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p-Block Elements Test - 4

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

     

    Which of the following statement is correct about the hydride of group 16 elements?

    Solution

     

    Order of acidic strength, thermal stability and melting points and boiling points are given in correct order.

     

  • Question 2
    4 / -1

    The pair that contains mixed oxides is

    Solution

    Mixed oxides are made up of two simple oxides like
    Pb3O4 (2PbO + PbO2), Fe3O4 (FeO + Fe2O3) , Mn3O4 (2MnO + MnO2) 

  • Question 3
    4 / -1

    The acid having a sulp hur atom with a lone pair of electrons on it, is

    Solution

    Sulphur having valency 6 do not possess lone pair while the sulphur with valency 4 possess one lone pair.

  • Question 4
    4 / -1

    Charring of cane sugar by sulphuric acid shows ...... property of the acid.

    Solution

    Cone. H2SO4 is a strong dehydrating agent. Many wet gases can be dried by passing them through sulphuric acid. H2SO4 removes water from organic compounds. It is evident by its charring action on carbohydrates.

  • Question 5
    4 / -1

    Which of the following statements is incorrect?

    Solution

    Disulphur dichlor

    The angle between  the   planes is 90°.
    The structure is referred to as gauche.

  • Question 6
    4 / -1

    xSo2 + yMnO-4 + zH2O → Mn2+ + SO42- + H+ . In this, three values of x, y, z are

    Solution

  • Question 7
    4 / -1

    Which of the following is wrong statement?

    Solution

    The chemical reaction of H2SO4 as a result of its low volatility, strong acidic character, stiong affinity for water and ability to act as an oxidising agent.

  • Question 8
    4 / -1

    Among the following oxyacids of sulphur, which one has more than one oxidation state for sulphur?

    Solution

    In thiosulphuric acid, S has both - 2 and + 6 oxidation states.

  • Question 9
    4 / -1

    In SO3 molecule, 3 oxygen atoms are attached to sulphur atom through double bonds. Hence, the molecules consist 3π-bonds. The types of pi-bonds present in SO3 molecule are

    Solution

    In gas phase, SO3 molecule is triangular planar having sp2-hybridisation of the S-atom. There are three sigma bonds formed by sp2-p overlap and three pi-bonds are by pπ-pπ overlap and two pπ-dπ overlap.

  • Question 10
    4 / -1

    Which of the following is known as C aro’s acid?

    Solution

    H2SO5 is known as Caro's acid or peroxysuiphuric acid.

  • Question 11
    4 / -1

     

    Statement I : In Caro’s acid (H2SO5), the oxidation state of sulphur is found to be +8.

    Statement II : In Caro’s acid, sulphur atom is attached to four oxygen atoms directly.

     

    Solution

     

    The oxidation state of sulphur in caro's acid is +6. The structure of the acid is

    The two of the attached O-atoms impart +2 oxidation state each to the sulphur atom and rest two O-atoms (single bonded) imparts +1 oxidation state each to the S-atom. Hence, S-atom has a total of +6 oxidation state

     

  • Question 12
    4 / -1

     

    The incorrect statements among the following are

     

    Solution

     

    In SO2, the oxidation state of S is + 4 , i.e. it can be increased or decreased. Hence, SO2 can act as both oxidant and reductant.

     

  • Question 13
    4 / -1

    The chemical species having sp2-hybridisation for the central atom is

    Solution

    SO3 are sp2-hybridised with triangular planar geometry.

  • Question 14
    4 / -1

     

    Find the amphoteric oxide

  • Question 15
    4 / -1

     

    Which pair is isostructural?

     

    Solution

     

    (i) CO2 and OCS both are sp-hybrid ised and have linear geometry.

     

  • 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

    Hydrated sodium thiosulphate, Na2S2O3 .5H2O is called hypo. It can be prepared by Spring’s reaction by adding iodine to a mixture of sodium sulphide and sodium sulphite.

    Na2S + Na2SO3 + I2 → 2NaI + Na2S2O3 (Spring's reaction)
    It is an efflorescent substance and at 215°C, it is completely dehydrated to Na2S2O3. Its reaction with iodine is used fo r the iodometric estimation of oxidising agents like CuSO4, CaOCI2, KMnO4, MnO2, etc., which on reaction with KI liberate I2. It is used in the bleaching industry to destroy excess chlorine on fabrics. It is used in photography as fixer since, it dissolves unexposed AgBr on the film.

    Q. 

    Select the incorrect statement regarding hypo.

    Solution

    In , central atom sulphur is sp3-hybridised and it has tetrahedral shape.

  • Question 17
    4 / -1

    Passage

    Hydrated sodium thiosulphate, Na2S2O3 .5H2O is called hypo. It can be prepared by Spring’s reaction by adding iodine to a mixture of sodium sulphide and sodium sulphite.

    Na2S + Na2SO3 + I2 → 2NaI + Na2S2O3 (Spring's reaction)

    It is an efflorescent substance and at 215°C, it is completely dehydrated to Na2S2O3. Its reaction with iodine is used fo r the iodometric estimation of oxidising agents like CuSO4, CaOCI2, KMnO4, MnO2, etc., which on reaction with KI liberate I2. It is used in the bleaching industry to destroy excess chlorine on fabrics. It is used in photography as fixer since, it dissolves unexposed AgBr on the film.

    Q. 

    In Na2S4O6, sulphur has different oxidation states. They are

    Solution

    The structure of Na2S4O6

    In this structure, two central sulphur atoms have zero oxidation number because electron pair forming th e S—S bond remain in the centre. Let the oxidation number of (remaining atoms) S atom be X.
    2(+1)+ 6(-2)+ 2x+ 2(0) = 0
    For Na for O

    ∴ Two central S-atoms have zero oxidation state and two terminal S- atoms have +5 oxidation state,

  • Question 18
    4 / -1

    Direction (Q. Nos. 18-20) 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

    The oxidation states of sulphur in H2SO3, H2SO4, and H2SO5 are respectively +4, +6 and +6.

  • 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

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

    Solution

  • Question 21
    4 / -1

     

    Graphite has a structural similarity with

  • Question 22
    4 / -1

     

    Which is the correct order of decreasing acidity of lewis acids?

  • Question 23
    4 / -1

     

    In the presence of KF, AlF3 is soluble in HF. Find the complex formed

  • Question 24
    4 / -1

     

    S-S bond is present in which of the ion pairs

  • Question 25
    4 / -1

     

    Which is the correct order of decreasing bond dissociation enthalpy?

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