CBSE Class 10 Science Answer Key 2025 (Available): Set-wise Unofficial Key PDF, Exam Analysis

The CBSE Class 10 Science exam was conducted on February 20, 2025, in offline mode. The exam was conducted for a total of 3 hours. The total marks for the theory exam were 80. The Science paper for CBSE class 10 Exam 2025 was divided into 5 sections: A, B, C, D, and E. Section A consisted of MCQ questions, Section B consisted of short answer questions I, Section C consisted of short answer questions II, Section D consisted of long answer questions, and Section E consisted of case-based questions. The marking scheme differs depending on the type of questions.

The candidates can check below the set-wise CBSE Class 10 Science Answer Key 2025 along with the question paper and exam analysis.

CBSE Class 10 Science Exam 2025 Difficulty Level: Student Reaction

We have updated here the students' reaction to the CBSE Class 10 Science exam:

• The overall difficulty level of the exam was Easy to moderate.
• Section A was easy with direct questions. However, some of the options were confusing.
• Section B was of a moderate difficulty level, and some of the questions were tricky.
• Section C was also easy and not time-consuming.
• Section D was of a moderate to tough difficulty level. Some of the questions were time-consuming.
• Section E was also of a moderate difficulty level.

CBSE Class 10 Science Exam Analysis 2025

The table below overviews the complete CBSE Class 10 Science Answer Key 2025 exam analysis:

Particulars	Analysis
Overall Difficulty Level	Easy to moderate
Difficulty Level of Section A	Easy
Difficulty Level of Section B	Moderate
Difficulty Level of Section C	Easy to moderate
Difficulty Level of Section D	Moderate to Tough
Difficulty Level of Section E	Moderate
Topics with Highest Weightage in Exam	Chemical Substances - Nature and Behaviour
Expected Number of Good Attempts	60+

CBSE Class 10 Science Answer Key 2025 PDF

We have updated below the unofficial answer key for the CBSE Class 10 Science exam. The candidates can download the CBSE Class 10 Science answer key in PDF form by clicking on the link below:

Paper Set 1 Solutions (31/31):

Q. 1 and 2:

Q.1 Ans: Option C

Q.2 Ans: Option B

Q.3: The most common method of extraction of metals from their oxide ores is:

Ans: Option A (Reduction with Carbon)

Q.4

Ans: Option C ((ii) and (iv))

Q.5 Choose the incorrect option statement about the common reaction used in the hydrogenation of vegetable oils.

Ans: Option D (It is an addition reaction which occurs in the presence of an acid catalyst)

Q.6

Ans: Option D

Q.7 The part of the brain which maintains the posture and balance of the body is:

Ans: Option C (Cerebellum)

Q.8 The plant hormone present in greater concentration in the areas of rapidly dividing cells is:

Ans: Option B (Cytokinins)

Q. 9 Select a pair of bisexual flowers from the following:

Ans: Option B (Hibiscus and mustard)

Q. 10 The gastric glands present in the wall of the stomach release:

Ans: Option C (Mucus and pepsin)

Q. 11 In the following experimental setup of electrolysis of water, if P and Q are the gases collected in the test tubes enclosing the electrodes R and S, then select the option/options in which the matching is correct:

(i) P-Oxygen gas, R-Anode

(ii) P-Hydrogen gas, R-Cathode

(iii) Q-Hydrogen gas, S-Cathode

(iv) Q-Oxygen gas, S-Anode

(A) (i) and (ii)

(B) (iii) and (iv)

(C) (i) and (iii)

(D) (ii) and (iv)

Ans: Option C (i) and (iii)

Q. 12 A Hydrocarbon which does not belong to the same homologous series of carbon compounds is

(A) C₄H₁₀

(B) C₇H₁₄

(C) C₆H₁₄

(D) C₁₀H₂₂

Ans: Option B (C₇H₁₄₎

Q. 14 Select from the following a statement that is not true about burning of magnesium ribbon in the air:

(A) It burns with a dazzling white flame.

(B) A white powder is formed on burning.

(C) It is an endothermic reaction.

(D) It is an example of a combination reaction.

Ans: Option C (It is an endothermic reaction.)

Q. 15 You have three aqueous solutions A, B and C as given below:

A - Potassium nitrate

B - Ammonium chloride

C - Sodium carbonate

The ascending order of the pH of these solutions is:

(A) A < B < C

(B) B < C < A

(C) C < A < B

(D) B < A < C

Ans: Option B ( B < C < A)

Q. 16 The colour of the solution observed after about 1 hour of placing iron nails in copper sulphate solution is

(A) Blue

(B) Pale green

(C) Yellow

(D) Reddish brown

Answer:  Option B (Pale green)

Q. 17 Juice of tamarind turns blue litmus to red. It is because of the presence of a chemical compound called

CBSE Class 10 Science Unofficial Answer Keys 2025 PDF

CBSE Class 10 Science Question Paper 2025 PDF

In the link provided below, we have updated the CBSE Class 10 Science question paper. The candidates can download the question paper for CBSE Class 10 Science in PDF form by clicking on the link below:

Set	Question Paper PDF
Set A	Download PDF
Set B	Download PDF
Set C	Download PDF