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प्रश्न
Gold and silver are active metals.
पर्याय
Right
Wrong
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उत्तर
Gold and silver are active metals- Wrong
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संबंधित प्रश्न
Name the following:
Main ore of aluminium.
In the extraction of aluminium: Why is it necessary to replace anodes time to time?
Name the most abundant metal in the earth's crust.
Name two metals which are highly resistant to corrosion.
Define the terms gangue.
Name one ore of sodium. Name the sodium compound present in this ore and write its chemical formula.
An element A which is a part of common salt and kept under kerosene reacts with another element B of atomic number 17 to give a product C. When an aqueous solution of product C is electrolysed then a compound D is formed and two gases are liberated.
(a) What are A and B?
(b) Identify C and D.
(c) What will be the action of C on litmus solution? Why?
(d) Write formula of the compound formed when element B reacts with an element E having atomic number 5.
Identify the process given in following passage and draw neat labelled diagram showing the process.
Electrolysis of molten mixture of alumina (melting point > 20000C) is done in a steel tank. The tank has a graphite lining on the inner side. This lining does the work of a cathode. A set of graphite rods dipped in the molten electrolyte works as anode. Cryolite (Na3AlF6) and fluorspar (CaF2) are added in the mixture to lower its melting point upto 10000C.
Define the following term.
Gangue
Give the chemical formula of :
Sodium aluminate
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?
Name the following:
Name two metals always find in combined state.
The following questions relate to the extraction of aluminium by electrolysis.
Explain why it is necessary to renew the anode periodically.
Complete the incomplete statement with missing word:
Metals are malleable while non-metals are ______.
Complete the incomplete statement with missing word:
Non-metals form acidic oxides while metals form ______.
Name : The metal which is liquid at room temperature.
Froth floatation process is generally used to concentrate ______ ores.
What is the difference between calcination and roasting?
Sulphide ores : Roasting : : Carbonate ores : _______
