Practical & Analytical Chemistry · JEE Main previous year questions

2026 5 questions

1. Q532026 · 8 Apr 2026 · Shift 2

   Bromine trifluoride autoionizes to form $\mathrm{Br}{\mathrm{F}}_2^{\oplus }$ and $\mathrm{Br}{\mathrm{F}}_4^{\ominus }$. The shapes of the cation and anion are respectively ____ , and ____ .

   1. A.bent, square planar
   2. B.linear, square planar
   3. C.bent, see-saw
   4. D.linear, tetrahedral
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   Answer: A

2. Q702026 · 6 Apr 2026 · Shift 2

   Treatment of a gas '$X$' with a freshly prepared ferrous sulphate solution gives a compound '$Y$' as a brown ring. The compounds $X$ and $Y$ are.

   1. A.$\text{NO}$ and $[\text{Fe}(\text{NO})]{\text{SO}}_4$
   2. B.${\text{NO}}_2$ and $[\text{Fe}({\text{NO}}_2)]{\text{SO}}_4$
   3. C.${\text{N}}_2\text{O}$ and $[\text{Fe}({\text{N}}_2\text{O})]{\text{SO}}_4$
   4. D.${\text{N}}_2{\text{O}}_4$ and $[\text{Fe}({\text{N}}_2{\text{O}}_4)]{\text{SO}}_4$
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   Answer: A

3. Q692026 · 4 Apr 2026 · Shift 2

   Among $\mathrm{F}{\mathrm{e}}^{3+}$, $\mathrm{P}{\mathrm{b}}^{2+}$, $\mathrm{C}{\mathrm{u}}^{2+}$ and $\mathrm{M}{\mathrm{n}}^{2+}$, identify the one that gets precipitated out while passing ${\mathrm{H}}_2\mathrm{S}$ in presence of $\mathrm{N}{\mathrm{H}}_4\mathrm{OH}$ as group reagent. The highest possible oxidation state of the corresponding metal is

   1. A.+3
   2. B.+4
   3. C.+2
   4. D.+7
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   Answer: D

4. Q702026 · 2 Apr 2026 · Shift 1

   A salt with few drops of conc. $\mathrm{HCl}$ gives apple green colour in flame test. The group precipitate of the salt is dissolved in acetic acid and treated with ${\mathrm{K}}_2\mathrm{Cr}{\mathrm{O}}_4$ to give yellow precipitate. When the sodium carbonate extract of the salt solution is heated with conc. $\mathrm{HN}{\mathrm{O}}_3$ and ammonium molybdate, it resulted a canary yellow precipitate. The cation and anion present in the salt are respectively,

   1. A.$\mathrm{C}{\mathrm{a}}^{2+}$ and $\mathrm{S}{\mathrm{O}}_4^{2-}$
   2. B.$\mathrm{B}{\mathrm{a}}^{2+}$ and $\mathrm{P}{\mathrm{O}}_4^{3-}$
   3. C.$\mathrm{M}{\mathrm{n}}^{2+}$ and $\mathrm{P}{\mathrm{O}}_4^{3-}$
   4. D.$\mathrm{B}{\mathrm{a}}^{2+}$ and $\mathrm{S}{\mathrm{O}}_4^{2-}$
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   Answer: B

5. Q652026 · 28 Jan 2026 · Shift 1
   
   1. A.C and E only
   2. B.A and E only
   3. C.A, B, D and E only
   4. D.A, C and E only
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   Answer: D