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Assertion (A): Transition metals show their highest oxidation state with oxygen.
Reason (R): The ability of oxygen to form multiple bonds to metals.
Concept: Physical Properties of the Transition Elements (d-block)
In the two tetrahedral structures of dichromate ion, ______.
Concept: Important Compounds of Transition Elements
Complete the following reaction and justify that it is a disproportionation reaction:
\[\ce{3MnO^{2-}4 + 4H^+ -> \underline{}\underline{}\underline{}\underline{} + \underline{}\underline{}\underline{}\underline{} + 2H2O}\]
Concept: Physical Properties of the Transition Elements (d-block)
The given graph shows the trends in melting points of transition metals:
Explain the reason why Cr has the highest melting point and manganese (Mn) has a lower melting point.
Concept: Physical Properties of the Transition Elements (d-block)
Consider the following standard electrode potential values:
\[\ce{Fe^{3+}_{ (aq)} + e^- -> Fe^{2+}_{ (aq)}}\], E0 = +0.77 V
\[\ce{MnO^{-4}_{ (aq)} + 8H^+ + 5e^- -> Mn^{2+}_{ (aq)} + 4H2O_{(l)}}\], E0 = +1.51 V
What is the cell potential for the redox reaction?
Concept: Physical Properties of the Transition Elements (d-block)
Which of the following ions has the electronic configuration 3d6?
(Atomic number: Mn = 25, Co = 27, Ni = 28)
Concept: Physical Properties of the Transition Elements (d-block)
A transition element X has an electronic configuration [Ar]4s23d3. Predict its likely oxidation states.
Concept: Physical Properties of the Transition Elements (d-block)
Complete the reaction mentioning all the products formed:
\[\ce{2KMnO4 ->[\Delta]}\]
Concept: Important Compounds of Transition Elements
Consider the following standard electrode potential values:
\[\ce{Sn^{2+}_{ (aq)} + 2e^- -> Sn_{(s)}}\]; E0 = −0.14 V
\[\ce{Fe^{3+}_{ (aq)} + e^- -> Fe^{2+}_{ (aq)}}\]; E0 = +0.77 V
What is the cell reaction and potential for the spontaneous reaction that occurs?
Concept: Physical Properties of the Transition Elements (d-block)
Write the number of unpaired electrons in Cr3+.
(Atomic number of Cr = 24)
Concept: Physical Properties of the Transition Elements (d-block)
Complete the reaction mentioning all the products formed:
\[\ce{Cr2O^{2-}7 + 3H2S + 8H^+ ->}\]
Concept: Important Compounds of Transition Elements
Account for the following:
Copper has an exceptionally positive `"E"_("M"^(2+)//"M")^0` value.
Concept: Physical Properties of the Transition Elements (d-block)
Account for the following:
Eu2+ with electronic configuration [Xe]4f76s2 is a strong reducing agent.
Concept: Physical Properties of the Transition Elements (d-block)
Match the properties with the elements of 3d series:
| (i) | lowest enthalpy of atomisation | (p) | Sc |
| (ii) | shows maximum number of oxidation states | (q) | Mn |
| (iii) | transition metal that does not form coloured compounds |
(r) | Zn |
| (s) | Ti |
Concept: Electronic Configurations of the d-block Elements
The trend of which property is represented by the following graph?
Concept: Physical Properties of the Transition Elements (d-block)
Which of the following ions will have a magnetic moment value of 1.73 BM.
\[\ce{Sc^3+, Ti^3+, Ti^2+, Cu^2+, Zn^2+}\]
Concept: Important Compounds of Transition Elements
In order to protect iron from corrosion, which one will you prefer as a sacrificial electrode, Ni or Zn? Why? (Given standard electrode potentials of Ni, Fe and Zn are -0.25 V, -0.44 V and -0.76 V respectively.)
Concept: Physical Properties of the Transition Elements (d-block)
The second ionization enthalpies of chromium and manganese are 1592 and 1509 kJ/mol respectively. Explain the lower value of Mn.
Concept: Physical Properties of the Transition Elements (d-block)
Give two similarities in the properties of Sc and Zn.
Concept: Physical Properties of the Transition Elements (d-block)
What is actinoid contraction?
Concept: F-block Elements >> The Actinoids
