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d- and f- Block Element

chemistry 12th class cbse notes

Actinoids – Properties and Uses

Actinoids The 14 elements immediately following actinium (89), with atomic numbers 90 (Thorium) to 103 (Lawrencium) are called actinoids. They belong to second inner transition...
chemistry 12th class cbse notes

Inner Transition elements (f- Block) Introduction and Lanthanoids

Inner Transition elements (f- Block) Introduction The elements in which the differentiating electron enters the penultimate energy level i.e. (n−2)f, are called f-block elements. Due...
chemistry 12th class cbse notes

Potassium Permanganate, KMnO4

Potassium Permanganate, KMnO4 Preparation of Potassium Permanganate: It is prepared by fusion of MnO4 with alkali metal hydroxide (KOH) in presence of O2 or oxidising agent...
chemistry 12th class cbse notes

Potassium dichromate, K2Cr2O7

Potassium dichromate, K2Cr2O7 Preparation of Potassium dichromate: It is prepared by fusion of chromate ore (FeCr2O4) with sodium carbonate in excess of air. Na2CrO4 produced in the...
chemistry 12th class cbse notes

Formation of oxides of d-block elements

Formation of oxides of d-block elements Transition metals form oxides on reaction with oxygen at elevated temperature. Transition metal form oxide in oxidation state of...
chemistry 12th class cbse notes

Alloy Formation in d-block elements

Alloy Formation in d-block elements Alloys are homogeneous solid solutions of two or more metals obtained by melting the components and then cooling the...
chemistry 12th class cbse notes

Formation of Coloured Ions & Catalytic Properties of d-block elements

Formation of Coloured Ions: When an electron from a lower energy d orbital is excited to a higher energy d orbital, the energy of excitation...
chemistry 12th class cbse notes

Chemical Reactivity and E0 Values

Chemical Reactivity and E0 Values: The transition metals vary very widely in their chemical reactivity. Some of them are highly electropositive and dissolve in mineral...
chemistry 12th class cbse notes

Different Trends in d-block elements

Trends in the M2+/M Standard Electrode Potentials There is no regular trend in the E0 (Mn2+/M) values. This is because their ionization enthalpies (I1...
chemistry 12th class cbse notes

d-Block elements- Introduction

“The elements in which the last differentiating electron enters into the d-orbitals of the penultimate shell i.e. (n–1) d where n is the last...