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Chemistry Test 212

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Chemistry Test 212
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  • Question 1
    4 / -1

    Why the size of an anion is larger than the parent atom?

    Solution

    The size of an anion will be larger than that of the parent atom because the addition of one or more electron(s) would result in increased repulsion among the electrons and a decrease in effective nuclear charge.

     

  • Question 2
    4 / -1

    What are the exceptions of the octet rule ?

    Solution

    According to octet role, the central atom must have 8 electrons but in some compounds the number of electrons is more than 8, or less than 8 or an odd number of electrons is left on the central atom eg., PCl5, BF5, NO.

     

  • Question 3
    4 / -1

    The structure of H2O2 is

    Solution

    Hydrogen peroxide has a non-planar structure.

     

  • Question 4
    4 / -1

    The volume strength of 1.5NH2O2 solution is

    Solution

    Normality (N) = 1.5

    We know that equivalent weight of H2O2 is 17 and strength of H2O2 = Normality × Equivalent weight

    = 1.5 × 17 = 25.5

    2H2O2 → 2H2O+ O2

    (234 = 68g) (22.4)L

    since 68 grams of H2O2 produces 22.4 litres oxygen at NTP, therefore 25.5 grams of H2O2 will produce = 22.4/68 × 25.5 = 8.4 litre of oxygen.

    Thus, volume strength of given H2O2 solution is 8.4.

     

  • Question 5
    4 / -1

    Formation of interstitial compound makes the transition metal

    Solution

    A covalent bond is formed between small interstial non-metal and transition metal which make it hard

     

  • Question 6
    4 / -1

    The element with positive electron gain enthalpy is

    Solution

    Noble gases have positive values of electron gain enthalpy because the anion is higher in energy than the isolated atom and electron.

     

  • Question 7
    4 / -1

    The correct order of the O-O bond length in O2,H2O2 and O3 is

    Solution

    ond length of O−O in O2 is 1.21Å (O = O); in H2O2 is 1.48Å(HO−OH) and in O3 is 1.28Å

     

  • Question 8
    4 / -1

    Which of the following has sp2 -hybridisation?

    Solution

    BeCl2 and C2H2 have sp -hybridisation and C2H6 has sp3 -hybridisation.

     

  • Question 9
    4 / -1

    Energy required to completely separate one mole of a solid ionic compound into gaseous constituent ions is called ___

    Solution

    Lattice enthalpy is required to completely separate one mole of a solid ionic compound into gaseous constituent ions.

     

  • Question 10
    4 / -1

    Hydrogen peroxide molecules are

    Solution

    H2O2 is diatomic and forms H+ + HO2−(X−) (hydroperoxide ion).

     

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