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p-Block Element...

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  • Question 1
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    Which is incorrect statement?

     

  • Question 2
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    In earth’s crust, sulphur exists as

  • Question 3
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    The element used in the production of photocells and solar cells and also used in zerox machines is

  • Question 4
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    The number of bond pairs and lone pairs in rhombic sulphur molecule are

  • Question 5
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    Which has lowest bond energy (single bond)?

  • Question 6
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    Harmful UV radiations emitted from the sun are prevented from reaching the earth by the presence of ozone in the

  • Question 7
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    Point out the incorrect statement among the following.

  • Question 8
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    The correct order of thermal stability of the hydrides of group 16 elements is

  • Question 9
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    When O2 changes to 

  • Question 10
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    Increasing order of oxidation number of oxygen is found in

  • Question 11
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    Q.  Which of the following property do not increase down the group from oxygen to polonium?

     

  • Question 12
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    Which trend enthalpy is correct ?

  • Question 13
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    Boiling Point of liquid nitrogen is

  • Question 14
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    Which is the correct order w.r.t the given property?

  • Question 15
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    Which among the following forms basic oxide?

  • Question 16
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    Passage

    Sulphur and the rest of the elements of 16th group are less electronegative than oxygen. They can acquire ns2np6 by sharing two electrons with the atoms of other elements and thus, exhibit +2 oxidation state in their compounds, in addition to this, atoms have vacant d-orbitals in their valence shell due to which electrons I can be promoted from the s- and p-orbitals of the same shell. As a result, they can show +4 and +6 oxidation states. The oxidation states of elements never exceed +6.

    Q.

    Oxidation states of sulphur in H2S2O7 and H2S2O8 respectively are

     

  • Question 17
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    Passage

    Sulphur and the rest of the elements of 16th group are less electronegative than oxygen. They can acquire ns2np6 by sharing two electrons with the atoms of other elements and thus, exhibit +2 oxidation state in their compounds, in addition to this, atoms have vacant d-orbitals in their valence shell due to which electrons I can be promoted from the s- and p-orbitals of the same shell. As a result, they can show +4 and +6 oxidation states. The oxidation states of elements never exceed +6.

    Q. 

    Like sulphur, oxygen does not show +4 and +6 oxidation states .The reason is

  • Question 18
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    Match the Column I with Column II and mark the correct option from the codes given below.

     

  • Question 19
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    Match the Column I with Column II and mark the correct option from the codes given below.

  • Question 20
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    Match the Column i with Column II and mark the correct option from the codes given below.

  • Question 21
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    Direction (Q. Nos. 21-24) This section contains 4 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

    Q. 

    Number of chemicals that produce dioxygen on heating

    KCIO3, (NH4)2 Cr2O7, NH4NO3, NaNO3, KMnO4, K2Cr2O7, H2O2, Pb3O4, NH4NO2

     

  • Question 22
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    In the fully excited state, number of unpaired electrons in tellurium are

     

  • Question 23
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    Number of chemical species having bent shape in 

     

  • Question 24
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    Among the following compounds, the number of compounds which have oxidation states of S is +4 ?

    PbS, SO2, SF6, Na2S2O3, H2SO3

     

  • Question 25
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    Direction (Q. No. 25) This section is based on Statement I and Statement II. Select the correct answer from the codes given below.

    Q. 

    Statement I : Oxygen is more electronegative than sulphur, yet H2S is acidic, while H2O is neutral.

    Statement II : H— S bond is weaker than O—H bond.

     

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