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

 

POST 2: CHEMISTRY MODEL PAPER (CBSE 10TH - 2026)

Title: Final Chemistry Practice Paper for CBSE Class 10 Board Exam 2026

Labels: Chemistry, CBSE 2026, Science Exam, Chemical Reactions

Chemistry: Reactions, Balances & Properties

Chemistry rewards those who can write balanced equations and identify functional groups accurately.

Section A: MCQs (1 Mark each)

  1. Which of the following is an example of a double displacement reaction?

    • (a) $Fe + CuSO_4 \rightarrow FeSO_4 + Cu$

    • (b) $Na_2SO_4 + BaCl_2 \rightarrow BaSO_4 + 2NaCl$

    • (c) $CaO + H_2O \rightarrow Ca(OH)_2$

    • (d) $2Pb(NO_3)_2 \rightarrow 2PbO + 4NO_2 + O_2$

  2. The chemical formula of Plaster of Paris is:

    • (a) $CaSO_4 \cdot 2H_2O$

    • (b) $CaSO_4 \cdot \frac{1}{2}H_2O$

    • (c) $CaSO_4 \cdot H_2O$

    • (d) $2CaSO_4 \cdot H_2O$

Section B: Short Answer (2 Marks each)

  1. Why should curd and sour substances not be kept in brass and copper vessels?

  2. Identify the substance oxidized and the substance reduced in: $MnO_2 + 4HCl \rightarrow MnCl_2 + 2H_2O + Cl_2$.

Section C: Analytical (3 Marks each)

  1. (a) What is an alloy? Give one example.

    (b) Why do ionic compounds have high melting points?

  2. Explain the structural difference between Saturated and Unsaturated hydrocarbons with one example each.

Section D: Long Answer (5 Marks each)

  1. (a) Write the chemical name and formula of Baking Soda.

    (b) How is it prepared? Write the equation.

    (c) What happens when it is heated during cooking?

    (d) List two uses of Baking Soda.

Section E: Case-Study (4 Marks)

  1. Reactivity Series: Based on a table of reaction observations of four metals A, B, C, and D with various salt solutions.

    • (i) Which is the most reactive metal?

    • (ii) What would you observe if B is added to a solution of Copper(II) sulfate?

Final Chemistry Tip: If you forget a color in a salt analysis question, remember: Copper salts are usually blue/green, and Iron(II) is pale green, while Iron(III) is reddish-brown.


Post 2: Chemistry Answer Key

  • Q1: (b) $Na_2SO_4 + BaCl_2 \rightarrow BaSO_4 + 2NaCl$ (Exchange of ions).

  • Q2: (b) $CaSO_4 \cdot \frac{1}{2}H_2O$ (Calcium Sulphate Hemihydrate).

  • Q3: These contain organic acids which react with Copper/Zinc (in brass) to form toxic metallic compounds.

  • Q4: Oxidized: $HCl$ (loses hydrogen to form $Cl_2$). Reduced: $MnO_2$ (loses oxygen).

  • Q5: (a) Homogeneous mixture of two or more metals/non-metals. Example: Brass ($Cu + Zn$). (b) Due to strong electrostatic forces of attraction between oppositely charged ions.

  • Q6: Saturated: Single bonds (e.g., Methane). Unsaturated: Double/Triple bonds (e.g., Ethene/Ethyne).

  • Q7: (a) Sodium Hydrogen Carbonate ($NaHCO_3$). (b) $NaCl + H_2O + CO_2 + NH_3 \rightarrow NH_4Cl + NaHCO_3$. (c) Releases $CO_2$ gas, making bread/cake fluffy.

  • Q8: (i) Metal B (displaces iron). (ii) B will displace Copper from $CuSO_4$ (Blue solution will fade, reddish-brown Copper will deposit).

 

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