Metallurgy · JEE Main previous year questions

2025 3 questions

1. Q622025 · 4 Apr 2025 · Shift 2
   
   1. A.(A) & (B) only
   2. B.(B) & (D) only
   3. C.(A) & (C) only
   4. D.(B) & (C) only
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   Answer: A

2. Q652025 · 29 Jan 2025 · Shift 2

   If $\mathrm{C}(\mathrm{diamond})\to \mathrm{C}(\mathrm{graphite})+X\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$ $\mathrm{C}(\mathrm{diamond})+{\mathrm{O}}_2(\mathrm{g})\to \mathrm{C}{\mathrm{O}}_2(\mathrm{g})+Y\mathrm{kJmo}{\mathrm{l}}^{-1}$ $\mathrm{C}(\mathrm{graphite})+{\mathrm{O}}_2(\mathrm{g})\to \mathrm{C}{\mathrm{O}}_2(\mathrm{g})+Z\mathrm{kJmo}{\mathrm{l}}^{-1}$ at constant temperature. Then

   1. A.$-X=Y+Z$
   2. B.$X=Y-Z$
   3. C.$X=-Y+Z$
   4. D.$X=Y+Z$
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   Answer: B

3. Q552025 · 24 Jan 2025 · Shift 1

   Given below are two statements: Statement I: The conversion proceeds well in the less polar medium. $$\mathrm{C}{\mathrm{H}}_3-\mathrm{C}{\mathrm{H}}_2-\mathrm{C}{\mathrm{H}}_2-\mathrm{C}{\mathrm{H}}_2-\mathrm{Cl}\stackrel{\mathrm{H}{\mathrm{O}}^{-}}{\to }\mathrm{C}{\mathrm{H}}_3-\mathrm{C}{\mathrm{H}}_2-\mathrm{C}{\mathrm{H}}_2-\mathrm{C}{\mathrm{H}}_2-\mathrm{OH}+\mathrm{C}{\mathrm{l}}^{(-)}$$ Statement II: The conversion proceeds well in the more polar medium. $$\mathrm{C}{\mathrm{H}}_3-\mathrm{C}{\mathrm{H}}_2-\mathrm{C}{\mathrm{H}}_2-\mathrm{C}{\mathrm{H}}_2-\mathrm{Cl}\stackrel{{\mathrm{R}}_3\ddot{\mathrm{N}}}{\to }\mathrm{C}{\mathrm{H}}_3-\mathrm{C}{\mathrm{H}}_2-\mathrm{C}{\mathrm{H}}_2-\mathrm{C}{\mathrm{H}}_2-\underset{\underset{\mathrm{R}}{|}}{\stackrel{\stackrel{\mathrm{R}}{|}}{\underset{(+)}{\mathrm{N}}}}-\mathrm{R}\mathrm{C}{\mathrm{l}}^{(-)}$$ In the light of the above statements, choose the correct answer from the options given below

   1. A.Statement I is false but Statement II is true
   2. B.Statement I is true but Statement II is false
   3. C.Both Statement I and Statement II are false
   4. D.Both Statement I and Statement II are true
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   Answer: D