Advertisements
Advertisements
Write the number of unpaired electrons in Cr3+.
(Atomic number of Cr = 24)
Concept: General Properties of the Transition Elements (D-block)
Complete the reaction mentioning all the products formed:
\[\ce{Cr2O^{2-}7 + 3H2S + 8H^+ ->}\]
Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
Account for the following:
Copper has an exceptionally positive `"E"_("M"^(2+)//"M")^0` value.
Concept: General Properties of the Transition Elements (D-block)
Account for the following:
Eu2+ with electronic configuration [Xe]4f76s2 is a strong reducing agent.
Concept: General Properties of the Transition Elements (D-block)
Match the properties with the elements of 3d series:
| (i) | lowest enthalpy of atomisation | (p) | Sc |
| (ii) | shows maximum number of oxidation states | (q) | Mn |
| (iii) | transition metal that does not form coloured compounds |
(r) | Zn |
| (s) | Ti |
Concept: Electronic Configurations of the D-block Elements
The trend of which property is represented by the following graph?
Concept: General Properties of the Transition Elements (D-block)
Which of the following ions will have a magnetic moment value of 1.73 BM.
\[\ce{Sc^3+, Ti^3+, Ti^2+, Cu^2+, Zn^2+}\]
Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals
In order to protect iron from corrosion, which one will you prefer as a sacrificial electrode, Ni or Zn? Why? (Given standard electrode potentials of Ni, Fe and Zn are -0.25 V, -0.44 V and -0.76 V respectively.)
Concept: General Properties of the Transition Elements (D-block)
The second ionization enthalpies of chromium and manganese are 1592 and 1509 kJ/mol respectively. Explain the lower value of Mn.
Concept: General Properties of the Transition Elements (D-block)
Give two similarities in the properties of Sc and Zn.
Concept: General Properties of the Transition Elements (D-block)
What is actinoid contraction?
Concept: F-block Elements >> The Actinoids
What causes actinoid contraction?
Concept: F-block Elements >> The Actinoids
What is the oxidation state of chromium in chromate ion and dichromate ion?
Concept: General Properties of the Transition Elements (D-block)
Write the ionic equation for reaction of KI with acidified KMnO4.
Concept: General Properties of the Transition Elements (D-block)
Write the formula of Tetraminodichloroplatinum (IV) chloridex.
Concept: Nomenclature of Coordination Compounds - Formulas of Mononuclear Coordination Entities
Write the IUPAC name of 
Concept: Nomenclature of Coordination Compounds - Naming of Mononuclear Coordination Compounds
Write the dispersed phase and dispersion medium of the following colloidal systems:
(i) Smoke
(ii) Milk
Concept: Catalysis >> Enzyme Catalysis
What are lyophilic and lyophobic colloids ? Which of these sols can be easily coagulated on the addition of small amounts of electrolytes?
Concept: Classification of Colloids >> Classification Based on Nature of Interaction Between Dispersed Phase and Dispersion Medium
Write the differences between physisorption and chemisorption with respect to the following:
(i) Specificity
(ii) Temperature dependence
(iii) Reversibility and
(iv) Enthalpy change
Concept: Types of Adsorption
Write the IUPAC names of the following coordination compounds: [Cr(NH3)3Cl3]
Concept: Nomenclature of Coordination Compounds - Naming of Mononuclear Coordination Compounds
