Ques. 1JEE Main 2025, 24 January (Morning Shift)
Among the following cations, the number of cations which will give characteristic precipitate in their identification tests with K4[Fe(CN)6] is . Cu2+, Fe3+, Ba2+, Ca2+, NH4+, Mg2+, Zn2+
Principles Related to Practical Chemistry
Previous year questions with solutions · 2024 – 2026
115Questions
58Papers covered
7.37%Weightage 2026▲ 9.4% vs last year
’24
’25
’26
Year-wise statistics questions · papers · average per paper · weightage
| Year | Questions | Papers | Avg / paper | Weightage |
|---|---|---|---|---|
| 2026 | 35 | 19 | 1.8 | 7.37% ▲ 9.4% vs last year |
| 2025 | 32 | 19 | 1.7 | 6.74% ▼ 15.6% vs last year |
| 2024 | 48 | 21 | 2.3 | 7.99% |
Ques. 2JEE Main 2024, 9 April (Evening Shift)
Consider the following test for a group-IV cation. M2+ + H2S A (Black precipitate) + byproduct A + aqua regia B + NOCl + S + H2O B + KNO2 + CH3COOH C + byproduct The spin-only magnetic moment value of the metal complex C is BM (Nearest integer)
Ques. 3JEE Main 2024, 6 April (Evening Shift)
Consider the following reactions NiS + HNO3 + HCl A + NO + S + H2O [figure] The number of protons that do not involve in hydrogen bonding in the product B is .
Ques. 4JEE Main 2024, 5 April (Morning Shift)
[figure] In a borax bead test under hot condition, a metal salt (one from the given) is heated at point B of the flame, resulted in green colour salt bead. The spin-only magnetic moment value of the salt is BM (Nearest integer) [Given atomic number of Cu = 29, Ni = 28, Mn = 25, Fe = 26]
Ques. 5JEE Main 2024, 1 February (Morning Shift)
The number of white coloured salts, among the following is (a) SrSO4 (b) Mg(NH4)PO4 (c) BaCrO4 (d) Mn(OH)2 (e) PbSO4 (f) PbCrO4 (g) AgBr (h) PbI2 (i) CaC2O4 (j) [Fe(OH)2(CH3COO)]
Ques. 6JEE Main 2024, 30 January (Evening Shift)
Number of metal ions characterized by flame test among the following is . Sr2+, Ba2+, Ca2+, Cu2+, Zn2+, Co2+, Fe2+