JEE Advance - Chemistry (1995)

• 1

  At 380^oC, the half-life period for the first order decomposition of H₂O₂ is 360 min. Calculate the time required for 75% decomposition at 450^oC.

  回答

  (B)

  20.34 min
• 1

  Number of paired electrons in O₂ molecules is

  回答

  (D)

  14
• 2

  An excess of liquid mercury is added to an acidified solution of 1.0 $$\times$$ 10^-3 M Fe³⁺. It is found that 5% of Fe³⁺ remains at equilibrium at 25^oC. Calculate $$E_{Hg_2^{2 + }|\,Hg}^o$$, assuming that only reaction that occurs is
  2Hg + 2Fe³⁺ $$\to$$ $$Hg_2^{2+}$$ + 2Fe²⁺
  (Given $$E_{F{e^{3 + }}|\,F{e^{2 + }}}^o$$ = 0.77 V)

  回答

  (B)

  0.798 V
• 2

  Which one is most ionic

  回答

  (C)

  MnO
• 3

  A 5.0 cm³ solution of H₂O₂ liberates 0.508 g of iodine from an acidified KI solution. Calculate the strength of H₂O₂ solution in terms of volume strength at STP.

  回答

  (B)

  4.48 volumes
• 3

  Which has most stable +2 oxidation state?

  回答

  (B)

  Pb
• 4

  Iodine molecule dissociates into atoms after absorbing light of 4500 Å. If one quantum of radiation is absorbed by each molecule, calculate the kinetic energy of iodine atoms. (Bond energy of I₂ = 240 kJ mol^-1)

  回答

  (B)

  2.15 x 10^-20 J
• 4

  A 3p orbital has

  回答

  (C)

  one spherical and one non spherical node