Other Chemistry · JEE Main previous year questions

2012 28 questions

1. Q642012 · 26 May 2012 · Shift 1

   Among the following species which two have trigonal pyramidal shape? (I) $\mathrm{N}{\mathrm{I}}_3$ (II) ${\mathrm{I}}_3^{-}$ (III) $\mathrm{S}{\mathrm{O}}_3^{2-}$ (IV) $\mathrm{N}{\mathrm{O}}_3^{-}$

   1. A.I and III
   2. B.III and IV
   3. C.I and IV
   4. D.II and III
   Show answer

   Answer: A

2. Q682012 · 26 May 2012 · Shift 1

   The solubility of $\mathrm{Pb}{\mathrm{I}}_2$ at $25^{\circ }\mathrm{C}$ is $0.7\mathrm{g}{\mathrm{L}}^{-1}$. The solubility product of $\mathrm{Pb}{\mathrm{I}}_2$ at this temperature is (molar mass of $\mathrm{Pb}{\mathrm{I}}_2=461.2\mathrm{g}\mathrm{mo}{\mathrm{l}}^{-1}$)

   1. A.$1.40\times 10^{-9}$
   2. B.$0.14\times 10^{-9}$
   3. C.$140\times 10^{-9}$
   4. D.$14.0\times 10^{-9}$
   Show answer

   Answer: D

3. Q692012 · 26 May 2012 · Shift 1
   
   1. A.$\mathrm{IV}>\mathrm{III}>\mathrm{II}>\mathrm{I}$
   2. B.$\mathrm{III}>\mathrm{I}>\mathrm{II}>\mathrm{IV}$
   3. C.$\mathrm{II}>\mathrm{III}>\mathrm{I}>\mathrm{IV}$
   4. D.$\mathrm{I}>\mathrm{III}>\mathrm{II}>\mathrm{IV}$
   Show answer

   Answer: D

4. Q702012 · 26 May 2012 · Shift 1

   Maleic acid and fumaric acids are

   1. A.Chain isomers
   2. B.Functional isomers
   3. C.Tautomers
   4. D.Geometrical isomers
   Show answer

   Answer: D

5. Q762012 · 26 May 2012 · Shift 1

   The number of $\mathrm{S}-\mathrm{S}$ bonds in $\mathrm{S}{\mathrm{O}}_3,{\mathrm{S}}_2{\mathrm{O}}_3^{2-},{\mathrm{S}}_2{\mathrm{O}}_6^{2-}$ and ${\mathrm{S}}_2{\mathrm{O}}_8^{2-}$ respectively are

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

   Answer: C

6. Q782012 · 26 May 2012 · Shift 1

   The number of unpaired electrons in Gadolinium $[Z=64]$ is

   1. A.3
   2. B.8
   3. C.6
   4. D.2
   Show answer

   Answer: B

7. Q802012 · 26 May 2012 · Shift 1

   The hydration of propyne results in formation of

   1. A.Acetone
   2. B.Propanol-1
   3. C.Propene
   4. D.Propanal
   Show answer

   Answer: A

8. Q822012 · 26 May 2012 · Shift 1

   Which of the following statements is correct?

   1. A.RNA controls the synthesis of proteins.
   2. B.The sugar present in DNA is D-(-)-ribose.
   3. C.RNA has double stranded $\alpha$-helix structure.
   4. D.DNA mainly occurs in the cytoplasm of the cell.
   Show answer

   Answer: A

9. Q832012 · 26 May 2012 · Shift 1

   The relationship among most probable velocity, average velocity and root mean square velocity is respectively

   1. A.$\sqrt{2}:\sqrt{3}:\sqrt{8/\pi }$
   2. B.$\sqrt{2}:\sqrt{8/\pi }:\sqrt{3}$
   3. C.$\sqrt{8/\pi }:\sqrt{3}:\sqrt{2}$
   4. D.$\sqrt{3}:\sqrt{8/\pi }:\sqrt{2}$
   Show answer

   Answer: B

10. Q842012 · 26 May 2012 · Shift 1

    Fire extinguishers contain ${\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4$ and which one of the following?

    1. A.$\mathrm{NaHC}{\mathrm{O}}_3$ and $\mathrm{N}{\mathrm{a}}_2\mathrm{C}{\mathrm{O}}_3$
    2. B.$\mathrm{N}{\mathrm{a}}_2\mathrm{C}{\mathrm{O}}_3$
    3. C.$\mathrm{NaHC}{\mathrm{O}}_3$
    4. D.$\mathrm{CaC}{\mathrm{O}}_3$
    Show answer

    Answer: A

11. Q862012 · 26 May 2012 · Shift 1

    Among the following the incorrect statement is

    1. A.Density of crystals remains unaffected due to Frenkel defect.
    2. B.In BCC unit cell the void space is 32%.
    3. C.Density of crystals decreases due to Schottky defect.
    4. D.Electrical conductivity of semiconductors and metals increases with increase in temperature.
    Show answer

    Answer: D

12. Q612012 · 12 May 2012 · Shift 1

    An aqueous solution of oxalic acid dihydrate contains its $6.3\mathrm{g}$ in $250\mathrm{mL}$. The volume of $0.1\mathrm{N}\mathrm{NaOH}$ required to completely neutralize $10\mathrm{mL}$ of this solution

    1. A.$4\mathrm{mL}$
    2. B.$20\mathrm{mL}$
    3. C.$2\mathrm{mL}$
    4. D.$40\mathrm{mL}$
    Show answer

    Answer: D

13. Q732012 · 12 May 2012 · Shift 1

    The reaction, $\mathrm{C}{\mathrm{H}}_3\mathrm{CHO}\underset{\mathrm{Zn}(\mathrm{Hg})/Conc.\mathrm{HCl}}{\overset{[\mathrm{H}]}{\to }}\mathrm{C}{\mathrm{H}}_3\mathrm{C}{\mathrm{H}}_3$

    1. A.Cannizzaro's reaction
    2. B.Rosenmund reduction
    3. C.Wolff-Kishner reduction
    4. D.Clemmensen reduction
    Show answer

    Answer: D

14. Q792012 · 12 May 2012 · Shift 1

    Which of the following statements is wrong?

    1. A.Ethyl chloride on reduction with $\mathrm{Zn}-\mathrm{Cu}$ couple and alcohol gives ethane.
    2. B.The reaction of methyl magnesium bromide with acetone gives butanol-2.
    3. C.Alkyl halides follow the following reactivity sequence on reaction with alkenes. $\mathrm{R}-\mathrm{I}>\mathrm{R}-\mathrm{Br}>\mathrm{R}-\mathrm{Cl}>\mathrm{R}-\mathrm{F}$
    4. D.${\mathrm{C}}_2{\mathrm{H}}_4\mathrm{C}{\mathrm{l}}_2$ may exist in two isomeric forms
    Show answer

    Answer: B

15. Q802012 · 12 May 2012 · Shift 1
    
    1. A.
    2. B.
    3. C.
    4. D.
    Show answer

    Answer: C

16. Q832012 · 12 May 2012 · Shift 1

    $\alpha ,v$ and $u$ represent most probable velocity, average velocity and root mean square velocity respectively of a gas at a particular temperature. The correct order among the following is

    1. A.$u>v>\alpha$
    2. B.$v>u>\alpha$
    3. C.$\alpha >u>v$
    4. D.$u>\alpha >v$
    Show answer

    Answer: A

17. Q872012 · 12 May 2012 · Shift 1

    The correct statement for both the processes of physisorption and chemisorption is

    1. A.both are endothermic
    2. B.chemisorption is endothermic but physisorption is exothermic
    3. C.both are exothermic
    4. D.physisorption is endothermic but chemisorption is exothermic.
    Show answer

    Answer: C

18. Q902012 · 12 May 2012 · Shift 1

    Chemically heroin is

    1. A.morphine monoacetate
    2. B.morphine dibenzoate
    3. C.morphine diacetate
    4. D.morphine monobenzoate
    Show answer

    Answer: C

19. Q642012 · 7 May 2012 · Shift 1

    Among the following, the species having the smallest bond is

    1. A.$\mathrm{N}{\mathrm{O}}^{-}$
    2. B.$\mathrm{N}{\mathrm{O}}^{+}$
    3. C.${\mathrm{O}}_2$
    4. D.$\mathrm{NO}$
    Show answer

    Answer: B

20. Q712012 · 7 May 2012 · Shift 1

    Among the following the order of reactivity towards nucleophilic addition is

    1. A.$\mathrm{C}{\mathrm{H}}_3\mathrm{CHO}>\mathrm{C}{\mathrm{H}}_3\mathrm{COC}{\mathrm{H}}_3>\mathrm{HCHO}$
    2. B.$\mathrm{HCHO}>\mathrm{C}{\mathrm{H}}_3\mathrm{CHO}>\mathrm{C}{\mathrm{H}}_3\mathrm{COC}{\mathrm{H}}_3$
    3. C.$\mathrm{C}{\mathrm{H}}_3\mathrm{CHO}>\mathrm{HCHO}>\mathrm{C}{\mathrm{H}}_3\mathrm{COC}{\mathrm{H}}_3$
    4. D.$\mathrm{C}{\mathrm{H}}_3\mathrm{COC}{\mathrm{H}}_3>\mathrm{C}{\mathrm{H}}_3\mathrm{CHO}>\mathrm{HCHO}$
    Show answer

    Answer: B

21. Q742012 · 7 May 2012 · Shift 1

    Reaction rate between two substance $A$ and $B$ is expressed as following: $\mathrm{rate}=k[A{]}^n[B{]}^m$ If the concentration of $A$ is doubled and concentration of $B$ is made half of initial concentration, the ratio of the new rate to the earlier rate will be:

    1. A.$m+n$
    2. B.$n-m$
    3. C.$\frac{1}{2^{(m+n)}}$
    4. D.$2^{(n-m)}$
    Show answer

    Answer: D

22. Q762012 · 7 May 2012 · Shift 1

    Which is not the correct Statement? (At. nos. $\mathrm{Ce}=58$, $\mathrm{Lu}=71$, $\mathrm{La}=57$, $\mathrm{Yb}=70$)

    1. A.Colour of $\mathrm{Y}{\mathrm{b}}^{3+}$ ion is pink.
    2. B.$\mathrm{L}{\mathrm{a}}^{3+}$ is diamagnetic.
    3. C.$\mathrm{C}{\mathrm{e}}^{4+}$ has $f^0$ configuration.
    4. D.$\mathrm{L}{\mathrm{u}}^{3+}$ has $f^{14}$ configuration.
    Show answer

    Answer: A

23. Q772012 · 7 May 2012 · Shift 1

    How many cyclic structures are possible for ${\mathrm{C}}_4{\mathrm{H}}_6$?

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

    Answer: B

24. Q782012 · 7 May 2012 · Shift 1

    The most basic compound among the following is

    1. A.Acetanilide
    2. B.Benzylamine
    3. C.$p$-Nitro aniline
    4. D.Aniline
    Show answer

    Answer: B

25. Q792012 · 7 May 2012 · Shift 1

    ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Br}\stackrel{\mathrm{AgCN}}{\to }\mathrm{X}\underset{\mathrm{Zn}-Hg/HCl}{\overset{\mathrm{Reduction}}{\to }}\mathrm{Y}$, Here Y is

    1. A.Ethyl methyl amine
    2. B.$n$-propylamine
    3. C.Isopropylamine
    4. D.Ethylamine
    Show answer

    Answer: A