ISC Chemistry Answer Key 2025 (Available): Detailed Solutions PDF Download

ISC Chemistry Answer Key 2025 has been added here for the candidates who want to know the answers for all the questions asked in the examinations.

Arni Sinha

Updated on - Mar 24, 2025 | 5:23:00 PM

ISC Chemistry Answer Key 2025 will be added here (Image Credits: pexels.com).

ISC Chemistry Answer Key 2025: Since the CISCE conducted the Chemistry paper under the ISC 2025 today, February 24, 2025, many students must be wondering about the answers to the questions that were asked. Therefore, those students must check here to get the unofficial ISC Chemistry Answer Key 2025 here. Students will also get the direct link to download the unofficial answer key PDF for the ISC Chemistry 2025 paper. Candidates are advised to go through the detailed answer key and match their responses to get an idea about their performance. Candidates can also be calculate their scores based on the ISC Chemistry Answer Key PDF 2025.

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ISC Chemistry Answer Key 2025: Download Link

Here, in the table below, students can download the ISC Chemistry Unofficial Answer Key 2025, once it has been added.

Particulars	Link
Unofficial ISC Chemistry Answer Key 2025	To Be Added Soon

ISC Chemistry 2025: Question-wise Answers (Available)

Check the ISC Chemistry Answers 2025 provided in the table below for the candidate's reference:

Questions	Answers
(A) Fill in the blanks by choosing the appropriate word(s) from those given:
(i)___________ is an example of a primary cell but ___________ is an example of a secondary cell. (ii) The complex compound [Ni(CO)₄] is ___________ in shape and nickel is in ________ oxidation state in this complex compound. (iii) When acetaldehyde is treated with hydrazine and KOH in a high boiling solvent glycol,____________ is formed and the reaction is known as ________reduction. (iv) The transition metal ions having _________ d-orbitals are colourless and _________ in nature.	(i) dry cell, nickel-cadmium cell (ii) tetrahedral, zero (iii) ethane, Wolff-Kishner (iv) completely filled, diamagnetic
(B) Select and write the correct alternative from the choices given below
(i) Which one of the following can produce the foul smelling compound methyl isocyanide in presence of alcoholic KOH? (a) Chloroform and aniline (b) Chloroform and methanol (c) Chloroform and dimethyl amine (d) Chloroform and methyl amine	(d) Chloroform and methyl amine
(ii) The osmotic pressure of a solution: (P) increases with an increase in number of moles of solute. (Q) decreases with an increase in number of moles of solute. (R) increases at a higher temperature. (S) is dependent on the nature of solute. Which one of the following is correct? (a) Only (P) and (Q) are correct (b) Only (P) and (R) are correct (c) Only (P) and (S) are correct (d) Only (Q) and (S) are correct	(b) Only (P) and (R) are correct
(iii) Which one of the following alcohols is the strongest acid? (a) Phenol (b) Methanol (c) Ethanol (d) t-butyl alcohol	(a) Phenol
(iv) Which one of the following does NOT form a silver mirror on heating with Tollen's reagent? (a) Glucose (b) Fructose (c) Sucrose (d) Lactose	(c) Sucrose
(v) The coordination number and the oxidation state of the central metal 'D' in the complex [D(en)2(H2O)2]Cl3 are: (a) 6 and 2 respectively (b) 4 and 2 respectively (c) 3 and 6 respectively (d) 6 and 3 respectively	(d) 6 and 3 respectively
(vi) Given below are two statements marked Assertion and Reason. Read the two statements carefully and select the correct option. Assertion: The process of halogenation of benzene takes place in the presence of anhydrous FeCl₃. Reason: Anhydrous FeCl₃ prepares nucleophile to attack the benzene ring. (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) Assertion is true and Reason is false.
(vii) Given below are two statements marked Assertion and Reason. Read the two statements carefully and select the correct option. Assertion: The Zr-Hf pair of elements has the same value of atomic radii though Zr and Hf are placed in different periods in the periodic table. Reason: The lanthanoid contraction prevents the expected increase in atomic radii of Hf. (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.	(a) Both Assertion and Reason are true and Reason is the correct explanation for Assertion.