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प्रश्न
Iron is _______.
पर्याय
more reactive than zinc
more reactive than aluminium
less reactive than copper
less reactive than aluminium
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उत्तर
Iron is less reactive than aluminium.
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संबंधित प्रश्न
Name one metal which is extracted by electrolytic reduction.
How is manganese extracted from manganese dioxide, MnO2? Explain with the help of an equation.
How is zinc extracted from its carbonate or (calamine)? Explain with equations.
Name two metals which occur in nature in free state as well as in combined state.
Name one ore of copper (other than cuprite). Which compound of copper is present in this ore? Also, write its chemical formula.
Name three other metals which are extracted in a manner similar to sodium.
Name one ore of mercury. Which mercury compound is present in this ore? 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
The two metals which are extracted by means of electrolytic reduction of their molten salts are:
(a) magnesium and manganese
(b) iron and aluminium
(c) zinc and magnesium
(d) magnesium and aluminium
Distinguish between ‘roasting’ and ‘calcination’. Which of these two is used for sulphide ores and why?
Give the chemical formula of :
Bauxite
Give the chemical formula of :
Sodium aluminate
Name the following:
Name two metals always find in combined state.
X is an element in the form of a powder. X burns in oxygen and the product is soluble in water. The solution is tested with litmus. Write down only the word which will correctly complete each of the following sentences:
(a) If X is a metal, then the litmus will turn ______.
(b) If X is a non-metal, then the litmus will turn ______.
(c) If X is a reactive metal, then ______ will be evolved, when X reacts with dilute sulphuric acid.
(d) If X is a non -metal, it will form _ oxide, which will form ______ solution with water.
(e) If X is a non -metal, it will not conduct electricity unless it is carbon in the form of ______.
Carbon cannot reduce the oxides of sodium, magnesium, and aluminum to their respective metals. Why? Where are these metals placed in the reactivity series? How are these metals obtained from their ores? Take an example to explain the process of extraction along with chemical equations.
Gold and silver are active metals.
Complete flow chart given below.
Observe the following diagram and write answers.
- Name the method.
- Write anode reaction and cathode reaction.
- Why fluorspar and cryolite are added in the mixture?
Explain in brief types of extraction of moderately reactive metals according to their reactivity.
Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?
