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JEE Advance - Chemistry (1987)

  • 1
    sp2 hybrid orbitals have equal s and p character.
    Răspuns
    (B)
    FALSE
  • 2
    The brown ring complex compound is formulated as [Fe(H2O)5(NO)+]SO4. The oxidation state of iron is
    Răspuns
    (A)
    1
  • 3
    (i) What is the weight of sodium bromate and molarity pf solution necessary to prepare 85.5 ml of 0.672 B solution when the half-cell reaction is

    $$BrO_3^- + 6H^+ + 6e^- \to $$ $$Br^- + 3H_2O$$

    (ii) What would be the weight as well as molarity if the half-cell reaction is:

    $$2BrO_3^- + 12H^+ + 10e^- \to$$ $$Br_2 \,+ 6H_2O$$
    Răspuns
    (A)
    (i) 1.446 gm, 0.112 M; (ii) 1.7532 g, 0.1344 M
  • 4
    In group IA, of alkali metals, the ionisation potential decreases on moving down the group. Therefore, lithium is a strongest reducing agent
    Răspuns
    (B)
    FALSE
  • 5
    The first ionisation potential in electron volts of nitrogen and oxygen atoms are respectively given by
    Răspuns
    (A)
    14.6, 13.6
  • 6
    Atomic radii of fluorine and neon in Angstrom units are respectively given by
    Răspuns
    (A)
    0.72, 1.60
  • 7
    The electronegativity of the following elements increases in the order
    Răspuns
    (C)
    Si, P, C, N
  • 8
    In benzene, carbon uses all the three p-orbitals for hybridisation.
    Răspuns
    (B)
    FALSE
  • 9
    Hydrogen bond is maximum in
    Răspuns
    (A)
    Ethanol
  • 10
    The value of PV for 5.6 litres of an ideal gas is ________ RT, at NTP.
    Răspuns
    0.25
  • 11
    A spherical balloon of 21 cm diameter is to be filled up with hydrogen at N.T.P from a cylinder containing the gas at 20 atmospheres at 27oC. If the cylinder can hold 2.82 litres of water, calculate the number of balloons that can be filled up.
    Răspuns
    10
  • 12
    Sodium when burnt in excess of oxygen gives sodium oxide.
    Răspuns
    (B)
    FALSE
  • 13
    The metallic lustre exhibited by sodium is explained by
    Răspuns
    (B)
    oscillation of loose electrons
  • 14
    Give reasons of the following :
    Magnesium oxide is used for the lining of steel making furnace.
    Răspuns
    (C)
    Magnesium oxide is basic in nature and reacts with acidic impurities of the steel making process.
  • 15
    Give reasons of the following:
    Why is sodium chloride added during electrolysis of fused anhydrous magnesium chloride?
    Răspuns
    (C)
    To increase the electrical conductivity of the electrolyte.
  • 16
    The IUPAC name of the compound
    CH2 = CH $$-$$ CH(CH3)2
    Răspuns
    (B)
    3-methylbut-1-ene
  • 17
    An unknown compound of carbon, hydrogen and oxygen contains 69.77% carbon and 11.63% hydrogen and has a molecular weight of 86. It does not reduce Fehling solution, but forms a bisulphite addition compound and gives a positive iodoform test. What are the possible structures?
    Răspuns
    (A)