Practical Chemistry JEE Main previous year questions with solutions

5 solved JEE Main questions on Practical Chemistry, free to read — no sign-in needed. The full chapter has 157 questions; sign in to attempt the remaining 152 in the exam simulator.

Answers checked against the official answer keys.

1. Q1JEE Main 2026 (22 Jan, Shift 2)Equivalence concept
   Identify the correct statements : A. Hydrated salts can be used as primary standard. B. Primary standard should not undergo any reaction with air. C. Reactions of primary standard with another substance should be instantaneous and stoichiometric. D. Primary standard should not be soluble in water. E. Primary standard should have low relative molar mass. Choose the correct answer from the options given below :
   1. A.A, B, C and E Only
   2. B.A, B and E Only
   3. C.A, B and C Only
   4. D.D and E Only
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   Answer: (C)

   Primary standard must be soluble for standard solution formation
2. Q2JEE Main 2025 (24 Jan, Shift 1)Identification of Basic Radicals
   Among the following cations, the number of cations which will give characteristic precipitate in their identification tests with $\mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]$ is _____. $\mathrm{Cu}^{2+}, \mathrm{Fe}^{3+}, \mathrm{Ba}^{2+}, \mathrm{Ca}^{2+}, \mathrm{NH}_4^{+}, \mathrm{Mg}^{2+}, \mathrm{Zn}^{2+}$
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   Answer: 3

   $\mathrm{Cu}^{2+}, \mathrm{Ca}^{2+} \& \mathrm{Zn}^{2+}$ will form precipitate with $\mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right] . \mathrm{Fe}^{3+}$ forms coloured solution
3. Q3JEE Main 2024 (01 Feb, Shift 1)Preliminary Tests
   The number of white coloured salts among the following is ....... $\left(A\right){SrSO}_{4}\left(B\right)Mg\left({NH}_{4}\right){PO}_{4}\left(C\right){BaCrO}_{4}$ $\left(D\right)Mn(OH{)}_{2}\left(E\right){PbSO}_{4}\left(F\right){PbCrO}_{4}$ $\left(G\right)AgBr\left(H\right){PbI}_{2}\left(I\right){CaC}_{2}{O}_{4}$ $\left(J\right)\left[Fe(OH{)}_{2}\left({CH}_{3}COO\right)\right]$
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   Answer: 5

   The colour of the salts are as follows, ${SrSO}_{4}$- white $Mg\left({NH}_{4}\right){PO}_{4}$ - white ${BaCrO}_{4}$ - yellow $Mn(OH{)}_{2}$ - white ${PbSO}_{4}$ - white ${PbCrO}_{4}$ - yellow $AgBr$ - pale yellow ${PbI}_{2}$ - yellow ${CaC}_{2}{O}_{4}$ - white $\left[Fe(OH{)}_{2}\left({CH}_{3}COO\right)\right]$ – Brown Red Hence the number of salts which are white in colour is $5$.
4. Q4JEE Main 2023 (25 Jan, Shift 1)Properties of D-block elements
   Match the List-I with List-II : Cations Group reaction $P\rightarrow {Pb}^{2+},{Cu}^{2+}$ ${H}_{2}S$ gas in presence of dilute $HCl$ $Q\rightarrow {Al}^{3+},{Fe}^{3+}$ ${\left({NH}_{4}\right)}_{2}{CO}_{3}$ in presence of ${NH}_{4}OH$ $R\rightarrow {Co}^{2+},{Ni}^{2+}$ ${NH}_{4}OH$ in presence of ${NH}_{4}CI$ $S\rightarrow {Ba}^{2+},{Ca}^{2+}$ ${H}_{2}S$ in presence of ${NH}_{4}OH$
   1. A.$P\rightarrow i,Q\rightarrow iii,R\rightarrow ii,S\rightarrow iv$
   2. B.$P\rightarrow iv,Q\rightarrow ii,R\rightarrow iii,S\rightarrow i$
   3. C.$P\rightarrow iii,Q\rightarrow i,R\rightarrow iv,S\rightarrow ii$
   4. D.$P\rightarrow i,Q\rightarrow iii,R\rightarrow iv,S\rightarrow ii$
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   Answer: (D)

   Group reagents for precipitating ions: Group Cations Group reagent Zero ${NH}_{4}^{+}$ None I ${Pb}^{2+}$ Dilute HCl II ${Pb}^{2+},{Cu}^{2+},{As}^{3+}$ ${H}_{2}S$ gas in presence of dil. HCl III ${Al}^{3+},{Fe}^{3+}$ ${NH}_{4}OH$ in presence of ${NH}_{4}Cl$ IV ${Co}^{2+},{Ni}^{2+},{Mn}^{2+},{Zn}^{2+}$ ${H}_{2}S$ in presence of ${NH}_{4}OH$ V ${Ba}^{2+},{Sr}^{2+},{Ca}^{2+}$ $({NH}_{4}{)}_{2}{CO}_{3}$ in presence of ${NH}_{4}OH$ VI ${Mg}^{2+}$ None So, the correct answer is $P\rightarrow i,Q\rightarrow iii,R\rightarrow iv,S\rightarrow ii$
5. Q5JEE Main 2022 (28 Jul, Shift 1)
   For kinetic study of the reaction of iodide ion with ${H}_{2}{O}_{2}$ at room temperature : (A) Always use freshly prepared starch solution. (B) Always keep the concentration of sodium thiosulphate solution less than that of $KI$ solution. (C) Record the time immediately after the appearance of blue colour. (D) Record the time immediately before the appearance of blue colour. (E) Always keep the concentration of sodium thiosulphate solution more than that of $KI$ solution. Choose the correct answer from the options given below
   1. A.$\left(A\right),\left(B\right),\left(C\right)$ only
   2. B.$\left(A\right),\left(D\right),\left(E\right)$ only
   3. C.$\left(D\right),\left(E\right)$ obly
   4. D.$\left(A\right),\left(B\right),\left(E\right)$ only
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   Answer: (A)

   For kinetic study of the reaction of iodide ion with ${H}_{2}{O}_{2}$ at room temperature following Precautions needs to be used. Always keep the concentration of sodium thiosulphate solution less than that of potassium iodide solution. Always use freshly prepared starch solution. Use fresh samples of hydrogen peroxide and potassium iodide. Always use the same measuring cylinders for measuring solutions in two different sets of observations. If after measuring one solution, the cylinder is used for measuring another solution, clean it before using. Record the time immediately after the appearance of blue colour.So, among the given statements only the statement $\left(A\right),\left(B\right),and\left(C\right)$ are correct.