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Explain the observation, at the end of each period, there is a slight increase in the atomic radius of d-block elements.
Concept: Electronic Configurations of the d-block Elements
What is the effect of pH on dichromate ion solution?
Concept: Important Compounds of Transition Elements
Give reason for the following statement:
[Ti(H2O)]3+ is coloured while [Sc(H2O)6]3+ is colourless.
Concept: Physical Properties of the Transition Elements (d-block)
The oxidation state of Fe in [Fe(CO)5] is ______.
Concept: Physical Properties of the Transition Elements (d-block)
Assertion (A): Transition metals have high enthalpy of atomisation.
Reason (R): Greater number of unpaired electrons in transition metals results in weak metallic bonding.
Concept: Physical Properties of the Transition Elements (d-block)
Which one among the following metals of the 3d series has the lowest melting point?
Concept: Physical Properties of the Transition Elements (d-block)
Which of the following transition metals shows +1 and +2 oxidation states?
Concept: Physical Properties of the Transition Elements (d-block)
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)
