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What are interstitial compounds?
Concept: Physical Properties of the Transition Elements (d-block)
Define lanthanoid contraction.
Concept: F-block Elements >> The Lanthanoids
Account for the following :
Zr and Hf have almost similar atomic radii.
Concept: F-block Elements >> The Lanthanoids
Complete the following equations : 2 MnO2 + 4 KOH + O2 →
Concept: Important Compounds of Transition Elements
Complete the following equations : 2 Na2CrO4 + 2 H + →
Concept: Important Compounds of Transition Elements
|
`E_((M^(2+)/M)` |
Cr | Mn | Fe | Co | Ni | Cu |
| -0.91 | -1.18 | -0.44 | -0.28 | -0.25 | -0.34 |
From the given data of E0 values, answer the following questions :
(1) Why is `E_(((Cu^(2+))/(Cu)))` value exceptionally positive
(2) Why is `E_(((Mn^(2+))/(Mn)))` value is highly negative as compared to other elements
(3) Which is the stronger reducing agents Cr2+ or Fe2+ ? Give Reason.
Concept: Physical Properties of the Transition Elements (d-block)
Why do actinoids show a wide range of oxidation states?
Concept: F-block Elements >> The Actinoids
Write on similarity between the chemistry of lanthanoids and actinoids.
Concept: F-block Elements >> The Actinoids
Explain effects of lanthanoid contraction.
Concept: F-block Elements >> The Lanthanoids
Write the formula of an oxo-anion of Manganese (Mn) in which it shows the oxidation state equal to its group number.
Concept: Important Compounds of Transition Elements
Answer the following question.
When MnO2 is fused with KOH in the presence of KNO3 as an oxidizing agent, it gives a dark green compound (A). Compound (A) disproportionates in an acidic solution to give a purple compound (B). An alkaline solution of compound (B) oxidizes KI to compound (C) whereas an acidified solution of compound (B) oxidizes KI to (D). Identify (A), (B), (C), and (D).
Concept: Important Compounds of Transition Elements
Using IUPAC norms, write the formula of potassium trioxalatochromate(III).
Concept: Important Compounds of Transition Elements
Give reasons for the following statement:
Transition metals and most of their compounds show paramagnetic behaviour.
Concept: Physical Properties of the Transition Elements (d-block)
Give reason for the following statement:
Physical and chemical properties of the 4d and 5d series of the transition elements are quite similar to expected.
Concept: Physical Properties of the Transition Elements (d-block)
Define transition metals.
Concept: Electronic Configurations of the d-block Elements
How is the variability in oxidation states of transition metals different from that of p-block elements?
Concept: Physical Properties of the Transition Elements (d-block)
Assertion (A) : Copper is a non-transition element.
Reason (R) : Copper has completely filled d-orbitals in its ground state.
Concept: Electronic Configurations of the d-block Elements
Which of the following characteristics of transition metals is associated with their catalytic activity?
Concept: Physical Properties of the Transition Elements (d-block)
When a coordination compound CoCl3.6NH3 is mixed with AgNO3, 3 moles of AgCl are precipitated per mole of the compound. Write the structural formula of the coordination compound.
Concept: Isomerism in Coordination Compounds >> Stereoisomerism
Draw the geometrical isomers of complex \[\ce{[Co(en)2Cl2]+}\].
Concept: Isomerism in Coordination Compounds >> Stereoisomerism
