Other Chemistry · JEE Main previous year questions

2017 14 questions

1. Q642017 · 9 Apr 2017 · Shift 1

   What quantity (in mL) of a 45% acid solution of a mono-protic strong acid must be mixed with a 20% solution of the same acid to produce 800 mL of a 29.875% acid solution ?

   1. A.320
   2. B.325
   3. C.316
   4. D.330
   Show answer

   Answer: C

2. Q652017 · 9 Apr 2017 · Shift 1

   To find the standard potential of ${\mathrm{M}}^{3+}/M$ electrode, the following cell is constituted : $Pt/M/{\mathrm{M}}^{3+}(0.001\mathrm{mol}{\mathrm{L}}^{-1})/\mathrm{A}{\mathrm{g}}^{+}(0.01\mathrm{mol}{\mathrm{L}}^{-1})/\mathrm{Ag}$ The emf of the cell is found to be 0.421 volt at 298 K. The standard potential of half reaction ${\mathrm{M}}^{3+}+3{\mathrm{e}}^{-}\to \mathrm{M}$ at 298 K will be : (Given $E_{\mathrm{A}{\mathrm{g}}^{+}/Ag}^o$ at 298 K = 0.80 Volt)

   1. A.$0.38\mathrm{Volt}$
   2. B.$0.32\mathrm{Volt}$
   3. C.$1.28\mathrm{Volt}$
   4. D.$0.66\mathrm{Volt}$
   Show answer

   Answer: B

3. Q712017 · 9 Apr 2017 · Shift 1

   Which one of the following is an oxide?

   1. A.$\mathrm{K}{\mathrm{O}}_2$
   2. B.$\mathrm{Ba}{\mathrm{O}}_2$
   3. C.$\mathrm{Si}{\mathrm{O}}_2$
   4. D.$\mathrm{Cs}{\mathrm{O}}_2$
   Show answer

   Answer: C

4. Q722017 · 9 Apr 2017 · Shift 1

   The group having triangular planar structures is :

   1. A.$\mathrm{B}{\mathrm{F}}_3$, $\mathrm{N}{\mathrm{F}}_3$, $C{O}_3^{2-}$
   2. B.$C{O}_3^{2-}$, $N{O}_3^{-}$, $\mathrm{S}{\mathrm{O}}_3$
   3. C.$\mathrm{N}{\mathrm{H}}_3$, $\mathrm{S}{\mathrm{O}}_3$, $C{O}_3^{2-}$
   4. D.$\mathrm{NC}{\mathrm{l}}_3$, $\mathrm{BC}{\mathrm{l}}_3$, $\mathrm{S}{\mathrm{O}}_3$
   Show answer

   Answer: B

5. Q732017 · 9 Apr 2017 · Shift 1

   Which of the following ions does not liberate hydrogen gas on reaction with dilute acids ?

   1. A.$\mathrm{T}{\mathrm{i}}^{2+}$
   2. B.${\mathrm{V}}^{2+}$
   3. C.$\mathrm{C}{\mathrm{r}}^{2+}$
   4. D.$\mathrm{M}{\mathrm{n}}^{2+}$
   Show answer

   Answer: D

6. Q742017 · 9 Apr 2017 · Shift 1

   $[\mathrm{C}{\mathrm{o}}_2(\mathrm{CO}{)}_8]$ displays :

   1. A.one Co–Co bond, six terminal CO and two bridging CO
   2. B.one Co–Co bond, four terminal CO and four bridging CO
   3. C.no Co–Co bond, six terminal CO and two bridging CO
   4. D.no Co–Co bond, four terminal CO and four bridging CO
   Show answer

   Answer: A

7. Q752017 · 9 Apr 2017 · Shift 1

   The incorrect statement among the following is :

   1. A.$\alpha$-D-glucose and $\beta$-D-glucose are anomers.
   2. B.$\alpha$-D-glucose and $\beta$-D-glucose are enantiomers.
   3. C.Cellulose is a straight chain polysaccharide made up of only $\beta$-D-glucose units.
   4. D.The penta acetate of glucose does not react with hydroxyl amine
   Show answer

   Answer: B

8. Q892017 · 9 Apr 2017 · Shift 1

   The correct sequence of decreasing number of $\pi$-bonds in the structures of ${\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_3$, ${\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4$ and ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7$ is :

   1. A.${\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_3>{\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4>{\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7$
   2. B.${\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4>{\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7>{\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_3$
   3. C.${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7>{\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4>{\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_3$
   4. D.${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7>{\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_3>{\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4$
   Show answer

   Answer: C

9. Q622017 · 8 Apr 2017 · Shift 1

   For a reaction, $\mathrm{A}(\mathrm{g})\to \mathrm{A}(\mathrm{\ell })$; $\Delta \mathrm{H}=-3\mathrm{RT}$. The correct statement for the reaction is :

   1. A.$\Delta \mathrm{H}=\Delta \mathrm{U}\ne 0$
   2. B.$\Delta \mathrm{H}=\Delta \mathrm{U}=0$
   3. C.$|\Delta \mathrm{H}|<|\Delta \mathrm{U}|$
   4. D.$|\Delta \mathrm{H}|>|\Delta \mathrm{U}|$
   Show answer

   Answer: D

10. Q642017 · 8 Apr 2017 · Shift 1

    If the shortest wavelength in Lyman series of hydrogen atom is A, then the longest wavelength in Paschen series of $\mathrm{H}{\mathrm{e}}^{+}$ is :

    1. A.$\frac{5A}{9}$
    2. B.$\frac{9A}{5}$
    3. C.$\frac{36A}{5}$
    4. D.$\frac{36A}{7}$
    Show answer

    Answer: D

11. Q782017 · 8 Apr 2017 · Shift 1
    
    1. A.(I)
    2. B.(II)
    3. C.(III)
    4. D.(IV)
    Show answer

    Answer: B

12. Q852017 · 8 Apr 2017 · Shift 1

    Among the following, correct statement is :

    1. A.Brownian movement is more pronounced for smaller particles than for bigger particles
    2. B.Sols of metal sulphides are lyophilic.
    3. C.Hardy Schulze law states that bigger the size of the ions, the greater is its coagulating power.
    4. D.One would expect charcoal to adsorb chlorine more than hydrogen sulphide.
    Show answer

    Answer: A, D

13. Q862017 · 8 Apr 2017 · Shift 1

    Among the following, the incorrect statement is :

    1. A.At low pressure, real gases show ideal behaviour.
    2. B.At very low temperature, real gases show ideal behaviour.
    3. C.At very large volume, real gases show ideal behaviour.
    4. D.At Boyle’s temperature, real gases show ideal behaviour.
    Show answer

    Answer: B

14. Q892017 · 8 Apr 2017 · Shift 1

    The number of S = O and S − OH bonds present in peroxodisulphuric acid and pyrosulphuric acid respectively are :

    1. A.(2 and 2) and (2 and 2)
    2. B.(2 and 4) and (2 and 4)
    3. C.(4 and 2) and (2 and 4)
    4. D.(4 and 2) and (4 and 2)
    Show answer

    Answer: D