Other Chemistry · JEE Main previous year questions

2009 5 questions

1. Q612009 · 27 Apr 2009 · Shift 1

   Calculate the wavelength (in nanometer) associated with a proton moving at $1.0\times 10^3\mathrm{m}{\mathrm{s}}^{-1}$ (Mass of $\mathrm{proton}=1.67\times 10^{-27}\mathrm{kg}$ and $\mathrm{h}=6.63\times 10^{-34}\mathrm{Js}$) :

   1. A.$0.40\mathrm{nm}$
   2. B.$2.5\mathrm{nm}$
   3. C.$14.0\mathrm{nm}$
   4. D.$0.032\mathrm{nm}$
   Show answer

   Answer: A

2. Q622009 · 27 Apr 2009 · Shift 1

   In an atom, an electron is moving with a speed of $600m/s$ with an accuracy of $0.005\%$. Certainity with which the position of the electron can be located is ($\mathrm{h}=6.6\times 10^{-34}\mathrm{kg}{\mathrm{m}}^2{\mathrm{s}}^{-1}$, mass of electron, $e_m=9.1\times 10^{-31}\mathrm{kg}$)

   1. A.$5.10\times 10^{-3}\mathrm{m}$
   2. B.$1.92\times 10^{-3}\mathrm{m}$
   3. C.$3.84\times 10^{-3}\mathrm{m}$
   4. D.$1.52\times 10^{-4}\mathrm{m}$
   Show answer

   Answer: B

3. Q632009 · 27 Apr 2009 · Shift 1

   In which of the following arrangements, the sequence is not strictly according to the property written against it

   1. A.$\mathrm{C}{\mathrm{O}}_2<\mathrm{Si}{\mathrm{O}}_2<\mathrm{Sn}{\mathrm{O}}_2<\mathrm{Pb}{\mathrm{O}}_2$ : increasing oxidising power
   2. B.$\mathrm{HF}<\mathrm{HCl}<\mathrm{HBr}<\mathrm{HI}$ : increasing acid strength
   3. C.$\mathrm{N}{\mathrm{H}}_3<\mathrm{P}{\mathrm{H}}_3<\mathrm{As}{\mathrm{H}}_3<\mathrm{Sb}{\mathrm{H}}_3$ : increasing basic strength
   4. D.$\mathrm{B}<\mathrm{C}<\mathrm{O}<\mathrm{N}$ : increasing first ionization enthalpy
   Show answer

   Answer: C

4. Q752009 · 27 Apr 2009 · Shift 1

   The half life period of a first order chemical reaction is 6.93 minutes. The time required for the completion of 99% of the chemical reaction will be (log 2=0.301) :

   1. A.230.3 minutes
   2. B.23.03 minutes
   3. C.46.06 minutes
   4. D.460.6 minutes
   Show answer

   Answer: C

5. Q872009 · 27 Apr 2009 · Shift 1

   Which of the following statements is incorrect regarding physisorption ?

   1. A.It occurs because of van der Waals forces.
   2. B.More easily liquefiable gases are adsorbed readily.
   3. C.Under high pressure it results into multi molecular layer on adsorbent surface.
   4. D.Enthalpy of adsorption ($\Delta H_{adsorption}$ ) is low and positive
   Show answer

   Answer: D