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...
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...
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...
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...
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...
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...
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...
The Transition Elements (d-Block) – General Properties
Properties of d-Block elements:
Atomic Radii of d-Block elements:
The atomic radii of the transition metals lie in-between those of s- and...
Uses of inert gases
Helium is used:
Gas cooled Nuclear reactors
In filling balloons for meteorological observations.
In the...
Xenon-oxygen compounds
Xenon-oxygen compounds
Xenon forms some important compounds with oxygen like XeO3, XeOF4 XeO2F2.
Preparation of Xenon-oxygen compounds:
Various xenon-oxygen compounds are prepared as follows:
Partial Hydrolysis XeOF4
Partial Hydrolysis...