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The p-Block Elements Test - 11

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The p-Block Elements Test - 11
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  • Question 1
    1 / -0

    On addition of conc. H2SO4 to chloride salt, colorless fumes are evolved but in case of iodide salt, violet fumes come out. This is because

    Solution

    On addition of conc. H2SO4 to chloride salt, colorless fumes are evolved but in case of iodide salt, violet fumes come out. This is because of HI gets oxidised to I2.

     

  • Question 2
    1 / -0

    Which of the following elements can be involved in pπ–dπ bonding?

    Solution

    Phosphorus involved in pπ–dπ bonding.

     

  • Question 3
    1 / -0

    Affinity for hydrogen decreases in the group from fluorine to iodine. Which of the halogen acids should have highest bond dissociation enthalpy?

    Solution

    HF > HCl > HBr > HI

    On moving top to bottom in halogens the size of halogen increases subsequently, the H-X bond length increases and bond dissociation enthalpy decreases.

     

  • Question 4
    1 / -0

    Which of the following acids forms three series of salts?

    Solution

    Orthophosphoric acid, H3PO4, is usually called simply phosphoric acid. When pure,Phosphoric acid forms three classes of salts corresponding to replacement of one, two, or three hydrogen atoms. Metaphosphoric acids, (HPO3)n, in which n = 3, 4, 5, are another class of polymeric phosphoric acids.

     

  • Question 5
    1 / -0

    Strong reducing behavior of H3PO2 is due to

    Solution

    Strong reducing behavior of H3PO2 is due to Presence of one –OH group and two P–H bonds.

     

  • Question 6
    1 / -0

    Which of the following elements does not show allotropy?

    Solution

    Nitrogen does not show allotropic form. Because it can be stable in triple bond only and weak in single bond.

    Therefore, nitrogen does not exist in different forms. It can be able to bond with only some elements.

     

  • Question 7
    1 / -0

    Maximum covalency of nitrogen is………..

    Solution

    Nitrogen has maximum covalency 4, because we know that maximum electrons a shell can accommodate are 2n2, and hence it can have only 8 electrons. So covalency cannot exceed more than 4.

     

  • Question 8
    1 / -0

    The oxidation state of central atom in the anion of compound NaH2PO2 will be……..

    Solution

    The oxidation state of central atom in the anion of compound NaH2PO2 will is +1.

     

  • Question 9
    1 / -0

    Which of the following is oxidised by SO2?

    Solution

    SO2 + 2Mg → 2MgO + S

     

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