Practical and Analytical Chemistry

Easy Recall (3)Direct Application (3)Concept Trap (1)Calculation (1)

Cation Qualitative Analysis

8 MCQs3 PYQsWorked example

Easy Recall (3)Direct Application (3)Calculation (1)Concept Trap (1)

Detection Extra Elements

Easy Recall (3)Direct Application (3)Concept Trap (2)

Detection Functional Groups

Easy Recall (3)Direct Application (3)Calculation (1)Concept Trap (1)

Enthalpy Solution Neutralization

8 MCQs3 revision cardsWorked example

Direct Application (4)Easy Recall (2)Concept Trap (1)Calculation (1)

Iodoform Preparation

Easy Recall (3)Direct Application (3)Calculation (1)Concept Trap (1)

Kinetic Iodide H₂O₂

8 MCQs3 revision cardsWorked example

Easy Recall (3)Direct Application (3)Concept Trap (1)Calculation (1)

Lyophilic Lyophobic Sols

8 MCQs1 PYQsWorked example

Easy Recall (3)Direct Application (3)Calculation (1)Concept Trap (1)

Mohr Salt Potash Alum

8 MCQs2 PYQs2 revision cardsWorked example

Easy Recall (3)Direct Application (3)Concept Trap (1)Calculation (1)

Titrimetric Acid Base

8 MCQs6 revision cardsWorked example

Easy Recall (3)Direct Application (3)Concept Trap (1)Calculation (1)

Titrimetric Redox

8 MCQs1 PYQs1 revision cardWorked example

Easy Recall (3)Direct Application (3)Calculation (1)Concept Trap (1)

Past-paper questions from this unit

7 questions from NEET 2020, 2021, 2024, 2025, 2026. Answers verified against NTA official keys.

By year in our set: 2020 (1) · 2021 (1) · 2024 (2) · 2025 (1) · 2026 (2)

Lesson: Mohr Salt Potash Alum

NEET 2026

In potash alum, the ratio of K⁺ and SO₄²⁻ ions is

11:2

22:1

32:3

43:2

NTA Answer: Option 1(final)

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Lesson: Titrimetric Redox

NEET 2026

In an acidic medium, 10 mL of 0.25 M oxalic acid is titrated with KMnO₄ solution. If the volume of KMnO₄ solution required to reach end point is 10 mL, the strength of the KMnO₄ solution is

10.10 M

20.20 M

30.25 M

40.15 M

NTA Answer: Option 1(final)

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Match List I with List II List-I (Ion) List-II (Group Number in Cation Analysis) A. Co2+ I. Group-I B. Mg2+ II. Group-III C. Pb2+ III. Group-IV D. Al3+ IV. Group-VI Choose the correct answer from the options given below :

NEET 2025

1A-III, B-II, C-I, D-IV

2A-III, B-IV, C-II, D-I

3A-III, B-IV, C-I, D-II

4A-III, B-II, C-IV, D-I

NTA Answer: Option 3(final)

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Lesson: Mohr Salt Potash Alum

NEET 2024Revised key

During the preparation of Mohr’s salt solution (Ferrous ammonium sulphate), which of the following acid is added to prevent hydrolysis of Fe2+ ion?

1dilute hydrochloric acid

2concentrated sulphuric acid

3dilute nitric acid

4dilute sulphuric acid

NTA Answer: Option 4(revised_final)

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Given below are certain cations. Using inorganic qualitative analysis, arrange them in increasing group number from 0 to VI. A. Al3+ B. Cu2+ C. Ba2+ D. Co2+ E. Mg2+ Choose the correct answer from the options given below.

NEET 2024Revised key

1B, A, D, C, E

2B, C, A, D, E

3E, C, D, B, A

4E, A, B, C, D

NTA Answer: Option 1(revised_final)

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Lesson: Lyophilic Lyophobic Sols

NEET 2021

The right option for the statement "Tyndall effect is exhibited by", is :

1Urea solution

2NaCl solution

3Glucose solution

4Starch solution

NTA Answer: Option 4(final)

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Urea reacts with water to form A which will decompose to form B. B when passed through Cu2+ (aq), deep blue colour solution C is formed. What is the formula of C from the following ?

NEET 2020

1CuCO3 ⋅Cu(OH)2

2CuSO4

3[Cu(NH3 )4 ] 2+

4Cu(OH)2

NTA Answer: Option 3(final)

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Exam traps and common mistakes in this unit

Trap

Cation appears in two analytical groups (e.g. Pb²⁺)

Category: Inorganic Exception

Cations like Pb²⁺ precipitate in BOTH Group I (with HCl) and Group II (with H2S) — assigning to only one group misses the redundancy.

When it triggers

Cation that appears in two analytical groups, e.g. Pb²⁺ (Group I + Group II) or Hg²⁺ vs Hg2²⁺.

How to avoid

Apply confirmatory tests for each candidate group; do not assume mutual exclusivity.

Trap

Overshooting end-point when titrant added rapidly

Category: Overthinking

Continuing to add titrant past the first persistent colour change because the colour seemed to fade after a swirl.

When it triggers

Question describes 'colour faded after swirling' or 'persistent colour' — distinguishes transient vs end-point.

How to avoid

End-point = first PERSISTENT colour change (lasts ≥30 s). Transient fades back to original on swirling.

Trap

Picking indicator without matching its pH-range to the eq pt

Category: Similar Terms

Phenolphthalein (pH 8.2–10) and methyl orange (pH 3.1–4.4) only mark equivalence when the eq-pt pH falls within their range; using the wrong indicator gives an end-point that disagrees with the actual equivalence point.

When it triggers

Titration prompt mentions a specific weak/strong combination but asks which indicator is suitable.

How to avoid

Match the indicator's pH-change range to the equivalence-point pH: phenolphthalein for eq-pt > 7, methyl orange for eq-pt < 7.

Mistake

Mis-assigns a cation to the wrong analytical group (e.g., Pb²⁺ as Group II instead of partial Group I).

Root cause: concept gap

Correction

Pb²⁺ appears in both Group I (PbCl2 white ppt, soluble in hot water) and Group II (PbS black ppt). Confirm with hot-water solubility test.

Mistake

Picks an indicator whose colour-change pH range does not match the equivalence-point pH of the titration.

Root cause: concept gap

Correction

Strong-acid + strong-base: any indicator (eq pt = 7). Weak-acid + strong-base: phenolphthalein (eq pt > 7). Strong-acid + weak-base: methyl orange (eq pt < 7).

Mistake

Adds excess titrant past the colour change because the swirl was too rapid.

Root cause: rushed under time pressure

Correction

Slow drop-wise addition near the end-point; first persistent colour change is the end-point. Re-do if overshot.

Formulas in this unit

Molarity-stoichiometry titration

\frac{M _{a} V _{a}}{n _{a}} = \frac{M _{b} V _{b}}{n _{b}}

Use when normality is awkward (e.g., diprotic acids). Stoichiometric coefficients from balanced equation.

Symbol	Quantity	SI Unit
M	molarity	mol/L
V	volume	L
n	coefficient	-

Valid when

Balanced equation known
Same end-point