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How would you account for the following?
Transition metals and their compounds act as catalysts.
Concept: Physical Properties of the Transition Elements (d-block)
Complete the following chemical equations :
Cu + H2SO4(conc.) →
Concept: Important Compounds of Transition Elements
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: Important Compounds of Transition Elements
The magnetic moment is associated with its spin angular momentum and orbital angular momentum. Spin only magnetic moment value of Cr3+ ion is ______.
Concept: Physical Properties of the Transition Elements (d-block)
Assertion (A): Cu cannot liberate hydrogen from acids.
Reason (R): Because it has positive electrode potential.
Concept: Physical 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: Physical Properties of the Transition Elements (d-block)
Account for the following:
Ce4+ is a strong oxidising agent.
Concept: Physical Properties of the Transition Elements (d-block)
Complete the following ionic equation:
\[\ce{Cr2O^{2-}7 + 2OH^- ->}\]
Concept: Important Compounds of Transition Elements
Which property of transition metals enables them to behave as catalysts?
Concept: Physical 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
Differentiate between adsorbtion and absorption.
Concept: Types of Adsorption
Out of MgCl2 and AlCl3, which one is more effective in causing coagulation of negatively charged sol and why?
Concept: Properties of Colloidal Solutions
Out of sulphur sol and proteins, which one form multimolecular colloids?
Concept: Purification of Colloidal Solution
Out of sulphur sol and proteins, which one form multimolecular colloids?
Concept: Purification of Colloidal Solution
For the complex [Fe(CN)6]3–, write the hybridization type, magnetic character and spin nature of the complex. (At. number : Fe = 26).
Concept: Bonding in Coordination Compounds >> Magnetic Properties of Coordination Compounds
Draw one of the geometrical isomers of the complex [Pt(en)2Cl2]2+ which is optically active.
Concept: Isomerism in Coordination Compounds >> Stereoisomerism
