Other Chemistry · JEE Main previous year questions

2024 85 questions

1. Q782024 · 27 Jan 2024 · Shift 1

   $\text{NaCl}$ reacts with conc. ${\text{H}}_2{\text{SO}}_4$ and ${\text{K}}_2{\text{Cr}}_2{\text{O}}_7$ to give reddish fumes (B), which react with $\text{NaOH}$ to give yellow solution (C). (B) and (C) respectively are ;

   1. A.${\text{CrO}}_2{\text{Cl}}_2,{\text{Na}}_2{\text{CrO}}_4$
   2. B.${\text{Na}}_2{\text{CrO}}_4,{\text{CrO}}_2{\text{Cl}}_2$
   3. C.${\text{CrO}}_2{\text{Cl}}_2,{\text{KHSO}}_4$
   4. D.${\text{CrO}}_2{\text{Cl}}_2,{\text{Na}}_2{\text{Cr}}_2{\text{O}}_7$
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   Answer: A

2. Q812024 · 27 Jan 2024 · Shift 1· Numerical answer

   The mass of silver (Molar mass of $\text{Ag}:108{\text{ gmol}}^{-1}$) displaced by a quantity of electricity which displaces $5600\text{ mL}$ of ${\text{O}}_2$ at S.T.P. will be _____ $\text{g}$.

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   Answer: 108

3. Q832024 · 27 Jan 2024 · Shift 1· Numerical answer

   Mass of methane required to produce $22\text{ g}$ of ${\text{CO}}_2$ after complete combustion is _______ $\text{g}$. (Given Molar mass in $\text{g mol-1 C}=12.0$, $\text{H}=1.0$, $\text{O}=16.0$)

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   Answer: 8

4. Q872024 · 27 Jan 2024 · Shift 1· Numerical answer

   Among the following, total number of meta directing functional groups is (Integer based) $-{\text{OCH}}_3,-{\text{NO}}_2,-\text{CN},-{\text{CH}}_3,-{\text{NHCOCH}}_3,-\text{COR},-\text{OH},-\text{COOH},-\text{Cl}$

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   Answer: 4

5. Q612024 · 27 Jan 2024 · Shift 2

   Identify the incorrect pair from the following :

   1. A.Haber process - $\text{Iron}$
   2. B.Polythene preparation - ${\text{TiCl}}_4,{\text{Al(CH}}_3{)}_3$
   3. C.Photography - $\text{AgBr}$
   4. D.Wacker process - ${\text{PtCl}}_2$
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   Answer: D

6. Q672024 · 27 Jan 2024 · Shift 2
   
   1. A.
   2. B.
   3. C.
   4. D.
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   Answer: A

7. Q712024 · 27 Jan 2024 · Shift 2
   
   1. A.(B) and (C) only
   2. B.(A), (B) and (D) only
   3. C.(B) only
   4. D.(A) and (B) only
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   Answer: C

8. Q782024 · 27 Jan 2024 · Shift 2
   
   1. A.
   2. B.
   3. C.
   4. D.
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   Answer: D

9. Q792024 · 27 Jan 2024 · Shift 2

   The quantity which changes with temperature is :

   1. A.Molality
   2. B.Molarity
   3. C.Mole fraction
   4. D.Mass percentage
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   Answer: B

10. Q882024 · 27 Jan 2024 · Shift 2· Numerical answer

    Volume of $3\text{M NaOH}$ (formula weight $40{\text{ g mol}}^{-1}$ ) which can be prepared from $84\text{ g}$ of $\text{NaOH}$ is _______ $\times 10^{-1}{\text{dm}}^3$.

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    Answer: 7