Advertisements
Advertisements
Question
Write the molecular formulae of the following compound.
Sodium aluminate
Advertisements
Solution
Sodium aluminate- NaAlO2
APPEARS IN
RELATED QUESTIONS
In the extraction of aluminium: Name the process of concentration of bauxite.
Name the most abundant metal in the earth's crust.
Why does aluminium not corrode right through?
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
The two metals which can be extracted just by heating their sulphides in air are:
(a) sodium and copper
(b) copper and aluminium
(c) potassium and zinc
(d) mercury and copper
Which of the following is an ore of mercury metal?
(a) rock salt
(b) cinnabar
(c) calamine
(d) haematite
During galvanisation, iron metal is given a thin coating of one of the following metals. This metal is:
(a) chromium
(b) tin
(c) zinc
(d) copper
The metal which can be extracted from pyrolusite ore is:
(a) mercury
(b) manganese
(c) aluminium
(d) magnesium
State three objectives achieved during the roasting of ores.
Give the chemical formula of :
Cryolite
Name the ore of mercury. With the help of balanced chemical equations, explain the process of extraction of mercury from its ore.
What is meant by concentration of ores?
What is passive iron?
Name:
The allotrope of the non-metal carbon which conducts electricity.
Atomic number of aluminium is _______ and its electronic configuration is _______.
Gold and silver are active metals.
Explain the following reaction with the balanced equation.
Zinc carbonate is heated strongly in limited supply of air
Complete flow chart given below.

During extraction of metals, electolytic refining is used to obtain pure metals.
(a) Which material will be used as anode and cathode for refining of silver metal by this process?
(b) Suggest a suitable electrolyte also.
(c) In this electrolytic cell, where do we get pure silver after passing electric current?
On the basis of reactivity metals are grouped into three categories:
- Metals of low reactivity
- Metals of medium reactivity
- Metals of high reactivity
Therefore metals are extracted in pure form from their ores on the basis of their chemical properties.
Metals of high reactivity are extracted from their ores by electrolysis of the molten ore.
Metals of low reactivity are extracted from their sulphide ores, which are converted into their oxides. The oxides of these metals are reduced to metals by simple heating.
(a) Name the process of reduction used for a metal that gives vigorous reaction with air and water both.
(b) Carbon cannot be used as a reducing agent to obtain aluminium from its oxide? Why?
(c) Describe briefly the method to obtain mercury from cinnabar. Write the chemical equation for the reactions involved in the process.
OR
(c) Differentiate between roasting and calcination giving chemical equation for each.
