Metallurgy
Name two ores of Iron
Hematite and Magnetite
What is observed when a glass rod dipped in HCl is brought near ammonia gas?
Dense white fumes are observed
The gas evolved when cold dilute nitric acid reacts with manganese
Hydrogen
Why are flurospar and cryolite added to the mixture for electrolytic reducation ?
To enhance the mobility of ions and to lower the fusion temperature
What are the inferences of the Fountain Experiment?
Ammonia is highly soluble in water. It is basic in nature
When Bengal Salt petre reacts with conc. sulphuric acid at 180 oC________ is formed.
Potassium bisulphate
Define Ore. Name the ore of Zinc
The minerals from which metals are extracted commercially at a comparatively low cost and with minimum effort are called ores.
Zinc blende & Calamine
Give the reaction for lab preparation of ammonia using ammonium salt. Name the drying agent used
Ca(OH)2 + 2NH4Cl ->CaCl2 + 2H2O + 2NH3
Calcium oxide is used as drying agent.
Observation when :
Nitric acid is added to sawdust.
Conc. nitric acid is added to Copper
Sawdust burst into flames.
Reddish brown fumes are evolved.
Name the process for purification of Bauxite.Give the balanced chemical equations for it
Baeyer's process
State any 2 uses of ammonia. Explain why it is used.
Ammonia is used as cleaning agent as it dissolves grease.
Liquid ammonia is used as refrigerant
Nitric acid cannot be concentrated beyond 68% by the distillation of dilute solution of HNO3. State the reason.
Nitric acid forms a constant boiling mixture with water containing 68% acid. This mixture boils constantly at constant boiling point without any change in its composition. At this temperature, the gas and the water vapour escape together.
Name the process used for Electrolytic reduction of Alumina. Also give the electrolytic reaction. Product at each electrode.
Hall Heroult's Process.
Al2O3 <=>2 Al3+ +3 O 2-
Anode : Oxygen
Cathode : Pure Aluminium
Name the Method of Industrial Preparation of Ammonia.
Name the catalyst used.
Give the equation.
Haber's Process
Finely divided iron
3H2 + N2 <=>2NH3(temp 450 to 500, pressure 200-900 atm)
Process for Large scale preparation of Nitric acid.
The Equations for the process.
Ostwald's Process
1. 4NH3 + 5O2 -> 4NO +6H2O (Pt,800oC)
2. 2NO + O2 ->2NO2
3.4NO2 + 2H2O + O2 -> 4HNO3