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प्रश्न
Select the process from the following which matches the given description.
(calcination, roasting, pulverisation, smelting)
Heating of the ore in the absence of air to a high temperature.
उत्तर
Heating of the ore in the absence of air to a high temperature that is high but insufficient to melt the ore is known as calcination
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संबंधित प्रश्न
Complete the statement using every given option.
During the extraction of aluminium..............
Use of leaching during the concentration of ore.
Name the following :
Ore of iron referred to as "fool's gold".
Give reason for the following:
Zinc is used in galvanization and dry cells.
Complete and balance the following equation :
Al + NaOH →
Give the name and formula of an ore of zinc.
Reduction of the zinc compound which is the product of above reaction.
Give the name and formula of an ore of zinc.
What in addition to a zinc compound, is put into the furnace? State one large scale use of zinc.
What is an alloy? An alloy usually has some property which makes it useful in a specific way.
What is the special property of : type metal?
From the metals copper, iron, magnesium, sodium and zinc, select a different metal in each case which:
(a) Does not react with dilute hydrochloric acid
(b) Can form 2+ and 3+ ions
(c) Has a hydroxide that reacts with both acid and alkalis.
(d) Does not react with cold water, but reacts with steam when heated.
A to F below relate to the source and extraction of either zinc or aluminium.
- Bauxite
- Coke
- Cryolite
- Froth floatation
- Sodium hydroxide solution
- Zinc blende
Write the formula of cryolite.
Draw diagram of magnetic separation process and answer the questions based on it.
- Give example in which this process can work.
- Suggest any two methods that can also be used for this purpose.
- Which technique is based on hydrophobic and hydrophilic properties of particles?
