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प्रश्न
Extraction of moderately reactive elements is done by _______ and _______ method.
पर्याय
roasting and calcination
roasting and reduction
separation and calcination
none of these
उत्तर
Extraction of moderately reactive elements is done by roasting and calcination method.
संबंधित प्रश्न
In the extraction of aluminium: Name the process of concentration of bauxite.
Name a reducing agent that may be used to obtain manganese from manganese dioxide.
Name two metals which are highly resistant to corrosion.
Fill in the following blank with suitable word:
Bronze is an alloy of copper and .........
Calamine ore can be used to extract one of the following metals. This metal is:
(a) copper
(b) mercury
(c) aluminium
(d) zinc
The metal which is always present in an amalgam is:
(a) iron
(b) aluminium
(c) mercury
(d) magnesium
Rock salt is an ore of one of the following metals. This metal is:
(a) Mn
(b) Na
(c) Fe
(d) Cu
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?
Define the following term.
Gangue
Name the ore of mercury. With the help of balanced chemical equations, explain the process of extraction of mercury from its ore.
Name:
The allotrope of the non-metal carbon which conducts electricity.
Froth floatation process is generally used to concentrate ______ ores.
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.
Write the molecular formulae of the following compound.
Cryolite
Explain the following reaction with the balanced equation.
Sodium aluminate reacts with water
Which of the statements about the reaction, \[\ce{ZnO + CO -> Zn + CO2}\] is correct?
Which of the following ore is concentrated by the Froth floatation process?
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?
Care must be taken while diluting concentrated nitric acid with water. Why?
