Advertisements
Advertisements
प्रश्न
Write the molecular formulae of the following compound.
Stannic oxide
Advertisements
उत्तर
Stannic oxide- SnO2
APPEARS IN
संबंधित प्रश्न
Give the importance of the following for living beings:
Hydrogen
Metal A has an electronic configuration of 2, 8, 1 and metal B has 2, 8, 8, 2 which is more reactive metal.
Identify A and B and give their reactions with dil HCL and dil H2SO4 ?
Metal A has an electronic configuration of 2, 8, 1 and metal B has 2, 8, 8, 2 which is more reactive metal.
Give the effect of heat on their ?
oxides
Metal A has an electronic configuration of 2, 8, 1 and metal B has 2, 8, 8, 2 which is more reactive metal.
Give the effect of heat on their: hydroxide
Metal A has an electronic configuration of 2, 8, 1 and metal B has 2, 8, 8, 2 which is a more reactive metal.
Give the effect of heat on their: carbonates
A student has been collecting silver coins and copper coins. One day she observed a black
coating on silver coins and a green coating on copper coins. Which chemical phenomenon is
responsible for these coatings? Write the names of black and green coatings.
Name the processes involved in refining of ores.
Explain the following terms:
(c) slag
Explain the following terms:
smelting
An ore on being heated in air forms sulphurous anhydride. Write the process used for the concentration of this ore.
state the reactions at the two electrodes ?
What is magnalium? Name the main elements present in it? Write its one use ?
Aluminium is extracted from its chief ore, bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction.
Write three balanced equations for the purification of bauxite.
In Wilfley table method to separate particles of gangue _______ method is used.
Observe the figure and name and explain in brief the following method:

The chemical name of rust is ______.
State the reason for the addition of caustic alkali to bauxite ore during the purification of bauxite.
Calculate the difference between heat of combustion of carbon monoxide gas at constant pressure and at constant volume at 27°C? (R = 2 cal K-1 mol-1).
A process of extracting metals from aqueous solutions of their salts using suitable reducing agents is called ______
Name the process that is employed to refine aluminium.
