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Name a member of the lanthanoid series which is well known to exhibit +4 oxidation state.
Concept: F-block Elements >> The Lanthanoids
Out of Mn3+ and Cr3+, which is more paramagnetic and why ?
(Atomic nos. : Mn = 25, Cr = 24)
Concept: General Properties of the Transition Elements (D-block)
Complete the following chemical equation
Cr2O72- + 3Sn2+ + 14H+ →
Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
Explain why Cu+ ion is not stable in aqueous solutions?
Concept: General Properties of the Transition Elements (D-block)
How is the variability in oxidation states of transition metals different from that of the non-transition metals? Illustrate with examples.
Concept: General Properties of the Transition Elements (D-block)
Indicate the steps in the preparation of KMnO4 from pyrolusite ore.
Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
How would you account for the following?
Transition metals and their compounds act as catalysts.
Concept: General Properties of the Transition Elements (D-block)
Complete the following chemical equations :
Cu + H2SO4(conc.) →
Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
Name the elements of 3d transition series that show maximum number of oxidation states. Why does this happen?
Concept: Electronic Configurations of the D-block Elements
Which transition metal of 3d series has positive E° (M2+/M) value and why?
Concept: Electronic Configurations of the D-block Elements
Out of Cr3+ and Mn3+, which is a stronger oxidising agent and why?
Concept: Electronic Configurations of the D-block Elements
Name a member of the lanthanoid series that is well-known to exhibit +2 oxidation state.
Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
The magnetic moment is associated with its spin angular momentum and orbital angular momentum. Spin only magnetic moment value of \[\ce{Cr^{3+}}\] ion is ______.
Concept: General Properties of the Transition Elements (D-block)
Assertion (A): Cu cannot liberate hydrogen from acids.
Reason (R): Because it has positive electrode potential.
Concept: General Properties of the Transition Elements (D-block)
Name the element of 3d series which exhibits the largest number of oxidation states. Give reason.
Concept: Electronic Configurations of the D-block Elements
Why Zn, Cd and Hg are not called transition metals?
Concept: General Properties of the Transition Elements (D-block)
Account for the following:
Ce4+ is a strong oxidising agent.
Concept: General Properties of the Transition Elements (D-block)
Complete the following ionic equation:
\[\ce{Cr2O^{2-}7 + 2OH^- ->}\]
Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
Which property of transition metals enables them to behave as catalysts?
Concept: General Properties of the Transition Elements (D-block)
On adding NaOH to ammonium sulphate, a colourless gas with pungent odour is evolved, which forms a blue-coloured complex with Cu2+ ion. Identify the gas.
Concept: Bonding in Coordination Compounds >> Colour in Coordination Compounds
