d- and f-Block Elements · JEE Main previous year questions

2026 4 questions

1. Q512026 · 5 Apr 2026 · Shift 2

   What volume of hydrogen gas at STP would be liberated by action of $50\mathrm{mL}$ of ${\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4$ of $50\%$ purity ($\text{density}=1.3\mathrm{g}\mathrm{m}{\mathrm{L}}^{-1}$) on $20\mathrm{g}$ of zinc ? Given : Molar mass of $\mathrm{H}$, $\mathrm{O}$, $\mathrm{S}$, $\mathrm{Zn}$ are $1$, $16$, $32$, $65\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$ respectively.

   1. A.$5.824\mathrm{L}$
   2. B.$7.428\mathrm{L}$
   3. C.$6.892\mathrm{L}$
   4. D.$8.375\mathrm{L}$
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   Answer: C

2. Q602026 · 4 Apr 2026 · Shift 1

   The correct statements among the following are, A. $\mathrm{Mo}(\mathrm{VI})$ and $\mathrm{W}(\mathrm{VI})$ are less stable than $\mathrm{Cr}(\mathrm{VI})$. B. $\mathrm{C}{\mathrm{e}}^{4+}$ and $\mathrm{T}{\mathrm{b}}^{4+}$ are oxidant while $\mathrm{E}{\mathrm{u}}^{2+}$ and $\mathrm{Y}{\mathrm{b}}^{2+}$ are reductant. C. $\mathrm{Cm}$ and $\mathrm{Am}$ have seven unpaired electrons. D. Actinoid contraction is greater from element to element than lanthanoid contraction. Choose the correct answer from the options given below:

   1. A.A and B Only
   2. B.C and D Only
   3. C.B and D Only
   4. D.A and C Only
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   Answer: C

3. Q512026 · 2 Apr 2026 · Shift 1

   The mass of iron converted into $\mathrm{F}{\mathrm{e}}_3{\mathrm{O}}_4$ by the action of $18\mathrm{g}$ of steam is : (Given : Molar mass of H, O and Fe are 1, 16 and $56\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$ respectively) Assume iron is present in excess :

   1. A.$2.1\mathrm{g}$
   2. B.$4.2\mathrm{g}$
   3. C.$21\mathrm{g}$
   4. D.$42\mathrm{g}$
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   Answer: D

4. Q632026 · 21 Jan 2026 · Shift 1
   
   1. A.
   2. B.
   3. C.
   4. D.
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   Answer: A