ISC Class 12 Chemistry Specimen Paper 2026-27: Download PDF for CISCE Board Exam

Category

Details

Conducting Body

Council for the Indian School Certificate Examinations (CISCE)

Exam Name

ISC Class 12 Chemistry

Academic Session

2026–27

Exam Date

To be announced 

Paper Type

Theory

Total Marks

70 Marks (Internal Assessment: 30 Marks)

Exam Duration 

3 Hours

Official Website

cisce.org

Question 1

(A) Fill in the blanks by choosing the appropriate word(s) from those given in the brackets.

[methyl alcohol, ethyl alcohol, paired, one, Cannizzaro, d-d, salicylaldehyde, Perkin’s, unpaired, f-f, salicylic acid, Kolbe’s, two, 193000, 96500, Reimer-Tiemann]
(i) Formaldehyde reacts with conc. alkali to give sodium formate and _________ due to the absence of α - hydrogen atom. The reaction is known as _________ reaction. (Recall)
(ii) Electrochemical equivalent (Z) is the quantity of substance deposited or discharged by a charge of ________ coulomb, whereas the equivalent conductance (E) is the amount of substance deposited or discharged by a charge of _________ coulombs. (Understand)
(iii) The colour of transition metal ions is due to ________ electron(s) in d-subshell and _________ transition. (Analyse)
(iv) The product formed when sodium phenoxide is treated with CO2 at 400K, under 4-7 atm pressure and then acidified with dilute HCl is _________. The reaction is known as _______ reaction. (Recall)

(B) Select and write the correct alternative from the choices given below. 

(i) The correct order of freezing point of 0·5M solution of urea, AlCl3, KCl and MgCl2 is:
(a) AlCl3 > MgCl2 > KCl > urea
(b) Urea > KCl > MgCl2 > AlCl3
(c) MgCl2 > KCl > AlCl3 > urea
(d) KCl > MgCl2 > AlCl3 > urea

(ii) Glucose molecules react with (x) number of molecules of phenyl hydrazine to yield glucosazone. The melting point of glucosazone is 2060C. The value of (x) is: 
(a) one
(b) two
(c) three
(d) four

(iii) Cobalt (III) chloride forms several octahedral complexes with ammonia. Which of the following will NOT give a test for chloride ions with silver nitrate solution at 250C? (Understand)
(a) CoCl3.6NH3
(b) CoCl3.5NH3
(c) CoCl3.4NH3
(d) CoCl3.3NH3

(iv) The following data was obtained for a hypothetical reaction 2A+B → 2AB

The rate law expression for this reaction is:

(a) rate = k[A]1 [B]1 

(b) rate = k[A]1 [B]0

(c) rate = k[A]2 [B]1

(d) rate = k[A]0 [B]1

(v) Which of the following reactions will NOT give primary amine?

(a) C2H5NC 𝐿𝑖𝐴𝑙𝐻4 → _________

(b) C2H5CN 𝐿𝑖𝐴𝑙𝐻4 → _________

(c) C2H5CONH2 𝐵𝑟2/𝐾𝑂𝐻 → _________

(d) CH3CONH2 𝐵𝑟2/𝐾𝑂𝐻 → _________

(vi) Given below are two statements marked Assertion and Reason. Read the two statements carefully and select the correct option.
Assertion: When an ether containing a primary alkyl group and tertiary alkyl group is treated with hydrogen iodide, tertiary alkyl iodide is formed.
Reason: The reaction takes place via SN 1 mechanism, and the more stable tertiary carbocation is formed easily which combines with iodide ion to form tertiary alkyl iodide.
(a) Both Assertion and Reason are true, and Reason is the correct explanation for Assertion.
(b) Both Assertion and Reason are true, but Reason is not the correct explanation for Assertion.
(c) Assertion is true and Reason is false.
(d) Both Assertion and Reason are false.

(vii) Given below are two statements marked Assertion and Reason. Read the two statements carefully and select the correct option.
Assertion: Magnesium metal can liberate H2 gas from an aqueous solution of HCl.
Reason: Magnesium has positive value of standard reduction electrode potential. 
(a) Both Assertion and Reason are true, and Reason is the correct explanation for Assertion.
(b) Both Assertion and Reason are true, but Reason is not the correct explanation for Assertion.
(c) Assertion is true and Reason is false.
(d) Both Assertion and Reason are false

(C) Read the passage carefully and answer the questions that follow. [3×1] The hydroxy derivatives of aliphatic hydrocarbons are called alcohols. Ethanol is perhaps the most important aliphatic alcohol. During COVID-19 pandemic alcohol-based sanitizers became an essential protective tool worldwide, reducing the spread of the virus. Nowadays, it is also used as a substitute for petrol in internal combustion engines.

The boiling points of alcohols are considerably higher than those of the corresponding ethers due to the presence of intermolecular hydrogen bonding in alcohols and it increases with increase in molecular mass. For isomeric alcohols the boiling point follows the order:

Primary (1^o ) alcohol > Secondary (2^o ) alcohol > Tertiary (3^o ) alcohol, which is evident from the following data:

Aliphatic alcohols behave as weak acids and ionize to a small extent. Their acidic strength is even less than that of both water and phenol. Phenols are hydroxy derivatives of arenes and have varied application in manufacturing of dyes, plastics, drugs, explosives, etc. At different concentrations, phenols are used both as a disinfectant and an antiseptic.

(i) The boiling point of 2-methyl-propan-2-ol is much lower than that of butan-1-ol, although both have the same molecular formula. Give a reason to explain such observation. (Evaluate)
(ii) Although alcohols are weaker acids than water, phenol is more acidic than alcohols. Justify. (Evaluate)
(iii) In what form (i.e. concentration), does phenol act as a disinfectant or an antiseptic?

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