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11th Standard English Medium Chemistry Subject Periodic Classification of Elements Book Back 1 Mark Questions with Solution Part - II

11th Standard

    Reg.No. :
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Chemistry

Time : 00:30:00 Hrs
Total Marks : 5

    Part I

    5 x 1 = 5
  1. The electronic configuration of the elements A and B are 1s2, 2s 2,2p6,3s2 and 1s2, 2s2,2p5 respectively. The formula of the ionic compound that can be formed between these elements is ___________

    (a)

    AB

    (b)

    AB2

    (c)

    A2B

    (d)

    none of the above

  2. In which of the following options the order of arrangement does not agree with the variation of property indicated against it?

    (a)

    I< Br < CI < F (increasing electron gain enthalpy)

    (b)

    Li < Na < K < Rb (increasing metallic radius)

    (c)

    Al3+< Mg2+ < Na+ - (increasing ionic size)

    (d)

    B < C < O < N (increasing first ionisation enthalpy)

  3. Various successive ionisation enthalpies (in kJ mol-1) of an element are given below.

    IE1 IE2 IE3 IE4 IE5
    577.5 1,810 2,750 11,580 14,820

    The element is

    (a)

    phosphorus

    (b)

    Sodium

    (c)

    Aluminium

    (d)

    Silicon

  4. Identify the wrong statement.

    (a)

    Amongst the isoelectronic species, smaller the positive charge on cation, smaller is the ionic radius

    (b)

    Amongst isoelectric species greater the negative charge on the anion, larger is the ionic radius

    (c)

    Atomic radius of the elements increases as one moves down the first group of the periodic table

    (d)

    Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the periodic table.

  5. The correct order of electron gain enthalpy with negative sign of F, Cl, Br and I having atomic number 9, 17, 35 and 53 respectively is _____________

    (a)

    I > Br > Cl > F

    (b)

    F > Cl > Br > I

    (c)

    Cl > F > Br > I

    (d)

    Br > I > Cl > F

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