JEE Advance - Chemistry (1997)

• 1

  Which one of the following compounds has sp² hybridization?

  回答

  (B)

  SO₂
• 2

  For a d-electron the orbital angular momentum is

  回答

  (A)

  $$\sqrt 6 \left( {h/2\pi } \right)$$
• 3

  The critical temperature of water is higher than that of O₂ because the H₂O molecule has

  回答

  (D)

  dipole moment
• 4

  Which contains both polar and non-polar bonds?

  回答

  (C)

  H₂O₂
• 5

  A compound of vanadium has a magnetic moment of 1.73 BM. Work out the electronic configuration of the vanadium ion in the compound.

  回答

  (D)

  1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹
• 6

  Give reasons of the following:
  The crystalline salts of alkaline earth metals contain more water of crystallisation than the corresponding alkali metal salts.

  回答

  A

  C

  D
• 7

  To a 25ml H₂O₂ solution, excess of acidified solution of potassium iodide was added. The iodine liberated required 20 ml of 0.3 N sodium thiosulphate solution. Calculate the volume strength of H₂O₂ solution.

  回答

  (B)

  1.344
• 8

  Give reactions for the oxidation of hydrogen peroxide with potassium permanganate in acidic medium.

  回答

  A

  B

  C
• 9

  Element A burns in nitrogen to give an ionic compound B. Compound B reacts with water to give C and D. A solution of C becomes 'milky' on bubbling carbon dioxide. Identify A, B, C and D.

  回答

  (C)

  A = Ba, B = Ba₃N₂, C = Ba(OH)₂, D = NH₃
• 10

  Arrange the following sulphates of Alkaline earth metals in order of decreasing thermal stability : BeSO₄, MgSO₄, CaSO₄, SrSO₄

  回答

  (D)

  SrSO₄ > CaSO₄ > MgSO₄ > BeSO₄
• 11

  How many grams of silver could be plated out on a serving tray by electrolysis of a solution containing silver in +1 oxidation state for a period of 8.0 hours at a current of 8.46 amperes? What is the area of the tray if the thickness of the silver plating is 0.00254 cm? Density of silver is 10.5 g/cm³

  回答

  (A)

  272.6 g, 1.02 x 10^3 cm^2
• 12

  Calculate the equilibrium constant for the reaction
  Fe²⁺ + Ce⁴⁺ $$\leftrightharpoons$$ Fe³⁺ + Ce³⁺
  (given $$E_{C{e^{4 + }}/C{e^{3 + }}}^o$$ = 1.44 V; $$E_{F{e^{3 + }}/F{e^{2 + }}}^o$$ = 0.68 V)

  回答

  (D)

  7.2 x 10¹²