Organisation : Kerala State Council of Educational Research and Training (SCERT)
Exam : Class X (SSLC)
Document Type : Model/Sample Question Paper
Subject : Chemistry
Term : Summative Assessment (Term III)
Year : 2026
Website : https://scert.kerala.gov.in/sslc2026modq/
SCERT Kerala Class X Chemistry Sample Question Paper
Kerala State Council of Educational Research and Training (SCERT) Class X Chemistry Summative Assessment (Term III) Model/Sample Question Paper 2026.
Related / Similar Question Paper : SCERT Kerala Class X Physics Sample Question Paper 2026
SCERT Kerala Class X Chemistry Sample Questions
Answer all the questions from 1 to 4. Each question carries 1 score. (4 × 1 =4)
1. Assertion (A): A gas having a volume of 44 L at 1 atm pressure will compress to
Reason (R) : According to Boyle’s Law, P1V1=P2V2.
Which among the following is correct? (1)
(A) Both A and R are true, and R is the correct explanation of A.
(B) Both A and R are true, but R is not the correct explanation of A.
(C) A is true, but R is false.
(D) A is false, but R is true.
2 Some statements are given below regarding the element with atomic number 24.
Statement 1. The subshell electron configuration of this element is 1s22s22p63s23p63d44s2
Statement 2. The last electron enters the d subshell.
Statement 3. The l value of the subshell where the last electron enters is 1.
Statement 4. The subshell containing the outermost electron has 5 orbitals.
Which of the following is correct regarding these statements? (1)
A. Statements 1, 2, and 3 are correct, but 4 is not correct.
B. Statements 1, 2, 3, and 4 are correct.
C. Statement 1 is not correct, but 2, 3, and 4 are correct.
D. Statements 1 and 3 are not correct, but 2 and 4 are correct.
3. Which of the following is an acidic salt? (1)
A. NaCl
B. Na2CO3
C. NH4Cl
D. K2SO4
Two questions from 5 to 11 have choice. Each question carries 2 scores : (7×2 =14)
1. A reversible reaction in equilibrium is given.
2NO (g) + O2(g) ⇌ 2NO2 (g) + heat
Write any two changes that should be made in concentration and pressure to increase the amount of nitrogen dioxide in this chemical reaction. (2)
2. (A) A propyne molecule is allowed to react with two hydrogen molecules
(a) Write the chemical equation for this reaction. (1)
(b) Write the IUPAC name of the product. (1)
OR
(B) Ethane reacts with chlorine in the presence of sunlight.
a) What is the name of this chemical reaction? (1)
b) Write the IUPAC name of the product obtained. (1)
3. A zinc rod is kept in CuSO4 solution for some time.
a) What change is observed on the surface of the Zn rod? (1)
b) What is the reason for the fading of the blue colour of the CuSO4 solution? (1)
4.10 L of oxygen at constant temperature and pressure contains X molecules. Answer the questions related to other gas samples at the same temperature and pressure.
a) How many molecules are there in 5 L of hydrogen under the same conditions? (1)
b) What will be the volume of 3X molecules of CO2? (1)
5. Ionisation enthalpy of s block elements are lower than that of p block elements.
a) What is ionisation enthalpy? (1)
b) Which element in the second period has the highest ionisation enthalpy? (1)
6. Incomplete equations related to the concentration of zinc ores are given.
i. ZnCO3 + heat ⟶ —— + CO2
ii. ZnS +O2 + heat ⟶ —— + SO2
(a) Identify X and Y. (1)
(b) How does calcination differ from roasting? (1)
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