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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: Physical 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: Important Compounds of Transition Elements
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: Physical 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: Physical Properties of the Transition Elements (d-block)
Give two similarities in the properties of Sc and Zn.
Concept: Physical 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: Physical Properties of the Transition Elements (d-block)
Write the ionic equation for reaction of KI with acidified KMnO4.
Concept: Physical Properties of the Transition Elements (d-block)
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: Purification of Colloidal Solution
What are lyophilic and lyophobic colloids ? Which of these sols can be easily coagulated on the addition of small amounts of electrolytes?
Concept: Purification of Colloidal Solution
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
The complex ion `[Co(H_2O)_5 (ONO)]^(2+) `
(A) linkage isomer
(B) ionisation isomer
(C) co-ordination isomer
(D) geometrical isomer
Concept: Isomerism in Coordination Compounds >> Structural Isomerism
For the complex [Fe(H2O)6]+3, write the hybridisation, magnetic character and spin 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 inactive
Concept: Isomerism in Coordination Compounds >> Stereoisomerism
Define the following terms: Lyophilic colloid
Concept: Purification of Colloidal Solution
Define the following terms: Lyophilic colloid
Concept: Purification of Colloidal Solution
Define the following terms: Associated colloids
Concept: Properties of Colloidal Solutions
