p-Block Elements · JEE Main previous year questions

2025 7 questions

1. Q592025 · 8 Apr 2025 · Shift 2

   On combustion $0.210\mathrm{g}$ of an organic compound containing C, H and O gave $0.127\mathrm{g}{\mathrm{H}}_2\mathrm{O}$ and $0.307\mathrm{g}\mathrm{C}{\mathrm{O}}_2$. The percentages of hydrogen and oxygen in the given organic compound respectively are:

   1. A.$7.55,43.85$
   2. B.$6.72,53.41$
   3. C.$6.72,39.87$
   4. D.$53.41,39.6$
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   Answer: B

2. Q642025 · 3 Apr 2025 · Shift 2

   Match the LIST-I with LIST-II \begin{tabular}{|l|l|l|l|} \hline \textbf{LIST-I} & & \textbf{LIST-II} & \\ \textbf{(Family)} & & \textbf{(Symbol of Element)} & \\ \hline A. & Pnictogen (group 15) & I & Ts \\ B & Chalcogen & II & Og \\ C & Halogen & III & Lv \\ D & Noble gas & IV & Mc \\ \hline \end{tabular} Choose the correct answer from the options given below:

   1. A.A-IV, B-I, C-II, D-III
   2. B.A-IV, B-III, C-I, D-II
   3. C.A-III, B-I, C-IV, D-II
   4. D.A-II, B-III, C-IV, D-I
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   Answer: B

3. Q732025 · 29 Jan 2025 · Shift 2· Numerical answer

   In the sulphur estimation, $0.20\mathrm{g}$ of a pure organic compound gave $0.40\mathrm{g}$ of barium sulphate. The percentage of sulphur in the compound is ____ $\times 10^{-1}\%$. $(\text{Molar mass : }\mathrm{O}=16,\mathrm{S}=32,\mathrm{Ba}=137\mathrm{in}\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1})$

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   Answer: 275

4. Q732025 · 24 Jan 2025 · Shift 2· Numerical answer

   In Carius method of estimation of halogen, $0.25\mathrm{g}$ of an organic compound gave $0.15\mathrm{g}$ of silver bromide ( $\mathrm{AgBr}$ ). The percentage of Bromine in the organic compound is ____ $\times 10^{-1}\%$ (Nearest integer). (Given : Molar mass of $\mathrm{Ag}$ is $108$ and $\mathrm{Br}$ is $80\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$ )

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   Answer: 255

5. Q732025 · 23 Jan 2025 · Shift 2· Numerical answer

   When $81.0\mathrm{g}$ of aluminium is allowed to react with $128.0\mathrm{g}$ of oxygen gas, the mass of aluminium oxide produced in grams is ____ . (Nearest integer) Given : Molar mass of $\mathrm{Al}$ is $27.0\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$ Molar mass of $\mathrm{O}$ is $16.0\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$

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   Answer: 153

6. Q722025 · 22 Jan 2025 · Shift 1· Numerical answer

   The number of molecules/ions that show linear geometry among the following is _________. ${\mathrm{SO}}_2,{\mathrm{BeCl}}_2,{\mathrm{CO}}_2,{\mathrm{N}}_3^{-},{\mathrm{NO}}_2,{\mathrm{F}}_2\mathrm{O},{\mathrm{XeF}}_2,{\mathrm{NO}}_2^{+},{\mathrm{I}}_3^{-},{\mathrm{O}}_3$

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   Answer: 6

7. Q742025 · 22 Jan 2025 · Shift 1· Numerical answer

   In Carius method for estimation of halogens, $180\text{ mg}$ of an organic compound produced $143.5\text{ mg}$ of $\mathrm{AgCl}$ . The percentage composition of chlorine in the compound is _________ %. (Given : molar mass in ${\text{g mol}}^{-1}$ of $\mathrm{Ag}:108,\mathrm{Cl}:35.5$ )

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   Answer: 20