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प्रश्न
Iron is _______.
विकल्प
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
How many carats is pure gold? Why is pure gold not suitable for making ornaments?
What is meant by the 'concentration of ore'?
Name the metal which is extracted from haematite ore.
Which of the following metals can be obtained from haematite ore?
(a) copper
(b) sodium
(c) zinc
(d) iron
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
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Why is powdered coke sprinkled on top of the electrolyte?
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Name the electrode, from which aluminium collected.
Name the following:
The substance added to get rid of gangue in the extraction of metal.
Name the following:
The process in which an ore is heated in air so that oxygen gets added to it to form the oxides.
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 ______.
Name a non- metal that has a metallic luster and sublimes on heating.
Zinc blende is converted to oxide by ______ process.
In Electrolytic reduction of alumina, Anode : _______ : : Cathode : Graphite lining
Find the odd one out and give its explanation.
Write the name.
Metals which are amphoteric in nature.
Gold and silver are active metals.
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?
Electrical wires have a coating of an insulting material. The material, generally used is
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?
