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Chemistry Test 29
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Chemistry Test 29
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  • Question 1/6
    4 / -1

    Which dioxide of group 16 element is not solid at room temperature?

    Solutions

    Among the given species SO2 is gas while SeO2 and TeO2 are solids.

  • Question 2/6
    4 / -1

    The decreasing values of bond angles from NH3 (106o) to SbH3 (101o) down group-15 of the periodic table is due to

    Solutions

    Because of having same group decreasing electronegativity is the answer

  • Question 3/6
    4 / -1

    In XeF2, the three lone pairs occupy:

    Solutions

    XeF2 has sp3d hybridisation with two bond pairs and three lone pairs. To minimise the repulsion between the lone pairs and bond pairs, all the lone pairs occupy the equatorial positions. The bond pairs occupy the axial positions.

  • Question 4/6
    4 / -1

    Boron compounds behave as Lewis acid because of their

    Solutions

    A Lewis acid is therefore any substance, such as the H+ ion, that can accept a pair of nonbonding electrons. In other words, a Lewis acid is an electron-pair acceptor. In boron compound, boron has generally six electrons in its valence shell and hence can accept two more electrons.

  • Question 5/6
    4 / -1

    Graphite is a good conductor of electricity because:

    Solutions

    Graphite contains layers of carbon atoms. The layers slide over each other easily because there are only weak forces between them, making graphite slippery. These electrons can move through the graphite, carrying charge from place to place and allowing graphite to conduct electricity.

  • Question 6/6
    4 / -1

    Among hypohalous acids, the acids with higher Ka value is:

    Solutions

    Greater the electronegativity of the halogen atoms in the oxyacid, greater is the acidic character of the oxoacid of halogen. HFO does not exist because F doesn’t form oxyacid due to the absence of d- orbitals in its valence shell. Hence, HClO has the highest Ka.

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