Other Chemistry · JEE Main previous year questions

2024 85 questions

1. Q622024 · 5 Apr 2024 · Shift 2

   Match List I with List II. $$\begin{array}{llll}& \text{LIST I}& & \text{LIST II}\\ \text{A.}& \mathrm{ICl}& \text{I.}& \text{T - shape}\\ \text{B.}& \mathrm{IC}{\mathrm{l}}_3& \text{II.}& \text{Square pyramidal}\\ \text{C.}& \mathrm{Cl}{\mathrm{F}}_5& \text{III.}& \text{Pentagonal bipyramidal}\\ \text{D.}& \mathrm{I}{\mathrm{F}}_7& \text{IV.}& \text{Linear}\end{array}$$ Choose the correct answer from the options given below :

   1. A.(A)-(I), (B)-(IV), (C)-(III), (D)-(II)
   2. B.(A)-(IV), (B)-(I), (C)-(II), (D)-(III)
   3. C.(A)-(I), (B)-(III), (C)-(II), (D)-(IV)
   4. D.(A)-(IV), (B)-(III), (C)-(II), (D)-(I)
   Show answer

   Answer: B

2. Q632024 · 5 Apr 2024 · Shift 2
   
   1. A.2-carboxy-4-hydroxyhept-7-enal
   2. B.2-formyl-4-hydroxyhept-7-enoic acid
   3. C.2-carboxy-4-hydroxyhept-6-enal
   4. D.2-formyl-4-hydroxyhept-6-enoic acid
   Show answer

   Answer: D

3. Q702024 · 5 Apr 2024 · Shift 2
   
   1. A.picric acid
   2. B.oxalic acid
   3. C.adipic acid
   4. D.acetic acid
   Show answer

   Answer: C

4. Q752024 · 5 Apr 2024 · Shift 2

   The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is ____. ${\mathrm{Ti}}^{2+}$, ${\mathrm{Cr}}^{2+}$ and ${\mathrm{V}}^{2+}$

   1. A.1
   2. B.2
   3. C.3
   4. D.0
   Show answer

   Answer: C

5. Q772024 · 5 Apr 2024 · Shift 2

   The quantity of silver deposited when one coulomb charge is passed through $\mathrm{AgN}{\mathrm{O}}_3$ solution :

   1. A.$0.1\mathrm{g}$ atom of silver
   2. B.1 chemical equivalent of silver
   3. C.$1\mathrm{g}$ of silver
   4. D.1 electrochemical equivalent of silver
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   Answer: D

6. Q642024 · 4 Apr 2024 · Shift 1
   
   1. A.(A) - (I), (B) - (II), (C) - (IV), (D) - (III)
   2. B.(A) - (II), (B) - (IV), (C) - (III), (D) - (I)
   3. C.(A) - (III), (B) - (I), (C) - (II), (D) - (IV)
   4. D.(A) - (IV), (B) - (III), (C) - (I), (D) - (II)
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   Answer: D

7. Q742024 · 4 Apr 2024 · Shift 1

   Which among the following is incorrect statement?

   1. A.The electromeric effect is a temporary effect
   2. B.Hydrogen ion $\left({\mathrm{H}}^{+}\right)$ shows negative electromeric effect
   3. C.The organic compound shows electromeric effect in the presence of the reagent only.
   4. D.Electromeric effect dominates over inductive effect
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   Answer: B

8. Q752024 · 4 Apr 2024 · Shift 1

   One of the commonly used electrode is calomel electrode. Under which of the following categories, calomel electrode comes?

   1. A.Metal ion - Metal electrodes
   2. B.Oxidation - Reduction electrodes
   3. C.Metal - Insoluble Salt - Anion electrodes
   4. D.Gas - Ion electrodes
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   Answer: C

9. Q792024 · 4 Apr 2024 · Shift 1

   What pressure (bar) of ${\mathrm{H}}_2$ would be required to make emf of hydrogen electrode zero in pure water at $25^{\circ }\mathrm{C}$ ?

   1. A.0.5
   2. B.$10^{-14}$
   3. C.1
   4. D.$10^{-7}$
   Show answer

   Answer: B

10. Q802024 · 4 Apr 2024 · Shift 1

    Number of elements from the following that CANNOT form compounds with valencies which match with their respective group valencies is ________. B, C, N, S, O, F, P, Al, Si

    1. A.7
    2. B.3
    3. C.5
    4. D.6
    Show answer

    Answer: B

11. Q892024 · 4 Apr 2024 · Shift 1· Numerical answer

    Number of molecules/species from the following having one unpaired electron is ____. ${\mathrm{O}}_2,{\mathrm{O}}_2^{-1},\mathrm{NO},\mathrm{C}{\mathrm{N}}^{-1},{\mathrm{O}}_2^{2-}$

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    Answer: 2

12. Q702024 · 4 Apr 2024 · Shift 2

    When ${\text{MnO}}_2$ and ${\text{H}}_2{\text{SO}}_4$ are added to a salt (A), a greenish yellow gas is liberated. The salt (A) is :

    1. A.${\text{NH}}_4\text{Cl}$
    2. B.${\text{CaI}}_2$
    3. C.${\text{KNO}}_3$
    4. D.$\text{NaBr}$
    Show answer

    Answer: A

13. Q722024 · 4 Apr 2024 · Shift 2

    Choose the Incorrect Statement about Dalton's Atomic Theory

    1. A.Compounds are formed when atoms of different elements combine in any ratio.
    2. B.Matter consists of indivisible atoms.
    3. C.chemical reactions involve reorganization of atoms
    4. D.All the atoms of a given element have identical properties including identical mass.
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    Answer: A

14. Q742024 · 4 Apr 2024 · Shift 2

    The number of species from the following that have pyramidal geometry around the central atom is _________ ${\text{S}}_2{\text{O}}_3^{2-},{\text{SO}}_4^{2-},{\text{SO}}_3^{2-},{\text{S}}_2{\text{O}}_7^{2-}$

    1. A.4
    2. B.3
    3. C.2
    4. D.1
    Show answer

    Answer: D

15. Q812024 · 1 Feb 2024 · Shift 1· Numerical answer

    The number of white coloured salts, among the following is (a) $\mathrm{SrS}{\mathrm{O}}_4$ (b) $\mathrm{Mg}(\mathrm{N}{\mathrm{H}}_4)\mathrm{P}{\mathrm{O}}_4$ (c) $\mathrm{BaCr}{\mathrm{O}}_4$ (d) $\mathrm{Mn}(\mathrm{OH}{)}_2$ (e) $\mathrm{PbS}{\mathrm{O}}_4$ (f) $\mathrm{PbCr}{\mathrm{O}}_4$ (g) $\mathrm{AgBr}$ (h) $\mathrm{Pb}{\mathrm{I}}_2$ (i) $\mathrm{Ca}{\mathrm{C}}_2{\mathrm{O}}_4$ (j) $[\mathrm{Fe}(\mathrm{OH}{)}_2(\mathrm{C}{\mathrm{H}}_3\mathrm{COO})]$

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    Answer: 5

16. Q832024 · 1 Feb 2024 · Shift 1· Numerical answer

    The potential for the given half cell at $298\text{ K}$ is $(-)$ ________ $\times 10^{-2}\text{ V}$ (Nearest integer) $$2{\mathrm{H}}_{(\mathrm{aq})}^{+}+2{\mathrm{e}}^{-}⟶{\mathrm{H}}_2(\mathrm{g})$$ $[{\mathrm{H}}^{+}]=1\text{ M}$, ${\mathrm{P}}_{{\mathrm{H}}_2}=2\text{ atm}$ (Given : $2.303RT/F=0.06\text{ V}$, $\log 2=0.3$)

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    Answer: 1

17. Q842024 · 1 Feb 2024 · Shift 1· Numerical answer

    Among the following oxides of p-block elements, number of oxides having amphoteric nature is ________ . $\mathrm{C}{\mathrm{l}}_2{\mathrm{O}}_7$, $\mathrm{CO}$, $\mathrm{Pb}{\mathrm{O}}_2$, ${\mathrm{N}}_2\mathrm{O}$, $\mathrm{NO}$, $\mathrm{A}{\mathrm{l}}_2{\mathrm{O}}_3$, $\mathrm{Si}{\mathrm{O}}_2$, ${\mathrm{N}}_2{\mathrm{O}}_5$, $\mathrm{Sn}{\mathrm{O}}_2$

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    Answer: 3

18. Q862024 · 1 Feb 2024 · Shift 1· Numerical answer

    The number of molecules/ion/s having trigonal bipyramidal shape is ________ . $\mathrm{P}{\mathrm{F}}_5$, $\mathrm{Br}{\mathrm{F}}_5$, $\mathrm{PC}{\mathrm{l}}_5$, $[\mathrm{PtC}{\mathrm{l}}_4{]}^{2-}$, $\mathrm{B}{\mathrm{F}}_3$, $\mathrm{Fe}(\mathrm{CO}{)}_5$

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    Answer: 3

19. Q612024 · 1 Feb 2024 · Shift 2
    
    1. A.$A:\text{n-Pentane}B:\text{Cis-2-butene}$
    2. B.$A:\text{2-Pentyne}B:\text{Cis-2-butene}$
    3. C.$A:\text{n-Pentane}B:\text{trans-2-butene}$
    4. D.$A:\text{2-Pentyne}B:\text{trans-2-butene}$
    Show answer

    Answer: D

20. Q642024 · 1 Feb 2024 · Shift 2

    The set of meta directing functional groups from the following sets is :

    1. A.$-\mathrm{CN},-\mathrm{N}{\mathrm{H}}_2,-\mathrm{NHR},-\mathrm{OC}{\mathrm{H}}_3$
    2. B.$-\mathrm{CN},-\mathrm{CHO},-\mathrm{NHCOC}{\mathrm{H}}_3,-\mathrm{COOR}$
    3. C.$-\mathrm{N}{\mathrm{O}}_2,-\mathrm{N}{\mathrm{H}}_2,-\mathrm{COOH},-\mathrm{COOR}$
    4. D.$-\mathrm{N}{\mathrm{O}}_2,-\mathrm{CHO},-\mathrm{S}{\mathrm{O}}_3\mathrm{H},-\mathrm{COR}$
    Show answer

    Answer: D

21. Q772024 · 1 Feb 2024 · Shift 2

    Given below are two statements : Statement (I) : A $\pi$ bonding MO has lower electron density above and below the inter-nuclear axis. Statement (II) : The ${\pi }^{\ast }$ antibonding MO has a node between the nuclei. In the light of the above statements, choose the most appropriate answer from the options given below :

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

    Answer: D

22. Q862024 · 1 Feb 2024 · Shift 2· Numerical answer

    The amount of electricity in Coulomb required for the oxidation of $1\text{ mol}$ of ${\mathrm{H}}_2\mathrm{O}$ to ${\mathrm{O}}_2$ is ________ $\times 10^5\text{ C}$.

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    Answer: 2

23. Q632024 · 31 Jan 2024 · Shift 1

    The compound that is white in color is

    1. A.ammonium sulphide
    2. B.ammonium arsinomolybdate
    3. C.lead iodide
    4. D.lead sulphate
    Show answer

    Answer: D

24. Q692024 · 31 Jan 2024 · Shift 1

    The product (C) in the below mentioned reaction is : $$\mathrm{C}{\mathrm{H}}_3-\mathrm{C}{\mathrm{H}}_2-\mathrm{C}{\mathrm{H}}_2-\mathrm{Br}\underset{\Delta }{\overset{\mathrm{KO}{\mathrm{H}}_{(\mathrm{alc})}}{\to }}\mathrm{A}\stackrel{\mathrm{HBr}}{\to }\mathrm{B}\underset{\mathrm{KO}{\mathrm{H}}_{(\mathrm{aq})}}{\overset{\Delta }{\to }}\mathrm{C}$$

    1. A.Propan-1-ol
    2. B.Propyne
    3. C.Propan-2-ol
    4. D.Propene
    Show answer

    Answer: C

25. Q882024 · 31 Jan 2024 · Shift 1· Numerical answer

    Molar mass of the salt from $\mathrm{NaBr},\mathrm{NaN}{\mathrm{O}}_3,\mathrm{KI}$ and $\mathrm{Ca}{\mathrm{F}}_2$ which does not evolve coloured vapours on heating with concentrated ${\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4$ is ____ $\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$. (Molar mass in $\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$ : $\mathrm{Na}:23,\mathrm{N}:14,\mathrm{K}:39,\mathrm{O}:16,\mathrm{Br}:80,\mathrm{I}:127,\mathrm{F}:19,\mathrm{Ca}:40$)

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    Answer: 78