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JEE Main Test 39

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JEE Main Test 39
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Weekly Quiz Competition
  • Question 1
    4 / -1

    Amongst the halogens F0, Cl2, Br2, l2 the correct arrangement on the basis of increasing m.p. is

    Solution

    The halogens are molecular crystals in the solid state held together by van der Waals’ forces which increase with increase in size of the atom; so the melting point of halogens increase with increase in size of atom.

  • Question 2
    4 / -1

    The correct sequence of paramagnetism of Cr3+,Fe2+,Cu+andCu2+ is:

    Solution

    Cr3+(3d3),Fe2+(3d6),Cu+(3d10) and Cu2+ (3d9) have 3, 4, 0 and 1 unpaired electrons respectively.

  • Question 3
    4 / -1

    Blast furnace process is the process for

    Solution

    Blast furnace process is the process for extraction of pig iron from roasted haematite.

  • Question 4
    4 / -1

    Atomic size of Zr and Hf is almost the same because of

    Solution

    lanthanide contraction is the reason behind the almost same atomic size or Zr and Hf.

  • Question 5
    4 / -1

    Which of the following reagents can be used to distinguish Fe3+ and Fe2+ in aqueous solution

    Solution

    Fe3+ 3KSCN → Fe(SCN)3 (red coloured)

    3Fe2+ 2K3[Fe(CN)6] → Fe3[Fe(CN)6]2

    (blue coloured)

  • Question 6
    4 / -1

    Silicon carbide is used as a / an

    Solution

    Abrasive is tough material used for sharpening and grinding the uneven surfaces and silicon carbide is used for grinding glass.

  • Question 7
    4 / -1

    Which of the following sets of hybridized orbitals does not maximize the angles between the bond pairs?

    Solution

    The sp3d hybrids have 90° and 120° angles. Rearrangement of bond, angles could produce angle greater than 90° but at the loss of highly symmetrical structure.

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