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Write balanced chemical equations for the conversion of `CrO_4^(2-)` to `Cr_2O_7^(2-)` in acidic medium and `Cr_2O_7^(2-)` to `CrO_4^(2-)`
in basic medium.
Concept: Physical Properties of the Transition Elements (d-block)
Oxidation states of scandium are ___________.
Concept: The d-Block Elements (Transition Elements) >> General Indroduction
How is potassium dichromate prepared from chrome iron ore?
Concept: Physical Properties of the Transition Elements (d-block)
Explain the position of actinoids in the periodic table.
What is the action of sulphur on lanthanoids? Calculate the magnetic moment of divalent ion in aqueous solution it its atomic number is 24.
Concept: The d-Block Elements (Transition Elements) >> General Indroduction
What are 'd' and 'f' block elements?
Concept: The d-Block Elements (Transition Elements) >> General Indroduction
Why do the d-block elements form coloured compounds?
Concept: The d-Block Elements (Transition Elements) >> Some Important Compounds of Transition Elements
The compounds of \[\ce{Ti^4+}\] ions are colourless due to ______.
Concept: Physical Properties of the Transition Elements (d-block)
What are f-block elements?
Concept: F-block Elements >> General Indroduction
What are chemical twins? Write ‘two’ examples.
Concept: F-block Elements >> The Lanthanoids
What are lanthanoids?
Concept: F-block Elements >> The Lanthanoids
Which among the following pairs of elements is 'not' an example of chemical twins?
Concept: F-block Elements >> The Lanthanoids
Write the different oxidation states of iron
Concept: F-block Elements >> The Lanthanoids
Explain, why lanthanum (Z = 57) forms La3+ ion, while cerium (Z = 58) forms Ce4+ ion?
Concept: F-block Elements >> The Lanthanoids
What are the consequences of lanthanoid contraction?
Concept: F-block Elements >> The Lanthanoids
What is the position of actinoids in periodic table ?
Concept: F-block Elements >> The Actinoids
What is the action of the following on lanthanoids?
a. water
b. Sulphur, heat
c. nitrogen, heat
Concept: F-block Elements >> The Lanthanoids
Manganese in the +2 oxidation state is more stable than +3 oxidation state where as iron is stable at +3 oxidation state than +2 oxidation state. Explain why?
Concept: F-block Elements >> The Actinoids
Illustrate with example, the difference between a double salt and a co-ordination compound
Concept: Concept of Coordination Compounds >> Introduction
Which of the following complexes will give a white precipitate on treatment with a solution of barium nitrate?
- [Cr(NH3)4SO4] Cl
- [Co(NH3)4Cl2] NO2
- [Cr(NH3)4Cl2]SO4
- [CrCl2(H2O)4]Cl
Concept: Bonding in Coordination Compounds >> Colour in Coordination Compounds
On the basis of valence bond theory explain the nature of bonding in [CoF6]3 ion.
Concept: Bonding in Coordination Compounds >> Valence Bond Theory (VBT)
