Advertisements
Advertisements
प्रश्न
What is the role of cryolite in the extraction of aluminium?
Advertisements
उत्तर
The function of the cryolite is to lower the fusion temperature from 2050°C to 950°C and to enhance conductivity.
APPEARS IN
संबंधित प्रश्न
Write the names and chemical formulae of any one ore of zinc.
Indicate the principle behind the method used for the refining of zinc.
What is 'copper matte' ?
Metals which occur in their native state in nature:
Metal which is found in free state is:
Which of the following reactions occur during calcination?
(i) \[\ce{CaCo3 -> CaO + CO2}\]
(ii) \[\ce{2FeS2 + 11/2 O2 -> Fe2O3 + 4SO2}\]
(iii) \[\ce{Al2O3. {x}H2O -> Al2O3 + {x}H2O}\]
(iv) \[\ce{ZnS + 3/2 O2 -> ZnO + SO2}\]
Metal always found in Free State is
Native silver metal forms a water solution complex with dilute solution of Na CN in the presence of
Match List - I with List - II.
| List - I | List - II | ||
| (One) | (Composition) | ||
| (A) | Siderite | (I) | FeCO3 |
| (B) | Malachite | (II) | CuCO3 · Cu(OH)2 |
| (C) | Sphalerite | (III) | ZnS |
| (D) | Calamine | (IV) | ZnCO3 |
Choose the correct answer from the options given below:
Calamine and Malachite, respectively, are the ores of ______.
