Principles Related To Practical Chemistry NEET PYQs (2005–2026) with Solutions

4 solved Principles Related To Practical Chemistry PYQs

Real NEET and AIPMT questions from this chapter, newest first. Try each one, then open the answer and the step-by-step explanation.

1. Question 1 (NEET 2025)

   NEET 2025MediumQualitative Salt Analysis

   Match List I with List II Choose the correct answer from the options given below:

   1. AOption A: A-III, B-IV, C-II, D-I
   2. BOption B: A-III, B-IV, C-I, D-II
   3. COption C: A-III, B-II, C-IV, D-I
   4. DOption D: A-II, B-II, C-I, D-IV

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   Correct answer: (B) A-III, B-IV, C-I, D-II

   Explanation

   In qualitative inorganic analysis: • Co2+ belongs to Group IV • Mg2+ belongs to Group VI • Pb2+ belongs to Group I • Al3+ belongs to Group III Thus: A → III B → IV C → I D → II Hence the correct option is (2).

2. Question 2 (NEET 2019)

   NEET 2019EasyDry cleaning solvent

   The liquified gas that is used in dry cleaning along with a suitable detergent is

   1. AOption A: $CO_2$
   2. BOption B: Water gas
   3. COption C: Petroleum gas
   4. DOption D: $NO_2$

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   Correct answer: (A) $CO_2$

   Explanation

   Liquified carbon dioxide ($CO_2$) is used in dry cleaning with a suitable detergent because it acts as an environmentally safer cleaning solvent.

3. Question 3 (AIPMT 2014)

   AIPMT 2014MediumKjeldahl Method for Estimation of Nitrogen

   In the Kjeldahl's method for estimation of nitrogen present in a soil sample, ammonia evolved from 0.75 g of sample neutralized 10 mL of 1 M H₂SO₄. The percentage of nitrogen in the soil is:

   1. AOption A: 37.33
   2. BOption B: 45.33
   3. COption C: 35.33
   4. DOption D: 43.33

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   Correct answer: (A) 37.33

   Explanation

   10 mL of 1 M H₂SO₄ contains 0.01 mol H₂SO₄. From H₂SO₄ + 2NH₃ → (NH₄)₂SO₄, moles of NH₃ = 2 × 0.01 = 0.02 mol. Nitrogen present = 0.02 × 14 = 0.28 g. Therefore, percentage nitrogen = (0.28/0.75) × 100 = 37.33%.

4. Question 4 (AIPMT 2010)

   AIPMT 2010MediumIndustrial Processes

   Match List I (substances) with List II (processes) employed in manufacture and select the correct option:

   1. AOption A: Option (1)
   2. BOption B: Option (2)
   3. COption C: Option (3)
   4. DOption D: Option (4)

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   Correct answer: (D) Option (4)

   Explanation

   Sulphuric acid → Contact process, Steel → Bessemer's process, Sodium hydroxide → Leblanc process, Ammonia → Haber's process.