Gaseous State Numericals XI Chemistry for MDCAT/ECAT | Important Solved Questions 2026

Welcome to Learn Chemistry by Inam Jazbi! In this post, you’ll find the most important and exam-focused numerical problems on the Gaseous State for Class XI Chemistry (2025 syllabus). These solved numericals are designed to help you understand key gas laws like Boyle’s Law, Charles’s Law, Avogadro’s Law, and the Ideal Gas Equation. Each question is selected from past papers and model tests to help you practice effectively and score full marks in your chemistry exams. Boost your XI Chemistry exam prep with the most important solved numericals on Gaseous State (2025 syllabus). Practice problems from Boyle’s Law, Charles’s Law, and the Ideal Gas Equation — all explained step by step for easy understanding and top marks.

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Tips & Tricks for Solving Gaseous State Numericals

1. Always write down given data clearly:
   Before starting, list all values: pressure (P), volume (V), temperature (T), and moles (n).

2. Convert units carefully:

   • Pressure: 1 atm = 101.3 kPa = 760 mmHg

   • Temperature: Always convert to Kelvin (°C + 273)

3. Use the Ideal Gas Law smartly:

   $$PV=nRT$$

   • R = 0.0821 L·atm/(mol·K)

   • Pick the R value according to units of P, V, and T.

4. Understand the type of problem:

   • Single gas law problem: Use PV = constant, V/T = constant, P/T = constant depending on what’s constant.

   • Mixture of gases: Use Dalton’s Law of Partial Pressure.

5. Temperature conversions matter:
   Always check if the problem gives °C or K. Mistake in temperature causes wrong answers.

6. Volume & pressure relations shortcuts:

   • Boyle’s Law (P₁V₁ = P₂V₂): P up → V down, P down → V up

   • Charles’s Law (V₁/T₁ = V₂/T₂): Temperature ↑ → Volume ↑

7. Moles & Mass Relation:
   Use $n=\frac{mas\mathrm{s/}}{Mola\mathrm{r }mass}$

8. ​Combine with PV = nRT if asked for pressure, volume, or temperature.

9. Keep a quick checklist for final answer:
   ✅ Units correct (L, atm, K, mol)
   ✅ Significant figures
   ✅ Temperature in K

10. Practice previous years’ questions:
    Most MCQs & numerical patterns repeat. Practice 10–15 solved examples before exams.

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