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p-Block Elements Test - 5

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p-Block Elements Test - 5
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  • Question 1
    4 / -1

    Which of the following property decreases down the group in the halogens?

    Solution

    Due to increase in atomic size, ionisation enthalpy decreases down the group.

     

  • Question 2
    4 / -1

    Which of the following represents the decreasing order of van der Waals’ forces in halogens ?

    Solution

    Melting point increases with halogens from fluorine to iodine because van der Waals’ forces are stronger down the groups.

  • Question 3
    4 / -1

     The correct order of in creasing order of radiiions Br- , F-, O2- and S2-  is as follow

    Solution

    Atomic and ionic radii increase down the group due to increasing number of quantum shells.

  • Question 4
    4 / -1

    The correct order for the percentage of ionic character is

    Solution

    As the electronegativity of halogen decreases, the dipole moment of the hydrogen halide and hence, the ionic character decreases in the same order, i.e. HI < HBr < HCI < HF.

  • Question 5
    4 / -1

    Which of the following statement is incorrect ?

    Solution

    The correct order of bond dissociation enthalpy is

  • Question 6
    4 / -1

    Which option is incorrect among the following for the given property?

    Solution

    Thermal stability decreases as the strength of H-X bond decreases which in turn decreases as the size of the halogen increases, i.e. HF > HCI > HBr > HI

  • Question 7
    4 / -1

    When Cl2 gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from

    Solution

    When chlorine gas reacts with hot and concentrate NaOH solution, it disproportionates into Chloride (Cl-) and Chlorate (ClO3-) ions.

  • Question 8
    4 / -1

    Which of the following does not exist?

    Solution

    Fluorine has no d-orbitals in the valence shell. Hence, it always show - 1 oxidation state and monovalency in its compounds.

  • Question 9
    4 / -1

    One gas bleaches the colour of flowers by reduction and another gas by oxidation. The gases respectively are

    Solution

    Cl2 bleaches by oxidation while SO2 does it by reduction.

  • Question 10
    4 / -1

    Solid iodine is an example of

    Solution

     Solid iodine is a molecular solid.

  • Question 11
    4 / -1

     

    The fluoride ores are

     

    Solution

     

    The cryolite (Na3AIF6) is ore of fluoride.

     

  • Question 12
    4 / -1

    Which of the following is/are correct among the following?

    Solution

    Hybridisation of the compounds are

     

  • Question 13
    4 / -1

    The oxidation number of oxygen in O2PtF6 is

    Solution

    The structure of O2PtF6 is  O+2 [PtF6]-.
    Oxidation tate of O2 = 2x = +1
    x = + 1/2

  • Question 14
    4 / -1

     

    The source of iodine is

     

    Solution

    Correct Answer : b

    Explanation : Fish (such as cod and tuna), seaweed, shrimp, and other seafood, which are generally rich in iodine. Dairy products (such as milk, yogurt, and cheese) and products made from grains (like breads and cereals), which are the major sources of iodine in American diets.

  • Question 15
    4 / -1

    Which of the following reaction occurs?

    Solution

    All the cases are possible reactions.

  • Question 16
    4 / -1

    Direction (Q. Nos. 16 and 17) This section contains a paragraph, describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).

    Passage

    Group 17 elements are known as halogens ( sea salt forming). Their general configuration is ns2np5 where, n = 2 to 7. Fluorine is the first member of the group differs in several ways from the rest of the group. Halogens are highly reactive elements having strong affinity for hydrogen. All the halogens form both ionic and covalent compounds .Fluorine is always monovalent and shows -1 oxidation state in its compounds .The other halogens exhibit 1, 3, 5, 7 valencies in their compounds and show - 1 to + 7 oxidation states.

    Q. Valence shell configuration that belongs to most reactive non-metal is

    Solution

    All the halogens are highly reactive. They react with metals and non-metals to form halides due to readily acceptance of an electron

  • Question 17
    4 / -1

    Passage

    Group 17 elements are known as halogens ( sea salt forming). Their general configuration is ns2np5 where, n = 2 to 7. Fluorine is the first member of the group differs in several ways from the rest of the group. Halogens are highly reactive elements having strong affinity for hydrogen. All the halogens form both ionic and covalent compounds .Fluorine is always monovalent and shows -1 oxidation state in its compounds .The other halogens exhibit 1, 3, 5, 7 valencies in their compounds and show - 1 to + 7 oxidation states.

    Q. 

    In which of the following chlorine has different oxidation states?

    Solution

    In calcium oxychloride (CaOCI)CI) has different oxidation states, Hence, chlorine has +1 and -1 oxidation states.

  • Question 18
    4 / -1

    Direction (Q. No. 18 and 19) Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.

    Q. 

    Match the Column I with Column II and mark the correct option from the codes given below.

     

    Solution

  • Question 19
    4 / -1

    Match the Column I with Column II and mark the correct option from the codes given below.

     

    Solution

  • Question 20
    4 / -1

    Nitrogen is relatively inactive element because:

    Solution

    Nitrogen is an inactive element as it has a high bond dissociation energy due to the presence of triple bond N ≡ N. Hence, viewed as a non-reactive element.

  • Question 21
    4 / -1

     

    In the MOT of F2 molecule, number of electrons occupying antibonding orbitals are

     

    Solution

    Fluorine atom have 2+7 electrons so an F2 molecule contain 18 electrons.

    Hence, 8 electrons occupy the antibonding orbitals.

     

  • Question 22
    4 / -1

     

    The total number of positive oxidation states shown by fluorine is

     

    Solution

     

    Fluorine show only one positive oxidation state of +1 in HOF while all of the halogens show positive oxidation state of +1, +3, +5 and +7.

     

  • Question 23
    4 / -1

     

    When carnallite is dissolved in water the number of ions formed are

     

    Solution

     

    Carnallite is a double salt. It will dissociate into simple substances or ions completely when dissolved in water.

    Hence, 5 ions are produced.

  • Question 24
    4 / -1

     

    The number of water insoluble salts among

    AgF, AgCI, AgBr, Agl BeF2, CaF2,KF, PbCI2, HgCI2

     

    Solution

     

    AgCI, AgBr, Agl CaF2, PbCI2, HgCI2, are water insoluble.

  • Question 25
    4 / -1

    Statement I : All halogens are coloured.

    Statement II : Halogens absorbs part of the light in the visible region.

    Solution

    Halogen molecule absorbs light in the visible region as a result of which their electrons are excited to higher energy level while the remaining light is transmitted.
    The colour of halogens is actually the colour of this transmitted light, i.e. halogens have complementary colours.

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