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Chemistry Test - 5

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Chemistry Test - 5
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Weekly Quiz Competition
  • Question 1
    3 / -1

    Among the following, element that has the highest electronegativity is

    Solution

    Because of small atomic size and high nuclear charge, oxygen has the highest electronegativity among the given

  • Question 2
    3 / -1

    Compare the stability of the following carbanions:

    i. OH− i . O H -

    ii.SH−

    iii. Cl−

    Solution

    Greater the charge to size ratio, lesser is the stability of an anion. i  is smallest while ii is largest anion. So i is most stable while ii is least.

  • Question 3
    3 / -1

    The first (ΔiH1) and the second (ΔiH2) ionization enthalpies (in kJ mol−1) and the ΔegH ∆ egH electron gain enthalpy (in kJ mol−1) of a few elements are given below:

    Which of the above is likely to be the metal which can form a predominantly stable covalent halide of the formula MX MX (X = halogen)?

    Solution

    Element I has low ΔiH1 but very high ΔiH2 . It has less negative electron gain enthalpy. So, element (I) is an alkali metal.
    The given values for element I match with lithium. Lithium forms predominantly stable covalent halide of the formula MX.
    LiCl is soluble in ethanol because it is predominantly covalent in nature.

  • Question 4
    3 / -1

    Which of the following arrangements represents the increasing order (smallest to largest) of ionic radii of the given species O2-, S2-, N3-, P3- ?

    Solution

    N3- and O2- are isoelectronic as z/e increases ionic size decreases.

    O2- < N3-

    S2- and P3- are isoelectronic asze z/e increases ionic size decreases S2- < P3-

    But down the group size increases

    S2- > O2- and P3- > N3-

    ∴ O2−<N3−<S2−<P3−

  • Question 5
    3 / -1

    A sudden large jump between the values of second and third ionisation energies of an element would be associated with the electronic configuration

    Solution

    1s2, 2s2, 2p6, 3s2 - In III transition e- is to be removed from stable configuration

  • Question 6
    3 / -1

    The element having 18 electrons in its outermost shell is:

    Solution

    The element having 18 electrons in its outermost shell is:

  • Question 7
    3 / -1

    Of the following elements, which one has the highest electronegativity?

    Solution

    The ability of an atom to pull the shared pair of electrons towards itself is known as electronegativity. F has the highest electronegativity because of its smallest size. As we move left to right across the periodic table electronegativity increases and down the group it will decrease.

  • Question 8
    3 / -1

    Among the following, select the incorrect statement about the helium.

    Solution

    The last electron of helium enter in 1s orbital but due to full filled orbit, it is placed with the p-block element in modern periodic table.

  • Question 9
    3 / -1

    What will be the correct order of 2nd ionization potentials of the elements Na, K, Al, Mg.

    Solution

    order of 2nd 2 nd I.P. will be Na>K>Al>Mg Na > K > Al > Mg .

  • Question 10
    3 / -1

    The electroplating technique was given by

    Solution

    First of all the technique of electroplating was given by Faraday.

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