CBSE CLASS 10 CHEMISTRY MODEL PAPER 2026: YOUR GUIDE TO A PERFECT SCORE

Chemistry is the "scoring engine" of your Science paper. In the CBSE 10th class board exam 2026, the board is shifting toward competency-focused questions. This means you need to understand the logic behind chemical equations rather than just memorizing them.

This model paper covers the entire NCERT syllabus with a focus on the most high-weightage topics.

Section A: Objective Type Questions (1 Mark Each)

Q1. When a magnesium ribbon is burnt in air, it produces a dazzling white flame and changes into a white powder. The chemical name of this powder is:

  • (a) Magnesium Hydroxide ($Mg(OH)_2$)

  • (b) Magnesium Oxide ($MgO$)

  • (c) Magnesium Carbonate ($MgCO_3$)

  • (d) Magnesium Chloride ($MgCl_2$)

Q2. Which of the following salts does not contain "Water of Crystallization"?

  • (a) Blue Vitriol

  • (b) Baking Soda

  • (c) Washing Soda

  • (d) Gypsum

Q3. The correct order of reactivity of the following metals is:

  • (a) $Al > Mg > Zn > Fe$

  • (b) $Mg > Al > Zn > Fe$

  • (c) $Fe > Zn > Al > Mg$

  • (d) $Zn > Fe > Mg > Al$

Q4. Assertion (A): Sodium and Potassium are stored under kerosene oil.

Reason (R): They are highly reactive metals and react vigorously with oxygen and moisture in the air.

  • (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.

Section B: Short Answer Questions (2 Marks Each)

Q5. Identify the substance oxidized and the substance reduced in the following redox reaction:

$$CuO + H_2 \rightarrow Cu + H_2O$$

Q6. Why do ionic compounds have high melting and boiling points?

Section C: Analytical Short Answers (3 Marks Each)

Q7. (a) What is the "Chlor-alkali process"? Why is it called so?

(b) Write the balanced chemical equation for this process.

Q8. (a) Define a "Homologous Series" of carbon compounds.

(b) Write the molecular formula of the next two members of the series starting with Methane ($CH_4$).

Section D: Long Answer Questions (5 Marks Each)

Q9. (a) Differentiate between Roasting and Calcination with one chemical equation for each.

(b) How is refined copper obtained from impure copper? Explain the process of electrolytic refining.

Q10. (a) What is Saponification? Write the chemical equation for the reaction.

(b) Explain the mechanism of the cleaning action of soap with the help of a labeled diagram.

Section E: Case-Based Questions (4 Marks)

Q11. Case Study: pH in Our Daily Life

The pH of our stomach is approximately 2.0 due to the secretion of $HCl$. During indigestion, the stomach produces too much acid, leading to pain and irritation. To neutralize this, people use "Antacids."

  1. What is the chemical nature of an Antacid? (1M)

  2. Give an example of a mild base used as an antacid. (1M)

  3. How does the pH change in our mouth lead to tooth decay? (2M)

✅ Answer Key & Quick Solutions

  • Q1: (b) $MgO$. Magnesium reacts with Oxygen to form Magnesium Oxide.

  • Q2: (b) Baking Soda ($NaHCO_3$) is an anhydrous salt.

  • Q3: (b) Magnesium is the most reactive in this group.

  • Q5: $H_2$ is oxidized to $H_2O$; $CuO$ is reduced to $Cu$.

  • Q6: Due to the strong electrostatic force of attraction between the oppositely charged ions, which requires a large amount of energy to break.

  • Q9 (Hint): Roasting is used for Sulphide ores (heating in excess air), while Calcination is used for Carbonate ores (heating in limited air).

Pro-Tip for 2026: In Chemistry, always balance your equations! A correct reaction that isn't balanced might only get you half-marks. Use a pencil to draw micelle or electrolytic refining diagrams to keep your paper neat.

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