Advertisements
Advertisements
प्रश्न
Aluminium oxide is _______ oxide.
विकल्प
acidic
basic
neutral
amphoteric
उत्तर
Aluminium oxide is amphoteric oxide.
APPEARS IN
संबंधित प्रश्न
In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte?
A zinc ore on heating in air forms sulphur dioxide. Describe briefly any two stages involved in the conversion of this concentrated ore into zinc metal.
Explain givem equation, what happens when a mixture of Cu2O and Cu2S is heated?
Explain why, an aqueous solution of sodium chloride is not used for the electrolytic extraction of sodium metal.
Name two metals which are always found in combined state.
Which metal is extracted from bauxite ore?
The articles made of silver metal become dark on prolonged exposure to air. This is due to the formation of a layer of its:
(a) oxide
(b) hydride
(c) sulphide
(d) carbonate
State three objectives achieved during the roasting of ores.
Aluminum is used in thermite welding:
what is ignition mixture?
Distinguish between ‘roasting’ and ‘calcination’. Which of these two is used for sulphide ores and why?
Identify the process given in following passage and draw neat labelled diagram showing the process.
Electrolysis of molten mixture of alumina (melting point > 20000C) is done in a steel tank. The tank has a graphite lining on the inner side. This lining does the work of a cathode. A set of graphite rods dipped in the molten electrolyte works as anode. Cryolite (Na3AlF6) and fluorspar (CaF2) are added in the mixture to lower its melting point upto 10000C.
Name the following:
The process in which an ore is heated in air so that oxygen gets added to it to form the oxides.
Define the term : Gangue
Name : The metal which is liquid at room temperature.
Complete the following by selecting the correct option from the choices given:
The metal which does not react with water or dilute H2SO4 but reacts with concentrated H2SO4 is _________
choose the most appropriate term to match the given description.
Heating of the ore in the absence of air to high temperature
Define roasting.
In Electrolytic reduction of alumina, Anode : _______ : : Cathode : Graphite lining
Write the name.
Metals which are amphoteric in nature.
Write the molecular formulae of the following compound.
Sodium aluminate
