Kerala Plus Two Chemistry Important Questions For Board Exams 2026 Download PDF

As the DHSE Kerala Plus Two Chemistry exam is scheduled for Tuesday, March 10, 2026, students can utilise the important questions shared here for quick preparation. Chemistry is a high-scoring topic that necessitates a strategic combination of mastering complex organic reactions, comprehending inorganic coordination concepts, and correctly calculating physical chemistry numericals. To assist you negotiate the 60-mark terminal test efficiently, students can find a detailed guide with the most critical questions and last-minute recommendations.

Also check: Kerala Plus Two Time Table 2026

Kerala Plus Two Chemistry Exam 2026: Key Highlights

As the exam is nearing, students can check out the key exam details from here. 

Kerala Plus Two Chemistry Exam 2026: Important questions

Students can check out Kerala Plus Two Chemistry important questions from here to do a quick practice for the exam. 

1. Crystal defects give rise to certain special properties in the solids. 

a) What is meant by the Frenkel Defect?

b) Why does LiCI not exhibit Frenkel Defect?

c) Explain the pink colour of LiCI when heated in . the vapours of Li.

2. Solids can be classified into three types on the basis of their electrical conductivities. Name three types of solids classified on the basis of electrical conductivities.

ii) How will you explain such classification based on Band theory?

3. Unit cells can be broadly classified into 2 categories: primitive and centred unit cells.

a) What is a unit cell?

b) Name the three types of centred unit cells.

c) The unit cell dimension of a particular crystal system is a = b = c, a = ß = ? = 90°. ldentify the crystal system.

d) Give one example for the above crystal system.

4. a) Zero order reaction means that the rate of a reaction is independent of the concentration of reactants. 

i) Write an example for a zero order reaction.

ii) Write the integral rate expression for the zero order reaction, R→ P.

b) The temperature dependence of the rate of a chemical relation can be accurately explained by the Arrhenius equation. With the help of Arrhenius equation , calculate the rate constant for the first order reaction C2H5l(g) → C2H4(g) + Hl(g) at 700K. Energy of activation (Ea) for the reaction is 209 kJ moh1 and rate constant at 600 K is 1.60 x 10-5 S-1 [Universal gas constant R = 8.314 JK-1 mol-1]

5. The terms order and molecularity are common in chemical kinetics. 

a) What do you mean by order and molecularity?

b) i) Write two factors influencing the rate of a reaction.

ii) Winter Arrhenius equation.

6. The effect of temperature on rate of reaction is given by the Arrhenius equation. 

i) Write Arrhenius equation.

ii) Define activation energy (Ea).

iii) Rate constant K2 of a reaction at 310 K is two times of its rate constant K., at 300 K. Calculate activation energy of the reaction. (1og2 0.3010, log 1=0)

7. Transition metals are widely used as catalysts in industrial processes. 

a) Name any two industrial processes in which transition elements are used as catalysts.

b) Transition metals exhibit catalytic properties. Why?

c) Why do the transition elements exhibit greater similarity in properties compared to main group elements along the period as well as down the group?

8. a) Atomic sizes increase as we come down a group, but in the 4th group of the Periodic Table Zr, Hf have almost the same atomic sizes. Why?

b) E° (standard electrode potential) values generally become less negative as we move across a transition series, but E° values of Ni2+/Ni and Zn2+/Zn values are exceptions. Justify.

9. Transition elements are d – block elements, with some exceptions. Usually they are paramagnetic. They show variable oxidation states. They and their compounds show the catalytic property. 

a) Zn (Atomic number 30) is not a transition element, though it is a d – block element. Why?

b) Which is more paramagnetic Fe2+ or Fe3+? Why?

c) Why do transition elements show variable oxidation states?.

d) What is the reason for their catalytic property?

10. Proteins are the polymers of a-amino acids. The structure and shape of proteins can be discussed at four different levels, namely, primary, secondary, tertiary and quaternary. Give an account of structure and shape of proteins considering the above four levels.

11. a) Carbohydrates are classified into monosaccharides, oligosaccharides and polysaccharides. 

i) What is the basis of such classification? Explain.

ii) Give an example for an oligosaccharide.

b) Vitamin ‘C’ is a vitamin found in fruits and vegetables. It cannot be stored in our body. Why?

12. Proteins are important polymers of biological systems. 

i) What is the denaturation of proteins?

ii) Give two examples of denaturation.

13. a) Name a fast soluble vitamin. Suggest a disease caused by its deficiency. (Say – 2014)

b) What do you mean by the following :

i) Secondary structure of proteins.

ii) Nucleosides.

14. Cane Sugar, Glucose and Starch are carbohydrates.

a) Represent the structure of Glucose.

b) Write a method to prepare Glucose from Starch. Write the chemical equation of the reaction.

c) Suggest any two uses of Carbohydrates.

15. a) Which of the following is a polysaccharide? 

i) Maltose

ii) Sucrose

iii) Fructose

iv) Cellulose

b) Explain the amphoteric behaviour of amino acids.

16. Mixture of conc. HCI and anhydrous ZnCl2 is an important reagent which helps to distinguish between 10, 20 and 3° alcohols.

a) Give the name of the above reagent.

b) Give one example each for 10, 20 & 30 alcohols.

c) Explain how the above reagent helps to distinguish above three types of alcohols.

17. a) Write the IUPAC names of all the possible isomers with molecular formula C3H8O. 

b) Phenol is usually manufactured from cumene. Write the structure of cumene.

c) Primary, secondary and tertiary alcohols can be distinguished by Lucas test.

i) What is Lucas reagent?

ii) Write the observation for primary, secondary and tertiary alcohols in Lucas test.

18. a) How will you prepare the following compounds using Grignard reagent? 

i) Primary alcohol

ii) Secondary alcohol

b) How will you distinguish primary and secondary alcohols using the Lucas test?

c) Write the correct pair of reactants for the preparation of t-butyl ethyl ether by Williamson synthesis.

19. When CuSO4 is mixed with an excess of NH3, a deep blue coloured solution is obtained.

a) Write the formula of the compound formed.

b) What is the IUPAC name of the compound?

c) What do you understand by the term coordination number and ligand in a coordination compound?

d) Give the oxidation number and coordination number of the central metal atom of the deep blue coloured compound.

20. The geometry and magnetic properties of complexes can be explained by V.B. Theory. 

The octahedral complex [Co(NH3]6]3+ is diamagnetic while the octahedral complex [C0F6]3- is diamagnetic. Explain using VB Theory.

Kerala Plus Two Chemistry Exam Important questions: Download PDF

Given here is Kerala Plus Two Chemistry Exam important questions shared in a PDF. Students can access the PDF link from the table shared below.