Mole Concept & Stoichiometry · JEE Advanced previous year questions

2023 3 questions

1. Q462023 · 4 Jun 2023 · Paper 1· Numerical answer
   
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   Answer: 8

2. Q482023 · 4 Jun 2023 · Paper 1

   Match the reactions (in the given stoichiometry of the reactants) in List-I with one of their products given in List-II and choose the correct option. $$\begin{array}{ll}\text{List-I}& \text{List-II}\\ \text{(P) }{\mathrm{P}}_2{\mathrm{O}}_3+3{\mathrm{H}}_2\mathrm{O}\to & \text{(1) }\mathrm{P}(\mathrm{O})(\mathrm{OC}{\mathrm{H}}_3)\mathrm{C}{\mathrm{l}}_2\\ \text{(Q) }{\mathrm{P}}_4+3NaOH+3{\mathrm{H}}_2\mathrm{O}\to & \text{(2) }{\mathrm{H}}_3\mathrm{P}{\mathrm{O}}_3\\ \text{(R) }\mathrm{PC}{\mathrm{l}}_5+\mathrm{C}{\mathrm{H}}_3\mathrm{COOH}\to & \text{(3) }\mathrm{P}{\mathrm{H}}_3\\ \text{(S) }{\mathrm{H}}_3\mathrm{P}{\mathrm{O}}_2+2{\mathrm{H}}_2\mathrm{O}+4AgN{\mathrm{O}}_3\to & \text{(4) }\mathrm{POC}{\mathrm{l}}_3\\ & \text{(5) }{\mathrm{H}}_3\mathrm{P}{\mathrm{O}}_4\end{array}$$

   1. A.$\mathrm{P}\to 2;\mathrm{Q}\to 3;\mathrm{R}\to 1;\mathrm{S}\to 5$
   2. B.$\mathrm{P}\to 3;\mathrm{Q}\to 5;\mathrm{R}\to 4;\mathrm{S}\to 2$
   3. C.$\mathrm{P}\to 5;\mathrm{Q}\to 2;\mathrm{R}\to 1;\mathrm{S}\to 3$
   4. D.$\mathrm{P}\to 2;\mathrm{Q}\to 3;\mathrm{R}\to 4;\mathrm{S}\to 5$
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   Answer: D

3. Q422023 · 4 Jun 2023 · Paper 2· Numerical answer

   ${\mathrm{H}}_2\mathrm{S}$ ($5$ moles) reacts completely with acidified aqueous potassium permanganate solution. In this reaction, the number of moles of water produced is $\mathbf{x}$, and the number of moles of electrons involved is $\mathbf{y}$. The value of $(\mathbf{x}+\mathbf{y})$ is _____.

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   Answer: 18