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D and F block elements


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15 questions
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  • Q1

    CuSO4 is paramagnetic while ZnSO4 is diamagnetic because

    Cu2+ ion has 3d9 configuration while Zn2+ion has 3d10 configuration

    Cu2+ has half filled orbitals while Zn2+ hasfully filled orbitals

    CuSO4 is blue in colour while ZnSO4 iswhite.

    Cu2+ ion has 3d5 configuration while Zn2+ion has 3d6 configuration

  • Q2

    The magnetic moment of a divalent ion inaqueous solution with atomic number 25 is

    9.9 B.M

    6.9 B.M

    5.9 B.M

    2.9 B.M

  • Q3

    Highest oxidation state of manganese influoride is +4 (MnF4) but highest oxidation statein oxides is +7 (Mn2O7) because

    fluorine does not possess d-orbitals

    fluorine stabilises lower oxidation state

    in covalent compounds, fluorine can form single bond only while oxygen forms double bond.

    fluorine is more electronegative than oxygen

  • Q4

    Which of the following transition metal ions is colourless?





  • Q5

    Which of the following d-block element has half-filled penultimate as well as valence subshell?





  • Q6

    E°Mn3+/Mn2+ is highly positive than that of E°Cr3+/Cr2+ or E°Fe3+/Fe2+ because

    Mn3+ is more stable than Mn2+ due to higher oxidation state.

    second ionisation enthalpy of Mn is higher than third ionisation enthalpy.

    third ionisation enthalpy of Mn is much larger due to stable half filled d5 electronic configuration of Mn2+

    Mn2+ (d5) can be easily oxidised to Mn3+(d4)due to low ionisation enthalpy

  • Q7

    Interstitial compounds are nonstoichiometric compounds formed by trapping small atoms like C, H or N in crystal lattices of transition metals. Which of the following properties is not shown by these compounds?

    They are chemically very reactive.

    They are very hard, some borides arecomparable to diamond in hardness.

    They retain metallic conductivity.

    They have high melting points, higher than those of pure metals

  • Q8

    Cu+ ion is not stable in aqueous solution because

    hydration energy of Cu+(aq) is much more negative than that of Cu2+(aq)

    large value of second ionisation enthalpy of copper is compensated by much more negative hydration energy of Cu2+(aq)

    many copper (I) compounds are unstable in aqueous solution and undergo disproportionation reaction.

    second ionisation enthalpy of copper is less than the first ionisation enthalpy

  • Q9

    Following order is observed in oxidizing power of certain ions:VO2+ < Cr2O72– < MnO4 - 

    increasing stability of the lower species to which they are reduced

    increasing stability of the higher species to which they are oxidised

    increasing stability of the higher species to which they are reduced

    increasing stability of the lower species to which they are oxidised.

  • Q10

    Transition metals make the most efficient catalysts because of their ability to

    adopt multiple oxidation states and to form complexes

    form coloured ions

    form a large number of oxides.

    show paramagnetism due to unpaired electrons

  • Q11

     Although zirconium belongs to 4d and hafnium to 5d-transition series even they show similar physical and chemical properties because both

    have same number of electrons

    belong to d-block

    have similar atomic radius

    belongs to the same group of the periodic table.

  • Q12

    The second and third row elements of transition metals resemble each other much more than they resemble the first row because of

    diagonal relationship between second and third row elements

    lanthanoid contraction which results in almost same radii of second and third row metals

     similar oxidation states of second and third row metals.

    similar ionisation enthalpy of second and third row elements

  • Q13

    Correct statement about W, X, Y and Z is

    Question Image

    W3+ ion is green in colour

    magnetic moment of X in its +2 oxidation state is 2.83 B.M.

    stable oxidation states of Z are +1, +2 and+6.

    Y3+ catalyses reaction between iodide and persulphate ions.

  • Q14

    Few electrode potential values are given below: On the basis of these values, Krish concluded the following statements:

    I. Cr2+ is a reducing agent

    II. Mn3+ is an oxidizing agent

    III. both Cr2+ and Mn3+ exhibit d4 electronic configuration

    IV. when Cr2+ is used as a reducing agent, the chromium ion attains d5 electronic configuration.

    The incorrect conclusion made by him is

    Question Image





  • Q15

    Use the data to answer the following and also justify giving reasons : 

    (i) Which is a stronger reducing agent in aqueous medium, Cr2+ or Fe2+ and why?

    (ii) Which is the most stable ion in +2 oxidation state and why?

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