Class X Chemistry Guess Paper 2026

Q.2

Predict which system at equilibrium will contain maximum amount of reactant or product.

a) 2CO₂ ⇌ 2CO + O₂ Kc = 3.1 × 10⁻¹⁸ mol/dm³

b) 2O₃ ⇌ 3O₂ Kc = 5 × 10⁵⁵ mol/dm³

OR Describe Chemical equilibrium with the help of graph.

Q.3

Write any four characteristics of equilibrium constant (Kc).

OR For the fixation of Nitrogen following reaction takes place: N₂ + O₂ ⇌ 2NO. When the reaction takes place at 1500 K, the Kc is 1.1 × 10⁻⁵. If equilibrium concentrations of Nitrogen and Oxygen are 1.7 × 10⁻³ mol·dm⁻³ and 6.4 × 10⁻³ mol·dm⁻³ respectively, how much NO is formed?

Q.4

Define amino acid with general formula.

OR Write the possible isomers of Pentane with their common name and IUPAC name.

OR Calculate the pH and [OH⁻] of 0.02M solution of NaOH. (log 2 = 0.3010)

Q.5

Write down the harmful effects on any one of the following:

i) Acid rain

ii) Global warming

OR Explain the diversity of Organic compounds through Catenation and Covalent bond strength with example.

Q.6

Briefly describe primary and secondary pollutants of air.

OR State Vital Force Theory and explain how it was discarded by Friedrich Wöhler.

OR Complete and balance the following acid-base reactions:

a) KOH + HCl →

b) Ca(OH)₂ + HNO₃ →

c) Mg(OH)₂ + H₂SO₄ →

Q.7

What is Nucleic acid? Write importance of Nucleic acid.

OR Write down the important uses of Lipids.

Q.8

Write differences between any one of the following:

i) Saturated and Unsaturated hydrocarbons

ii) Troposphere and Stratosphere

iii) Soft and Hard water

iv) Classical and Advance method

OR Write the importance of Protein.

Q.9

Write down three characteristics of Organic compounds.

OR Describe the preparation of Soft Drink.

Q.10

Write one use of each of the following:

a) Gasoline

b) Kerosene

c) Natural gas

OR Define Physical and Chemical Method of Quantitative analysis.

Q.11

Write disadvantages of Hard Water.

OR Define Error and its types.

Q.12

Predict the direction of Reaction when:

i) Qc < Kc

ii) Qc > Kc

iii) Qc = Kc

OR Write any three uses of Salt with examples.

Q.13

Explain Green House Effect.

OR Give reasons (any two):

i) Why is water considered as universal solvent?

ii) Why number of Carbon compounds are more than of Silicon compounds?

iii) Aquatic life is affected by Acid rain.

iv) The higher the altitude of Stratosphere the temperature is increased.

Q.14

Describe process of Saponification with the help of flow sheet diagram.

OR Explain in detail the preparation of Sugar from Sugarcane.

Q.15

Elaborate all three concepts of Acid and Base with suitable example.

OR Define pH and pOH. Derive the expression of ionization constant of water.

Q.16

State the Law of Mass Action. Derive the expression for the Equilibrium constant for any imaginary reaction.

OR Give a brief account of the natural sources of Organic compounds.

OR Explain briefly any two of the following:

i) Agriculture waste

ii) House-hold waste

iii) Industrial waste

Q.17

What are Carbohydrates? Explain the different types of Carbohydrates on the basis of hydrolysis.

OR What are Vitamins? Explain their different types with sources and also write diseases caused due to their deficiency.