.
- Section C consists of nine questions of three marks each, and
- Section D consists of three questions of five marks each.
- Internal choices have been provided in two questions each in Section B, Section C and Section D.
The intended marks for 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 working must be shown. In working out problems, use the following data:
- Avogadro’s number = 6.023 x 10²³
SECTION A – 14 MARKS
ISC Class-12 Chemistry Specimen Paper 2023 Solved sec-A
Question 1:
(A) Fill in the blanks by choosing the appropriate word(s) from those given in the brackets:
[two, Williamson’s synthesis, three, anisole, toluene, Friedel-Crafts alkylation, iodoform, sec-¹ , mol-¹L sec-¹
, Lewis base, acetone, Lewis acid, chloroform, formaldehyde]
(i) Sodium phenoxide reacts with methyl chloride to give __sodium Chloride _. The reaction is known as _Williamson’s synthesis____.
(ii) When the concentration of a reactant of first order reaction is tripled, the rate of reaction becomes _Two__ times. The unit of rate constant (k) for the first order reaction is _ mol L – 1 s – 1__.
(iii) In coordination complexes, the central metal atom or ion behaves as _ lewis acid. _ and the ligands behave as _Lewis bases_.
(iv) Calcium acetate on dry distillation gives _Acetone._ which gives _ iodoform _ on heating with iodine and alkali.
(B) Select and write the correct alternative from the choices given below:
(i) An alkyl isocyanide on complete reduction gives :
(a) Primary amine.
(b) Secondary amine.
(c) Tertiary amine.
(d) Carboxylic acid.
Ans : (b) Secondary amine.
(ii) For a spontaneous reaction Eº cell and ∆Gº will be respectively:
(a) -ve and -ve
(b) -ve and +ve
(c) +ve and -ve
(d) +ve and +ve .
Ans : (b) -ve and +ve
(iii) Which of the following pairs of transition elements have exceptional electronic configuration?
(a) Sc and Cu
(b) Fe and Ni
(c) Cr and Cu
(d) Mn and Zn
Ans: (c) Cr and Cu
(iv) For a first order reaction, when 100g of the reactant is taken, 75g of the reactant reacts in 8 minutes. If 200g of the same reactant is taken, in how much time 150g of the reactant will react?
(a) 8 minutes
(b) 16 minutes
(c) 20 minutes
(d) 24 minutes.
Ans: update soon
(C) Match the following:
(i) Phenol (a) Osmotic pressure
(ii) Ethylenediamine (b) Zwitter ion
(iii) Colligative property (c) Neutral FeCl3 solution
(iv) Amino acid (d) Bidentate ligand.
Answer:
(ii) Ethylenediamine (d) Bidentate ligand.
(iii) Colligative property (a) Osmotic pressure
(D)
(i) Assertion: Specific conductance of all electrolytes decreases on dilution.
Reason: On dilution, number of ions per unit volume decreases.
(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.
Ans : (a) Both assertion and reason are true and reason is the correct explanation of assertion.
(ii) Assertion: Nitration of chlorobenzene leads to the formation of m-nitro chlorobenzene.
Reason: Nitro (-NO2) group is a m-directing group.
(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.
Answer:
(ii) (d) Assertion is false but reason is true.
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