Advertisements
Advertisements
प्रश्न
Write the molecular formulae of the following compound.
Cryolite
Advertisements
उत्तर
Cryolite- Na3AlF6
APPEARS IN
संबंधित प्रश्न
Metallic oxides of zinc, magnesium and copper were heated with the following metals.
| Metal | Zinc | Magnesium | Copper |
| Zinc oxide | – | – | – |
| Magnesium oxide | – | – | – |
| Copper oxide | – | – | – |
In which cases will you find displacement reactions taking place?
How is copper extracted from its sulphide ore? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper.
In the extraction of aluminium Write the cathode reaction in electrolytic reduction of alumina.
Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?
Describe the extraction of zinc metal from its sulphide ore (zinc blende). Write equations of the reactions involved.
Which of the following is an iron ore?
(a) cinnabar
(b) calamine
(c) haematite
(d) rock salt
The major ore of aluminium is known as:
(a) cinnabar
(b) calamine
(c) bauxite
(d) pyrolusite
Which method of refining is used to get 99.8% pure aluminium?
Name:
The allotrope of the non-metal carbon which conducts electricity.
Observe the given figure of reactivity series of metals and answer the following questions:
Reactivity series of metals
- Name two metals which react with water.
- Name two moderately reactive metals.
- Name the most highly reactive metal and the most less reactive metal.
In electrolytic reduction of alumina _______ is used as a cathode.
Find the odd one out and give its explanation.
Explain the concept of Roasting.
Explain the characteristics of ionic compounds.
Explain the following reaction with the balanced equation.
Chlorine dissolved in water
Explain the following reaction with the balanced equation.
Ferric oxide is reacted with aluminium.
Explain in brief types of extraction of less reactive metals according to their reactivity.
Explain Bayer’s process of concentration of bauxite with a chemical equation.
The poorest conductor of heat among metals is ____________.
Two ores A and B were taken. On heating ore A gives CO2 whereas, ore B gives SO2. What steps will you take to convert them into metals?
