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 (B)</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 (A)</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 (B)</p> Signup and view all the answers

What is the primary reason for the lanthanoid contraction?

<p>Increase in nuclear charge and attraction (C)</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 (C)</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 (A)</p> Signup and view all the answers

Which of the following elements has the smallest atomic radius?

<p>Ti (A)</p> Signup and view all the answers

What is the primary reason for the actinoid contraction?

<p>Increase in nuclear charge (B)</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 (A)</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 (C)</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 (D)</p> Signup and view all the answers

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

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

Why do actinoids resemble lanthanoids in their oxidation states?

<p>Due to similar electron configurations (A)</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 (D)</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 (C)</p> Signup and view all the answers

What is the colour of the ion Mn2+?

<p>Light pink (C)</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 (A)</p> Signup and view all the answers

What is an example of a complex compound?

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

Why do transition metals show catalytic property?

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

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

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

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

<p>Insoluble (C)</p> Signup and view all the answers

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

<p>CuSO4 (A)</p> Signup and view all the answers

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

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

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

<p>FeCl3 (A)</p> Signup and view all the answers

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

<p>Acidic (A)</p> Signup and view all the answers

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

<p>FeSO4.7H2O (D)</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 (C)</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 (A)</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 (A)</p> Signup and view all the answers

Which catalyst is used in the contact process?

<p>V2O5 (A)</p> Signup and view all the answers

What is the role of nickel in the Haber process?

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

Which process uses a nickel complex as a catalyst?

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

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