d & f – Block Elements
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Questions and Answers

What is the reason for the decrease in atomic radii across the 3d series?

  • Poor shielding by d electrons, resulting in increased attraction (correct)
  • Increase in the number of unpaired electrons
  • Increase in nuclear charge and effective nuclear charge
  • Decrease in the number of electrons in the outermost shell

    • What is the effect of lanthanoid contraction on the atomic radii of the 4d and 5d series?

  • The radius of the 4d series is greater than the 5d series
  • The radius of the 5d series is greater than the 4d series
  • The radius of the 4d and 5d series is constant
  • The radius of the 4d series is similar to the radius of the 5d series (correct)

    • Which of the following elements has the lowest boiling point?

  • Zn
  • Hg (correct)
  • Cd
  • Sc

    • What is the reason for the increase in atomic radii from Ni to Cu to Zn?

    <p>Repulsion between electrons dominates attraction</p> Signup and view all the answers

    What is the effect of the filling of 4f orbitals on the atomic radii of the 5d series?

    <p>Decrease in atomic radii</p> Signup and view all the answers

    What is the reason for the gradual decrease in atomic radii from Sc to Mn?

    <p>Increase in nuclear charge and effective nuclear charge</p> Signup and view all the answers

    What is the primary reason for the lanthanoid contraction?

    <p>Increase in nuclear charge and attraction</p> Signup and view all the answers

    Which of the following statements is true about the trends in atomic radii in the lanthanoid series?

    <p>The atomic radii decrease gradually from Ti to Hf</p> Signup and view all the answers

    What is the effect of the shielding power of orbitals on the atomic radii?

    <p>It increases the atomic radii</p> Signup and view all the answers

    Which of the following elements has the smallest atomic radius?

    <p>Ti</p> Signup and view all the answers

    What is the primary reason for the actinoid contraction?

    <p>Increase in nuclear charge</p> Signup and view all the answers

    What is the trend in ionization enthalpy from left to right in a period?

    <p>It increases gradually</p> Signup and view all the answers

    What is the effect of lanthanoid contraction on the physical and chemical properties of 4d and 5d elements?

    <p>It makes them have very similar physical and chemical properties</p> Signup and view all the answers

    Which of the following statements is true about the electron configuration of actinoids?

    <p>5f orbitals extend in space more than 4f orbitals</p> Signup and view all the answers

    What is the trend in atomic radii across the actinoid series?

    <p>Gradual decrease in atomic radii</p> Signup and view all the answers

    Why do actinoids resemble lanthanoids in their oxidation states?

    <p>Due to similar electron configurations</p> Signup and view all the answers

    What is the result of the poor shielding effect of 5f orbitals in actinoids?

    <p>Increased attraction between the nucleus and electrons</p> Signup and view all the answers

    Which of the following statements is false about the oxidation states of actinoids?

    <p>Actinoids have more compounds in +4 state than in +3 state</p> Signup and view all the answers

    What is the colour of the ion Mn2+?

    <p>Light pink</p> Signup and view all the answers

    What is the reason for the formation of coloured ions?

    <p>Due to the excitation of an electron from a lower energy d orbital to a higher energy d-orbital</p> Signup and view all the answers

    What is an example of a complex compound?

    <p>[Fe(CN)6]3–</p> Signup and view all the answers

    What is the name of the test that forms a brown ring at the junction of two layers?

    <p>Brown Ring Test</p> Signup and view all the answers

    Why do transition metals show catalytic property?

    <p>All of the above</p> Signup and view all the answers

    Which of the following ions is known to have a yellow colour?

    <p>Fe3+</p> Signup and view all the answers

    What is the solubility of copper oxide (CuO) in water?

    <p>Insoluble</p> Signup and view all the answers

    What is the product of the reaction between copper carbonate and dilute sulphuric acid?

    <p>CuSO4</p> Signup and view all the answers

    What is the use of blue vitriol (CuSO4) in a specific industry?

    <p>All of the above</p> Signup and view all the answers

    What is the reaction product when iron wire reacts with dry chlorine gas?

    <p>FeCl3</p> Signup and view all the answers

    What is the characteristic of the solution of ferric chloride (FeCl3) in water?

    <p>Acidic</p> Signup and view all the answers

    What is the crystalline form of green vitriol (FeSO4)?

    <p>FeSO4.7H2O</p> Signup and view all the answers

    What is the reason why most actinoid metals are less affected by nitric acid?

    <p>Formation of a protective oxide layer</p> Signup and view all the answers

    Which of the following is a use of d and f block elements?

    <p>Alloying metals for iron and steel production</p> Signup and view all the answers

    What is the role of TiO2 in dry cell batteries?

    <p>It is used as a white pigment</p> Signup and view all the answers

    Which catalyst is used in the contact process?

    <p>V2O5</p> Signup and view all the answers

    What is the role of nickel in the Haber process?

    <p>It acts as a catalyst</p> Signup and view all the answers

    Which process uses a nickel complex as a catalyst?

    <p>Polymerisation of alkynes and benzene</p> Signup and view all the answers

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