Some Important Compounds Of Transition Elements
Chapter Name : The D- And F- Block Elements |
Sub Topic Code : 102_12_08_04_01 |
Topic Name : Some Important Compounds Of Transition Elements |
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Sub Topic Name : Some Important Compounds Of Transition Elements |
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Introduction
• These oxides are generally formed by the reaction of metals with oxygen at high temperatures. All the metals except scandium form MO oxides which are ionic. • Beyond group 7, no higher oxides of iron above Fe2O3 are known. Besides the oxides, the oxocations stabilise VV as VO2+, VIV as VO2+ and TiIV as TiO2+. • As the oxidation number of a metal increases, ionic character decreases. • Potassium dichromate is a very important chemical used in leather industry and as an oxidant for preparation of many azo compounds. • Sodium dichromate is more soluble than potassium dichromate. The latter is therefore, prepared by treating the solution of sodium dichromate with potassium chloride. • Potassium permanganate is prepared by fusion of MnO2 with an alkali metal hydroxide and an oxidising agent like KNO3.
Pre-Requisites:
Periodic table, elements,
Activity:
• Potassium dichromate is a very important chemical used in leather industry and as an oxidant for preparation of many azo compounds.
Real Life Question:
What oxide of transition metal is issued in the leather industry?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| group | Group is the vertical column on the periodic table which contains elements having the similar properties. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|
Real life uses :
• Potassium dichromate is a very important chemical used in leather industry and as an oxidant for preparation of many azo compounds.
Places to visit :
Leather industry.
Practical examples around us
| Examples | Explainations |
|---|---|
| Potassium dichromate | • Potassium dichromate is a very important chemical used in leather industry and as an oxidant for preparation of many azo compounds. |
What you learn in Theory:
• These oxides are generally formed by the reaction of metals with oxygen at high temperatures. All the metals except scandium form MO oxides which are ionic. • Beyond group 7, no higher oxides of iron above Fe2O3 are known. Besides the oxides, the oxocations stabilise VV as VO2+, VIV as VO2+ and TiIV as TiO2+. • As the oxidation number of a metal increases, ionic character decreases. • Potassium dichromate is a very important chemical used in leather industry and as an oxidant for preparation of many azo compounds. • Sodium dichromate is more soluble than potassium dichromate. The latter is therefore, prepared by treating the solution of sodium dichromate with potassium chloride. • Potassium permanganate is prepared by fusion of MnO2 with an alkali metal hydroxide and an oxidising agent like KNO3.
What you learn in Practice:
• Oxides of transition metals are formed by the reaction of metals with oxygen at high temperature.